core services ebook chapter 3 preventive maintenance.pdf
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Core Services eBook Chapter 3 Preventive MainteTRANSCRIPT
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EmersonNetworkPower.com
What You Need to Know About Your Critical Infrastructure
Liebert Services eBook Series
Executive Summary
What is Preventive Maintenance?
Why is Preventive Maintenance Important?
What is the Return on Investment for Preventive Maintenance?
Preventive Maintenance and Power
How Often is Preventive Maintenance for Power Needed?
Preventive Maintenance Checklist for Power
Batteries are Important to Your UPS
Preventive Maintenance and Cooling
How Often is Preventive Maintenance for Cooling Needed?
Preventive Maintenance Checklist for Cooling
When to Get a Professional Involved
Conclusion
Chapter Three Preventive Maintenance
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PG 2
Chapter Three Preventive Maintenance
Executive SummaryIn our last chapter, we addressed some of the specific issues data center managers face in their
facility, and highlighted how testing and assessments can prepare them to respond, identify
risks, and improve operations. In this chapter, we address preventive maintenance, and discuss
why it is critically important to a data center.
What is Preventive Maintenance?In our previous chapter, we discussed how testing and assessments can help data center
managers avoid issues that might compromise efficiency, optimization and availability in
their facilities, but in reality, testing and assessments is just part of the solution preventive
maintenance is also a critical component of every data center.
Preventive maintenance is used to ensure maximum reliability of data center equipment by
providing systematic inspections, detection and correction of incipient failures, either before
they occur or before they develop into major defects that result in costly downtime. Preventive
maintenance can include activities such as inspections, tests, measurements, adjustments, parts
replacement, and general housekeeping practices.
Continue. . .
Executive Summary
What is Preventive Maintenance?
Why is Preventive Maintenance Important?
What is the Return on Investment for Preventive Maintenance?
Preventive Maintenance and Power
How Often is Preventive Maintenance for Power Needed?
Preventive Maintenance Checklist for Power
Batteries are Important to Your UPS
Preventive Maintenance and Cooling
How Often is Preventive Maintenance for Cooling Needed?
Preventive Maintenance Checklist for Cooling
When to Get a Professional Involved
Conclusion
Preventive maintenance is a critical factor in data center performance.
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PG 3
Why is Preventive Maintenance Important?As organizations become increasingly dependent on data center systems, there is a need for
greater reliability in the critical infrastructure and the reliability of a system only lasts as long
as the shortest component life in the unit. Preventive maintenance is critical for minimizing
unit-related failures, maintaining system cooling efficiencies, and managing operating costs.
Chapter Three Preventive Maintenance
Continue.. .
Executive Summary
What is Preventive Maintenance?
Why is Preventive Maintenance Important?
What is the Return on Investment for Preventive Maintenance?
Preventive Maintenance and Power
How Often is Preventive Maintenance for Power Needed?
Preventive Maintenance Checklist for Power
Batteries are Important to Your UPS
Preventive Maintenance and Cooling
How Often is Preventive Maintenance for Cooling Needed?
Preventive Maintenance Checklist for Cooling
When to Get a Professional Involved
Conclusion
Kevin McCalla, Vice President of Marketing, Liebert Services,
answers IT preventive maintenance questions in this video.
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Emerson Network Power | What You Need to Know About Your Critical Infrastructure
EmersonNetworkPower.com
What is the Return on Investment of Preventive Maintenance?The number of preventive maintenance visits in a data center has a substantial impact on
system reliability and less downtime and that translates into direct savings for data center
managers.
The return on investment for preventive maintenance can be observed by calculating the
Mean Time Between Failure (MTBF). MTBF is an industry recognized measure of availability
that uses the number and types of failures that products actually experience in real applications.
In general, a higher MTBF number, stated in hours, indicates a more available unit. For example,
a UPS unit with an MTBF of 2 million hours is more available than a unit with an MTBF of
1 million hours.
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The Business Case for Regular Maintenance
Number of Annual Preventive Maintenance Visits
0 1 2 3 4
60x increase in MTBF
50x
40x
30x
20x
10x
reventi
2
23x
Number of A
1
Annual P
10x
tenance
3
ive Maint
37x
4
60x in
50x
40x
30x
20x
10x
e Visits
51x
Increase in Mean Time Between Failures
Regular preventive maintenance increases the mean time between failures (MTBF).
For instance, the mean time between failures for a system that receives 1 annual PM is 10 times greater than a system that receives 0 PMs.
By contrast, a system that receives 4 annual PMs, as opposed to 0 PMs, increases its duration between failures by 51 times.
1 Data is based on Mean Time Between Failure analysis for three phase UPS systems ( 100kVA) with a service agreement between 2002-2007.
