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Electrical Connections
15
4. Identify and make power connections with incoming cables according to Steps 5 through 10.
Common Input Connections
5. For common bypass and rectifier inputs, connect the AC input supply cables between the power
distribution panel and the UPS input busbars (A-B-C terminals) and tighten the connections to
88 lb-in. (10 N-m) using the M8 bolt provided.
Dual Input Connections
6. Remove the internal links installed between the Input circuit breaker (CB1) busbars and Bypass
Input busbars as shown in Figure 4.
7. For the bypass, connect the AC input supply cables between the power distribution panel and the
UPS input busbars (A-B-C terminals) and tighten the connections to 88 lb-in. (10 N-m) using the
M8 bolt provided.
8. For the Rectifier Input, connect AC input supply cables between the power distribution panel and
the UPS input circuit breaker (A-B-C terminals).
Output System Connections—Ensure Correct Phase Rotation
9. Connect the system output cables between the UPS output busbars (A-B-C terminals) and the
critical load and tighten the connections to 88 lb-in. (10 N-m) (M8 bolt).
Observe the battery cable polarity. Be sure that the battery connector is made with the cor-
rect polarity.
10. Refit all protective covers removed for cable installation
Frequency Converter Mode
If a frequency converter configuration is used, connect the AC input supply cables to the rectifier
input busbars (A-B-C terminals). Torque to 88 lb-in (10N-m) for M8 bolts. Ensure correct phase rota-
tion. There will not be any AC bypass supply cables to the bypass input (A-B-C terminals) and tighten
the connections.
NOTE
Both the rectifier and bypass feeds MUST come from the same utility source.
!
WARNING
If the load equipment will not be ready to accept power on the arrival of the commissioning
engineer, then ensure that the system output cables are safely isolated.
NOTE
The operations described in this section must be performed by authorized electricians or
qualified technical personnel. If any difficulties arise, contact Liebert at 1-800-LIEBERT.
NOTE
For frequency converter operation, ensure that the linking busbars between the bypass and the
rectifier input are removed.