15/05/96
12
MPC2000 01/96B
As an optional extra for the MPC2000 a 5 RTD/Thermistor version is available, with this version 3 channels have
common alarm and trip settings and 2 channels have indi vidual alarm and trip settings.. The 2 Channels are always
RTD’s but the 3 channels are RTD’s (standard) or Thermistors (Optional)
6. MPC2000 Control Inputs/Outputs
6.1. Output Relays
The MPC2000 has 4 output relays which can be assigned as follows:
44,45,46 - Contactor A = D.O.L., Forward, Star or High Speed
47,48,49 - Contactor B = Reverse, Delta or Low Speed
50,51,52 - Aux. Relay 1 = Alarm, Contactor A, Contactor B, Start/Run
53,54,55 - Aux. Relay 2 = Trip, Trip Fail Safe, Contactor A, Contactor B
6.2. Control Inputs
The MPC2000 provides 17 inputs to provide full control and indication for the motor starter. The supply to these
terminals is derived from the Power Supply to the relay. The live side of each inputs is commoned to enable simplified
wiring to the unit, however it should be noted that the common terminals are always live when power is connected to
the MPC2000 and the should always be isolated prior to working on the wiring at the rear of the unit.
The condition of all these inputs can be viewed at any time via the Logic Inputs/Contacts Data page which enables
complete wire checking without the need to disconnect or even gain access to wiring.
Start A and Start B Input Terminals (24,1 25,2)
When the input terminals are closed the corresponding output relay is energised as long as the Local control has been
selected via the Local/Remote input and provided all other interlocks are in the healthy state. Start A only is used for
D.O.L.N.R and Star/Delta starters whilst for Reversing and Two speed starters Start A is used for Forward or High
Speed and Start B is used for Reverse or Low Speed .
Stop Input (26,3)
If these terminals are open circuited the unit will be switched off, irrespective of the state of the Local/Remote input.
Plant Interlock (33,10)
This contact represents the fulfilment of all plant conditions and needs to be closed before a start signal can be sent.
Should these conditions change while the contactor is energised and the Plant Interlock opens then the output
contactor will be de-energised and the MPC2000 will inhibit starting until the plant interlock has been reset. An attempt
to restart while this contact is still open will result in the "UNABLE TO START CHECK SYSTEM" message being
displayed.
Local/Remote (27,4)
This contact allows control of the MPC2000 to be switched between local control ( via Start A and Start B Input
Terminals (24,1 25,2)) or remote control either via the direct wired PLC inputs or via the RS485 serial link . It is also only
possible to res et the MPC2000 after a fault from the front panel without authorisation if the MPC2000 is in the Local
control mode.
