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The earth for the RTD's are on terminals 11, 12 and 54. These are internally connected so only terminal 11 need be
wired to an external earth if requested. See Section 4. For further details.
As an optional extra for the MPC2000D a 5 RTD/Thermistor version is available, with this version 3 channels have
common alarm and trip settings and 2 channels have individual alarm and trip settings.. The 2 Channels are always
RTD's but the 3 channels are RTD's (standard) or Thermistors (Optional)
5.6. Power.
The Power applied to a motor is displayed on the MPC2000D and is calculated from the Current and Voltage inputs
to the relay. Please note that due to this calculation the Power and Power Factor is less accurate for Motors with a CT
Primary of less than 10 Amps.
6. MPC2000D Control Inputs/Outputs
6.1. Output Relays
The MPC2000D has 4 output relays which can be assigned as follows:
5,7,9 - Contactor A = D.O.L., Forward, Star or High Speed
6,8,10 - Contactor B = Reverse, Delta or Low Speed
33,35,37 - Aux. Relay 1 = Alarm, Contactor A, Contactor B, Start/Run
34,36,38 - Aux. Relay 2 = Trip, Trip Fail Safe, Contactor A, Contactor B
6.2. Control Inputs
The MPC2000D 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 MPC2000D 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 (68,67 66,65)
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 (64,63)
If these terminals are open circuited the unit will be switched off, irrespective of the state of the Local/Remote input.
Plant Interlock (58,57)
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 MPC2000D 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.
Page 10
Issue 2 22/4/98
MPC2000D
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