1x
Chapter Three Preventive Maintenance
Continue.. .Regular preventive maintenance increases the MTBF. For example, the MTBF for a system that receives one annual preventive maintenance visit is ten times greater than a system that receives
zero preventive maintenance visits. By contrast, a system that receives four annual preventive
maintenance visits, as opposed to zero visits, increases its duration between failures by 51 times.
Two key statistics are incorporated into MTBF; cumulative operating hours and number of
unit-related failures, to calculate average availability across all units in a given population.
The formula is as follows:cumulative operating hours
number of outages + 1MTFB =
Number of Annual Preventive Maintenance Visits
Data is based on a Mean Time Between Failure analysis for three-phase UPS
systems (>100kVA) with a service agreement between 2002-2007.
Executive Summary
What is Preventive Maintenance?
Why is Preventive Maintenance Important?
What is the Return on Investment for Preventive Maintenance?
Preventive Maintenance and Power
How Often is Preventive Maintenance for Power Needed?
Preventive Maintenance Checklist for Power
Batteries are Important to Your UPS
Preventive Maintenance and Cooling
How Often is Preventive Maintenance for Cooling Needed?
Preventive Maintenance Checklist for Cooling
When to Get a Professional Involved
Conclusion
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PG 5
Preventive Maintenance and PowerFor many organizations, the IT infrastructure has evolved into an interdependent business-critical
network that includes data, applications, storage, servers and networking. A power failure at any
point along the network can impact the entire operation and have serious consequences for
the business.
To keep running through power outages, utility spikes and other unforeseeable power issues, critical
systems are dependent on the reliability of the Uninterruptible Power Supply (UPS) systems.
UPS systems are designed to offer the utmost reliability and performance, but in reality, failures
still occur. Data center managers who are proactive with preventive maintenance will greatly
reduce their chances of downtime.
Preventive maintenance programs maximize the reliability and performance of the UPS systems
by providing systematic inspections, detection and correction of incipient failures.
Chapter Three Preventive Maintenance
Continue.. .
Executive Summary
What is Preventive Maintenance?
Why is Preventive Maintenance Important?
What is the Return on Investment for Preventive Maintenance?
Preventive Maintenance and Power
How Often is Preventive Maintenance for Power Needed?
Preventive Maintenance Checklist for Power
Batteries are Important to Your UPS
Preventive Maintenance and Cooling
How Often is Preventive Maintenance for Cooling Needed?
Preventive Maintenance Checklist for Cooling
When to Get a Professional Involved
Conclusion
Liebert NXL color touch screen display allows the users to view needed
operational information.
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Check power capacitors for swelling or
leaking oil and DC capacitor vent caps
that have extruded more than 1/8.
Record all voltage and current meter
readings on the module control cabinet
or the system control cabinet.
Measure and record harmonic trap filter
currents.
Check all breakers, temperature,
connections, and associated controls.
Repair and/or report all high temperature areas.
Complete visual inspection of the
equipment including subassemblies, wiring
harnesses, contacts, cables, and major
components.
Check air filters for cleanliness.
Check module(s) completely for rectifier and
inverter snubber boards for discoloration.
Semi-Annual Service
Power equipment should be inspected one or two times annually.
Typical tasks performed during a Semi-Annual service visit include:
PG 6
How Often is Preventive Maintenance for Power Needed?The frequency of preventive maintenance depends on the type of UPS. Small UPS devices should
be inspected annually, but medium and large systems should be inspected at least twice a year,
sometimes more. Below is a checklist for semi-annual and annual preventive maintenance service.
Chapter Three Preventive Maintenance
Continue.. .
Executive Summary
What is Preventive Maintenance?
Why is Preventive Maintenance Important?
What is the Return on Investment for Preventive Maintenance?
Preventive Maintenance and Power
How Often is Preventive Maintenance for Power Needed?
Preventive Maintenance Checklist for Power
Batteries are Important to Your UPS
Preventive Maintenance and Cooling
How Often is Preventive Maintenance for Cooling Needed?
Preventive Maintenance Checklist for Cooling
When to Get a Professional Involved
Conclusion
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PG 7
Chapter Three Preventive Maintenance
Annual Service
Typical tasks performed during an annual service typically include all the tasks performed
during a semi-annual visit plus the following:
Check inverter and rectifier snubbers for burned or broken wires.
Ensure all nuts, bolts, screws, and connectors for tightness and heat discoloration.
Verify fuses on the DC capacitor deck for continuity (if applicable).
With customer approval, perform operational test of the system including unit transfer
and battery discharge.
Check and record all electronics and bring to system specifications as needed.
Install or perform any Engineering Field Change Notices (FCN) as needed.
Measure and record all low-voltage power supply levels.
Measure and record phase-to-phase input voltage and currents.
