Technical Manual
P&B Engineering
ISSUE 7 28/9/99
Page
5
3.8. Fault Time Delays
Accuracy:
+/- 0.5 seconds or +/- 2% of time
Exceptions
High Set Over-current:
-0.1 to +0.2 sec. up to 1 second
Earth Fault Trip:
-0.1 to +0.2 sec. for less than
1 second delay Total Run Time
Accuracy:
+/- 2%
3.9. Relay Contacts
Rated Load:
2.5A @ 250V AC/8A @ 30V DC (Resistive)
Maximum Operating Voltage:
280V AC
Maximum Operating Current:
2.5 Amps
3.10. 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.
3.11. Auto Restart Circuitry
Accuracy:
+/- 20%
4. Schematic Diagrams
The following diagram shows the connection diagrams of the unit when used for Protection and Control.
The following points should be noted:
It is recommended that the 3 phase input voltage should be fully used as the Power & Power Factor functions will not
work with a single phase reference.
We recommend that the reference voltage is fuse protected.
For core balance Earth Fault protection a signal converter is available which converts the 1 amp CT output into the
format required by the unit.
The internally mounted Stayput Stop Push-button output contacts are wired to terminals such that these can be directly
wired to interrupt the contactor circuit or can be connected back into the stop input of the to provide
indication.
For Star/Delta starters with a 3 contactor configuration the Alarm relay can be designated to control the Run
contactor.
Summary of Contents for MPC2000+
Page 4: ......
