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Issue 2 22/4/98
MPC2000D
3.1.9. Relay Contacts
Rated Load:
8A @ 250V AC/8A @ 30V DC (Resistive)
6A @ 250V AC/3A @ 30V DC (Inductive)
Maximum Operating Voltage:
280V AC, 125V DC
Maximum Operating Current:
8 Amps
Minimum Permissible Load:
5V DC, 100mA
Note:
AC Inductive load PF = 0.4
DC Inductive Load L/R = 7mS
3.1.10. Dielectric Strength
2000V AC for 1 minute, between ground and:
* 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%
4. MPC2000D Schematic Diagrams
The following diagrams show typical installation schematic diagrams of the MPC2000D 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
necessary 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.
For Star/Delta starters with a 3 contactor configuration the Alarm
relay terminals 33,35,37 is designated to control the Run contactor.
The case earth must be externally grounded to earth. The terminals
11, 12 and 54 are internally connected and one of them should be
connected to either the case earth or separate earth if a separate
instrument earthing is required. This can be done as shown in the
diagram.
