Rockwell Automation 2364E Non-Regenerative DC Bus Supply Unit (NRU) - Manual (Page 59)

Publication 2364E-5.01 April 2002
Installing Your NRU 9-7
3. Verify that the voltage across X1 to X2 (the secondary side) of
PT2 (the control power transformer) is within the specified toler-
ance:
4. Verify that the diode bridge fan is running and blowing air over
the bridge.
5. Verify that the "DC Bus Energized" pilot light (PL1) is illumi-
nated.
6. Verify that the "Not Faulted" pilot light (PL2), if supplied, is illu-
minated. If it is not illuminated, verify that:
a. The phase-loss relay (CR1) is energized.
Note: If the phase-loss relay is not energized, disconnect the
power and interchange any two input wires and try again.
b. The other contacts of the circuit are closed.
7. Perform the set up of the Powermonitor II, if supplied, per the
manufacturer’s instructions.
8. If the ground fault detection meter is supplied, set the red warning
indicator needle 50V higher than the maximum value measured
by the black needle (up to 200V, maximum).
Figure 9.3
Setting The Warning Trip Voltage
Important: The black needle of the ground-fault detection meter
should typically read a low value (between 80 and
100V) when the inverters on the DC bus are modulating.
This voltage is produced by capacitively-coupled
currents to ground in the motor’s cables and windings.
Nominal AC Control
Voltage (V AC)
Minimum AC Control
Voltage (V AC)
Maximum AC Control
Voltage (V AC)
115 104 126