15/05/96
8
MPC2000 01/96B
* Current Inputs
* Voltage Inputs
* Auxiliary Power Supply, with 1000pF Suppression Capacitors removed
* Control Terminals, with 1000pF Suppression Capacitors removed.
3.1.11. Auto Restart Circuitry
Accuracy:
+/- 20%
3.2. MPC2000 IMMUNITY AND EMISSIONS TESTS
The MPC2000 was successfully tested at the ERA Technology Centre in Leatherhead on the 7th April 1992 to
comply with the European Standards on Emissions (EN50081-1) and Immunity (EN50082-2).
4. MPC2000 Schematic Diagrams
The following diagrams show typical installation schematic diagrams of the MPC2000 unit when used for both
Protection and Control and when used as a Protection Only device.
The following points should be noted:
Although not shown on the diagrams it is recommended that the 3 phase input voltage should be fused after the take
off point from the system voltage or in the case of HV systems where a voltage transformer is used the secondary
should be also be fused.
When using the residually connected Earth Fault scheme it may be neccessary to fit a swamping resistor between the
common connection and the earth connection. It is generally advisable to use Core balance ct's whenever possible.
If the internally mounted Emergency Stop pushbutton is installed, it may be beneficial, so the MPC2000 reads
Emergency Stop rather than Hard Wired Stop, to connect externally the output contacts 64&65 to the External
Emergency Stop input terminals 35,12 in addition to hard wiring the output to the contactor closing circuit.
For Star/Delta starters with a 3 contactor configuration the Alarm relay terminals 50,51,52 is designated to control the
Run contactor.
The schematics shown are for 1 Amp secondary CT's, for CT's with a 5 Amp secondary the terminals 82,85,88 & 91
should be moved to terminals 83,86,89 & 92 respectively.