Review system performance with customer to address any questions and to schedule repairs.
Continue. . .
Executive Summary
What is Preventive Maintenance?
Why is Preventive Maintenance Important?
What is the Return on Investment for Preventive Maintenance?
Preventive Maintenance and Power
How Often is Preventive Maintenance for Power Needed?
Preventive Maintenance Checklist for Power
Batteries are Important to Your UPS
Preventive Maintenance and Cooling
How Often is Preventive Maintenance for Cooling Needed?
Preventive Maintenance Checklist for Cooling
When to Get a Professional Involved
Conclusion
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Preventive Maintenance Checklist for Power What are Service Providers Evaluating?
Some common preventive maintenance checks should include:
Power Semiconductors During an annual preventive maintenance cycle, semiconductor
devices should be visually inspected for corrosion and breaks to the hermetic seal. If corrosion
or seal damage is found, the device should be replaced.
Electrolytic DC Capacitors Experience proves that capacitors should be replaced significantly
before the end of their rated service life. This helps account for variations in ambient temperature,
air-borne contaminants and other environmental factors.
Oil-Filled AC Capacitors As oil-filled capacitors approach their design life, they are subject to
the internal breakdown of the soggy foils and possible loss of capacitance. Its recommended that all
oil-filled capacitors be inspected and those within six months of their expected life should be replaced.
Circuit Boards There is no rated service life on the components
specified for use on the circuit boards. Circuit boards with problems should
be removed and returned to the manufacturing plant for repair and test.
Before they are returned to service, it is recommended they have all
outstanding revisions incorporated and then undergo system testing.
PG 8
Chapter Three Preventive Maintenance
Continue.. .
Executive Summary
What is Preventive Maintenance?
Why is Preventive Maintenance Important?
What is the Return on Investment for Preventive Maintenance?
Preventive Maintenance and Power
How Often is Preventive Maintenance for Power Needed?
Preventive Maintenance Checklist for Power
Batteries are Important to Your UPS
Preventive Maintenance and Cooling
How Often is Preventive Maintenance for Cooling Needed?
Preventive Maintenance Checklist for Cooling
When to Get a Professional Involved
Conclusion
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Emerson Network Power | What You Need to Know About Your Critical Infrastructure
EmersonNetworkPower.com
PG 9
Batteries are Important to Your UPS Batteries are an important element to a data centers UPS and
unfortunately, theyre often overlooked. Semi-annual and annual
preventive maintenance will typically include the inspection of
batteries, but it is recommended that data center managers also
implement a preventive maintenance program specifically for
batteries in their system. Stay tuned for more information on
batteries and battery monitoring in our next chapter.
Preventive Maintenance and CoolingPreventive maintenance is also critical for maintaining
system cooling efficiencies, operating costs, and minimizing
potential downtime. Cooling modules have moving parts
that eventually wear out. Preventive maintenance ensures
that these components last as long as possible. It also ensures
these components perform within their originally designed
operating parameters, allowing data center managers the
opportunity to replace components before they fail.
How Often is Preventive Maintenance for Cooling Needed?Like preventive maintenance for UPS systems, the frequency and task for cooling preventive
maintenance can vary depending on the model. The factory recommends at least four preventive
maintenance visits per year, replacing belts and filters as necessary (typically two times per year for
filters and one time per year for belts).
Chapter Three Preventive Maintenance
Continue.. .
Executive Summary
What is Preventive Maintenance?
Why is Preventive Maintenance Important?
What is the Return on Investment for Preventive Maintenance?
Preventive Maintenance and Power
How Often is Preventive Maintenance for Power Needed?
Preventive Maintenance Checklist for Power
Batteries are Important to Your UPS
Preventive Maintenance and Cooling
How Often is Preventive Maintenance for Cooling Needed?
Preventive Maintenance Checklist for Cooling
When to Get a Professional Involved
Conclusion
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EmersonNetworkPower.com
PG 10
Preventive Maintenance Checklist for CoolingWhat are Service Providers Evaluating?
Some common preventive maintenance checks should include:
Air filters: Clogged air filters reduce the airflow through the systems and increase the load on the
blower drive system. This may result in reduced system cooling performance, higher operating
costs, reduced component life of the blower drive systems, and higher operating temperatures
of the equipment in the data center. These higher operating temperatures may be very localized
and hard to detect within a data center due to irregular air flow patterns. Similarly, substitution
of non-OEM filters may also change performance of the system. Lower cost substitute filters may
collapse (where the pleats fall flat against the downstream face of the filter box) if they have not
been designed for the air flow of the system. Always use OEM replacement filters when servicing
your equipment.
