T&R PCU2 mk5, Operating And Maintenance Manual

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12
The full scale range of the ammeter is dependant on the loading unit. A switch is provided on
the PCU2 to switch the meter between the series and parallel range.
Loading Unit
Output
arrangement
Ammeter
range
Meter full
scale
Resolution Accuracy
LU5000
LU8000
Series
Low 2500A 1A 0.6% 6d
High 5.00kA 10A
0.6% 6d
Parallel
Low 5000A 1A
0.6% 6d
High 10.00kA 10A
0.6% 6d
LU6000
Series
Low 3000A 1A 0.6% 6d
High 6.00kA 10A 0.6% 6d
Parallel
Low 6000A 1A 0.6% 6d
High 12.00kA 10A 0.6% 6d
If the metering cable is not connected between the PCU2 MK5 control unit and the external
loading unit, the ammeter will not function and the output will not switch on.
1.2.5 Overload trip
The output of the unit is protected by an overload trip that operates at approximately 115% of
full load current.
Loading Unit
Output
arrangement
Metering range
Overload trip
current
LU5000
LU8000
Series
Low 2875A
High 5750A
Parallel
Low 5750A
High 11500A
LU6000
Series
Low 3450A
High 6900A
Parallel
Low 6900A
High 13800A
The unit is also protected by a circuit breaker on the control unit output. This will trip before the
electronic trip on high range (at approximately 10000A for an LU5000/8000 or 12000A for an
LU6000).