MPS3000 TERMINALS
Page 14 of 67
Output Relays
The MPS3000 incorporates four output relays. Each has a C/O contact, rated 8 A / 250 VAC resistive, 2000 VA
inductive.
The four relays can be configured for alarm, alarm fail-safe, trip, trip fail-safe, overload, earth (Ground) Fault, KWH
pulses and also for external contactors control required for the MPS3000-C.
Note: When a relay is configured as an alarm Fail-Safe or trip Fail-Safe, the relay is immediately energized when
the auxiliary power supply is connected to terminals 61 & 62. The following N.O and N.C. terminals are given for
Non-Energized relays.
Output Relay A:
N.C .......................................................... 44&45
N.O .......................................................... 44&46
Relay A can be configured as an Alarm, Alarm Fail-Safe, Tripping / Alarm (where it can be set for any group of
faults), # Of Starts Pre Alarm (can be used to prevent start which will cause Too Many Starts fault) , U/V start
prevent or KWH pulse relay. See later for additional control functions used with the MPS3000-C.
Output Relay B:
N.C .......................................................... 47&48
N.O .......................................................... 47&49
Relay B can be configured as Trip, Trip Fail-Safe, Tripping / Alarm (where it can be set for any group of faults) or #
Of Starts Pre Alarm, u/v Start Prevent or (I > 0) After Trip relay. See later for additional control functions used with
the MPS3000-C. When configured as (I > 0) After Trip, it can be used to trip upstream breaker if current still flows
After the MPS3000 has issued a Trip signal.
Output Relay C:
N.C .......................................................... 50&51
N.O ...........................................................50&52
Relay C can be configured as Alarm Fail-Safe, Alarm, Contactor A/B status, Start/Run and Running indication.
See later for additional control functions used with the MPS3000-C.
Output Relay D:
N.C .......................................................... 53&54
N.O ...........................................................53&55
Relay D can be configured as a Trip, Trip Fail Safe or Ready relay.
The relays can be configured to receive two isolated alarm signals and two isolated trip signals.
Note: When a relay is configured for Fail Safe operation, relay is energized when MPS3000 is powered and de-
energized upon fault. Relay C is designed mainly to be used as an alarm fail-safe, to alarm constantly when the unit
is not powered.
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