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3.8
CT Ratio (PCU1-SP only)
Figure 3.5 PCU1-SP CT ratio/polarity
3.8.1
Modes & Settings
Timer mode: Off
Auxiliary metering: CT ratio 1A
or CT ratio 5A as appropriate
to CT secondary.
3.8.2
Connections
Connect current output from
loading unit to busbar through
CT primary (or loop lead
through the CT).
Connect S1 & S2 on CT
secondary
to
PCU1-SP
auxiliary metering input S1 &
S2.
3.8.3
Test Procedure
Switch on the main supply
switch.
Set timer mode switch to the
off position.
Ensure that the output control
is in the zero position.
Check that connections are
made as above.
Press the output on push-
button and increase the output
current to the rated CT primary
current. Read off the CT ratio
from the display.
Note:
If the CT secondary is >5A a
lower test current must be
used such that no more than
5A flows into the metering
input.
Press output off push-button.