Blower Drive System: The blower belts, bearings, motors and
wheels need to be inspected regularly. Wear or damage to any of
these components may result in the reduction or loss of airflow
or reduced cooling performance. Again, all of these components
are specifically selected for the performance requirements of
the system, and only OEM replacements should be used. Belts,
specifically, are literally machined to match as a set of two or
three belts so that belt tension is uniform to maximize belt life.
Steam Generating Humidifiers: Humidifiers may be connected with valves and hoses that may
leak and drains may become clogged over time. These components should be inspected regularly.
Steam generating humidifiers are vulnerable to water deposits that can diminish humidifier
performance. Once these deposits form, more power is required to achieve the same level of
humidification, and the assembly begins to deteriorate toward failure.
Chapter Three Preventive Maintenance
Continue.. .
Executive Summary
What is Preventive Maintenance?
Why is Preventive Maintenance Important?
What is the Return on Investment for Preventive Maintenance?
Preventive Maintenance and Power
How Often is Preventive Maintenance for Power Needed?
Preventive Maintenance Checklist for Power
Batteries are Important to Your UPS
Preventive Maintenance and Cooling
How Often is Preventive Maintenance for Cooling Needed?
Preventive Maintenance Checklist for Cooling
When to Get a Professional Involved
Conclusion
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Infrared Humidifiers: IR Humidifier bulbs may burn out, diminishing performance. Drains and
pans should be inspected for deposits and clogs. Emerson Network Power offers the VAPURE
humidifier additive which inhibits these deposits from forming. When handling humidifier bulbs,
it is important not to touch the glass bulb with your fingers. The residue from skin oils creates a
hot spot on the bulb that reduces the life of the bulb.
Condensate Drains and Pumps: Confirm
proper pump function and verify drains are
not clogged. Obviously, the combination of a
clogged drain and a failed level sensor results in
pan overflow.
Reheat: Inspect and clean reheat elements.
Inspect and tighten support hardware.
Compressor: Inspect oil level and check for leaks. Compressors running with too much or
too little oil will see diminished service life. Always use the same type of oil supplied with the
compressor from the OEM.
Facility Fluid and Piping: Units connected to facility water or glycol should perform necessary
maintenance to assure the quality of the fluid. Contaminants in these fluids can lead to diminished
performance.
Evaporator Coils: Evaporator coils should be checked periodically to
verify they are clean and free of debris. Dirty coils are less efficient at
removing heat.
Condensers and Dry Coolers: Condenser coils should be checked
periodically to verify they are clean and free of debris. Motor mounts
should be tight. Bearings should be free and in good condition.
Refrigerant lines should be properly supported. Similar to evaporator
coils, dirty condenser coils are less efficient at rejecting heat.
PG 11
Chapter Three Preventive Maintenance
Continue.. .
Executive Summary
What is Preventive Maintenance?
Why is Preventive Maintenance Important?
What is the Return on Investment for Preventive Maintenance?
Preventive Maintenance and Power
How Often is Preventive Maintenance for Power Needed?
Preventive Maintenance Checklist for Power
Batteries are Important to Your UPS
Preventive Maintenance and Cooling
How Often is Preventive Maintenance for Cooling Needed?
Preventive Maintenance Checklist for Cooling
When to Get a Professional Involved
Conclusion
Compressor oil levels should be
checked regularly for maximum
service life.
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When to Get a Professional InvolvedMost preventive maintenance measures should be left to a qualified and trained professional.
UPS and batteries contain high voltage, and only qualified personnel should attempt preventive
maintenance or repair. Data center managers can and should provide preventive support by
replacing air filters when dirty, ensuring environmental specifications are met and maintained,
and monitoring the UPS for alarms.
ConclusionIn the current economic environment, many organizations are relying heavily on existing
equipment to maintain operations, making preventive maintenance more important than ever
before. Preventive maintenance is a critical component of every data center, and it should not be
overlooked. Without it, data center managers are compromising the efficiency, optimization and
availability in their facilities.
Liebert Services is committed to helping organizations understand their critical infrastructure,
identify problems, and incorporate solutions. Stay tuned for chapter four in our eBook What
You Need to Know About Your Critical Infrastructure to learn more about batteries and battery
monitoring. Well highlight how organizations can ensure batteries arent the weakest link in the
UPS, and outline a battery preventive maintenance program.
Chapter Three Preventive Maintenance
Executive Summary
What is Preventive Maintenance?
Why is Preventive Maintenance Important?
What is the Return on Investment for Preventive Maintenance?
Preventive Maintenance and Power
How Often is Preventive Maintenance for Power Needed?
Preventive Maintenance Checklist for Power
Batteries are Important to Your UPS
Preventive Maintenance and Cooling
How Often is Preventive Maintenance for Cooling Needed?
Preventive Maintenance Checklist for Cooling
When to Get a Professional Involved
Conclusion
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