Figure 1- HRVS-DN Cabinet Type IP31 (NEMA1)

Figure 2- HRVS-DN Chassis Type (IP00)

By using thyristors (SCRs) in a phase angle control mode, reduced voltage control can be achieved. Phase control makes it possible to gradually increase the motor terminal voltage from an initial set point up to the system supply voltage level. The related starting current and the starting torque can be optimally adjusted to the motor/load conditions.

Figure 3 - Principle Diagram of Digital Medium Voltage Soft

Starter (Bypass Preparations not Shown)

Figure 4 - Phase Control of the Line Voltage Using Semiconductor (SCR) Elements

Figure 5 shows a principal voltage increase curve. Figure 6 demonstrates the torque reduction compared to the DOL torque. Figure 7 demonstrates typical behavior of motor current.

Figure 5 – Voltage Increase

Figure 6 – Torque Reduction

Figure 7 – Current Limit

In addition, the Solcon HRVS-DN soft starters provide the "soft stopping" function as a standard feature. Similar to the reduced voltage start, a stop command gradually reduces the motor voltage over time until the motor stops. Abrupt stopping is avoided, a specific advantage in pumping applications to prevent the damaging effects of water hammer and on conveyor belts where the load may be damaged by an abrupt stop.

Technical Data

How Soft Starters Work?

Power Section and Connection Harness

Control Module

Firing Transformer

EPT-Tx and EPT-Rx

Figure 8 – HRVS-DN IP00 Unit (OEM Kit) The IP00 unit (OEM kit) is available for building into custom enclosures or other relevant equipment.

It consists of the following (refer to Figure 8 above):

• Power Section consists of the 3 identical phase stacks, firing PCBs, power supplies to the firing PCBs (in HRVS-DN from 10kV and up power supplies to the firing PCBs are separated from the Power Section), 3 CTs and the connection harness to the low voltage compartment (including copper wires and fiber optic wires). The Power Section is installed in the medium voltage compartment of the cabinet.

• Control Module is the “brain” of the soft starter. It consists of the main CPU PCB, fireboard PCB, power supply, optional PCBs (when ordered) and input/output interface terminals. The Control Module for HRVS-DN is identical for all ratings and suitable for mounting in the L.V. compartment of the cabinet which should be fully segregated from the M.V. compartment. Interposing relays should be connected to all HRVS-DN auxiliary contacts, three relays must be incorporated: Immediate, End of Acceleration and Fault.

• Firing Transformer. This transformer is applicable for 115VAC or 230VAC control voltages.

For HRVS-DN controlled by DC control voltages - DC power supply is supplied – for details consult the factory. The Firing transformer is installed in the low voltage compartment of the cabinet and supplies control power to the firing PCBs located in the Power Section of the HRVS-DN in the medium voltage compartment of the cabinet.

• EPT-Tx (transmitter) and EPT-Rx (receiver) are used instead of the traditional voltage transformer to measure the input voltage. The EPT-Tx is installed in the medium voltage compartment and is connected to the mains bus bars downstream from the Line Contactor. The EPT-Rx is installed in the low voltage compartment of the cabinet. The EPT-Tx and EPT-Rx are connected by 2 fiber optic wires which are part of the connection harness.

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HRVS-DN IP00 Unit (OEM Kit)

Figure 9 – Typical Connection of HRVS-DN IP00 Unit (OEM Kit) Notes:

• Figure 9 shows a typical connection of an HRVS-DN IP00 unit (OEM kit) of up to 6.6kV with a control voltage of 115/230VAC. For connection diagrams for other models consult the factory.

• L1B, L2B, L3B bus bars are only available in HRVS-DN up to 6.6kV.

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Typical Connection of the HRVS-DN IP00 Unit (OEM Kit)

Figure 10 – Typical Connection of HRVS-DN up to 6.6kV with Line Contactor and Bypass Contactor

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Typical Connection of the HRVS-DN in a Cabinet

Typical Connection of HRVS-DN up to 6.6kV

The HRVS-DN must be connected with a Line Contactor and a Bypass Contactor as demonstrated in Figure

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Typical Connection of HRVS-DN from 10kV and up. The HRVS-DN must be connected with a Line Contactor and a Bypass Contactor as demonstrated in Figure

Select the HRVS-DN according to the motor's Full Load Ampere (FLA) - as indicated on its nameplate (even if the motor will not be fully loaded). Soft Starter Full Load Current (FLC) must be ≥Motor’s Full Load Ampere (FLA). The HRVS-DN is designed to operate under the following maximum conditions:

Ambient Temperature

[°C]

Max. Starting Current[A]

Max. Starting Time at 400%

FLC [sec]

Thyristors PIV rating, internal circuitry and insulation define the following voltage levels: 2,300V, 3,300V, 4,160V, 6,600V, 10,000V, 11,000V, 13,800V and 15,000V. Each soft starter is suitable for 50/60Hz. PIV level is rated at 3 times the rated voltage or higher.

HRVS-DN Selection

The HRVS-DN should be selected in accordance with the criteria of motor current and starting conditions. Motor Current and Starting Conditions

50 400%xFLC 30 Max. starts per hour: 2 starts per hour at maximum ratings. PIV (Peak Inverse Voltage)