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CAUTION
The output terminals and test leads may become hot during use. Allow
adequate time to cool after the test before touching.
If the supply earth to the CU-Ps is of doubtful integrity, the earth terminal on the CU-Ps should
be connected to a solid local earth.
The loading unit output from the CU-Ps control unit is ONLY for connection to a T&R Test
Equipment PLU series loading unit. The loading unit provides isolation from the mains.
The main output is switched on and off using the ON and OFF pushbuttons. The current level
is controlled by the main output control and protected by the output circuit breaker.
WARNING
Never break the high current output circuit when the output is switched on
– this may cause arcing.
2.1.1
Connections
Ensure that the unit is switched off and the test object is isolated and grounded before making
any connections.
Configure the loading unit for either parallel or series output depending on the voltage and test
current required. Ensure that all the nuts are fully tightened. See figure 1.3.1 for connection
details.
Connect the loading unit to the control unit as shown in figure 2.1. When switched on the
control unit will automatically detect the loading unit type.
Select the desired output on the loading unit; the unit will ask if the unit is connected in parallel
or series configuration. Press the ON button for Series or the OFF button for Parallel mode.
Set the metering range switch to 10%, 50% or 100%. These ranges refer to % of maximum
rated current of the connected loading unit, so for an PLU-5k 100% is 5000A and for an PLU-
6k 100% is 6000A.
As shown in Fig 2.1, one output lead always connects to the link between terminal 1 dand 5,
and the other connects to the link between terminal 4 and 8. Connect the output cables to the
test object.
HOT
After testing, the output terminals and leads may be hot. Allow to
cool before touching connections.