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4.3 Wiring Installation
1.
Switch off utility power to the distribution point where the UPS will be connected. Be
absolutely sure that there are no hazardous voltages present.
2. Remove as many panels as needed for adequate access for wiring the cabinet.
3. Open the front door of the MBS Cabinet. If necessary, remove the top and bottom
shield cover panels located in front of and below the circuit breakers by removing the
screws that mount each panel in place.
4. Connect wires from the "TO UPS INPUT" terminal block to the input terminals in the
UPS. (Refer to the UPS manual).
a. The terminals must be properly torqued (see
).
b. Ensure proper phasing of the cables.
5. Connect wires from the "FROM UPS OUTPUT" terminal block to the output
terminals in the UPS. (Refer to the UPS manual).
a. The terminals must be properly torqued (see
).
b. Ensure proper phasing of the cables.
6. Connect wires from the "OUTPUT TO LOAD" terminal block to the load.
a. The load may be an external distribution panel, etc.
b. If neutral is not needed by the load, then it does not need to be supplied.
c. The terminals must be properly torqued (see
).
d. Ensure proper phasing of the cables.
7. Connect wires from the "UTILITY INPUT" terminal block to the input source power
from the building distribution.
a. The terminals must be properly torqued (see
).
b. Ensure proper phasing of the cables. The source needs to have A-B-C phase
sequence.
8. Check all work. Replace the panels that were removed for access.
Insure that the
shield cover panels have been mounted in place. Failure to do so could
subject personnel to lethal voltages.
4.4 Control Connections
Control connections must be installed from the "CUSTOMER LOW VOLTAGE
CONNECTION TERMINAL BLOCK" to the Remote Commands and Alarm Connections in
the front of the UPS cabinet.
•
These control wires must be physically separated from any power wires.
•
The length of the control wires is limited to 30 feet or 10 meters.
•
Refer to
regarding the Low Voltage Terminal Block and to the UPS manual
that shows the connection point in the UPS.
•
It is also recommended that the wires are shielded twisted pairs.
4.4.1 Control Wire Connections
is an electrical wiring schematic summarizing the connections to the Low Voltage
Connection Terminal Block.
1. Wire from terminal 3 of the Low Voltage Connection Terminal Block (LVTB) of the
Maintenance Bypass Switch Cabinet to terminal 11 of the Remote Commands and
Alarms Connections on the UPS (RCA-UPS). Second wire from terminal 4 of LVTB
to terminal 12 of RCA-UPS.
2. Wire from terminal 10 of LVTB to terminal 1 of RCA-UPS. Second wire from terminal
11 of LVTB to terminal 2 of RCA-UPS.
The optional REPO switch connections are also shown in
•
Normally Open Switch - connects across terminals 5 and 6 while the
