PBSJ Retrofit Installation

Several variations of the PBSJ exist; the retrofit design uses the current vision hardware configured as either an overcurrent/earth fault protection relay (FPC) or motor overload protection relay (MV2). The new unit is fitted within a chassis and prewired to the same style terminals as the original device. It is designed to fit into the same aperture without requiring any cable changes.

Below are the PBSJ relays available as retrofits alternatives.

PBSJ Relay Type Equivalent Relay Part No.

Type Function

PBSJ3E5N11 MV2 2ph O/C + E/F N11Retrofit PBSJ3E5N12 MV2 2ph O/C + E/F N11Retrofit PBSJ 120 FPC 2ph O/C + E/F 120Retrofit PBSJ 140c FPC 3ph O/C + E/F 140cRetrofit PBSJ 3E5c MV2 3ph O/C + E/F 3E5cRetrofit

PBSM 20 MV2 3ph O/C + E/F M20Retrofit PBSM 50c unsupported The 50C was designed for use on variable frequency drives, the MV2 hardware is tuned specifically at the fundamental frequency, 50/60Hz.

Wiring and terminal configurations.

In this example a PBSM20 is replaced with a M20 Retrofit.

This guide is to be used as an aid for the installation of the retrofit replacement for the PBSJ range of relays produced by P&B from ~1985 until 2002. Notably the case structure and relay functionality is also akin to that of the SPAJ and SPAM relay range from ABB.

PBSJ 120 Overcurrent & Earth Fault Relay

PBSJ Retrofit Installation

• Removal of the existing device

1 2

3 4

• Installation of the new device 5 6

1 Firstly if the unit is still powered, extract settings.

Remove LV control fuses and isolate as necessary.

2 Taking note of the terminal positions and wiring idents begin by loosening and removing the terminals lugs from the terminal block.

Remove securing slides from the top and bottom by loosening the two screws as indicated. 3 Once terminals and fixing slides are removed withdraw the relay front the front of the switchgear. 4 Relay removed from the panel, with control wires hanging loose.

5 The retrofit device is inserted from the front of the switchgear panel.

6 The device is secured by means of the screw clips as highlighted. (only bottom clip visible) To attach <a> wind the threaded bar anti-clockwise so the end point is away from the front, <b> push the front of the clip onto the retaining post 1 then <c> slide across to mate with post 2. <d> finally, using a terminal driver, screw the threaded bar clockwise so the post makes solid contact with the rear of the switchgear panel. <a> <b> 1 2

<c> <d>

PBSJ Retrofit Installation

7 8 9 10

Below are some suggested settings which may be useful to provide similar functionality and increased protection to that of the original device. Setting thresholds and timings should be calculated correctly referring the master protection guide. All variants: >Settings Menu >Control Settings >Relay Outputs> Relay 2 and 3 set to TRIP, Relay 4 as HEALTHY >Settings Menu >Protect Settings > Set Function=On, Trip=On, Reset=Panel for the desired functions

Motor Application: >Settings Menu >Control Settings >Starter Settings > NO STARTER >Settings Menu >System Settings >Motor Settings > CT Primary, FLC, EFCT as appropriate also Set VT Primary (to busbar voltage) and VT Secondary (to ac control voltage) the auxiliary supply is wired in parallel to the VT input which will provide kW and PF monitoring if an ac control voltage is used.

>Settings Menu >Protect Settings > Max Start Time, Thermal, Overcurrent, Earth Fault, Single Phase, Unbalance, Internal Error Feeder Application: >Settings Menu >System Settings >Feeder Settings > CT Primary, EFCT as appropriate also Set VT Primary (to busbar voltage) and VT Secondary (to ac control voltage) the auxiliary supply is wired in parallel to the VT input which will provide kW and PF monitoring if an ac control voltage is used.

>Settings Menu >Protect Settings > Overcurrent, LS Overcurrent, Earth Fault, Earth Fault HS

7 Re attach the wiring to the terminals following the terminal guide on the top of the relay. Note, only for the PBSM20, the wiring to the left hand side differs slightly from the original installation <see picture 2> For all other relay variants the wiring locations are identical between the retrofit and original relay. 8 Retrofit relay secured and cables re connected. 9 Side view of the installed retrofit relay. 10 Front view of the retrofit relay prior to the control fuses being refitted. Once powered, the relay can be programmed with appropriate settings equivalent to the original device. In general for retrofit applications the unit is used as a protective device only, the FPC and MV2 are fundamentally Protection Relays as well as Controllers. Output relay 1 of the retrofit device is unused as this is used as the primary ‘control’ output contact in a typical control mode.