Vertiv Liebert EXM - 3.2.9 Cabling Procedure

Vertiv™ | Liebert® EXM
™
50-250kVA, 480V, 60Hz User Manual | 32
3.2.9 Cabling Procedure
Once the equipment has been positioned and secured for operation, and the battery and ground
lugs have been connected (see 3.2.5 - Cable Connections), connect the power cables as
described below. (Study the reference drawing in 4.0 - Installation Drawings.)
1. Verify that all incoming high and low voltage power circuits are de-energized and locked out or tagged
out before installing cables or making any electrical connections.
2. Remove the front I/O panel to gain easier access to the connections busbars.
3. Connect the facility ground and ancillary ground bus cables to the copper ground busbar. Refer to
Figures 14 and 15. All cabinets in the UPS system must be connected to the user’s ground connection.
4. Identify and make power connections with incoming cables according to Steps 5 through 8.
Common Input Connections
5. For common bypass and main inputs, connect the AC input supply cables to the UPS input terminals
(BYP-A, BYP-B, BYP-C) and tighten the connections to 428 lb-in. (48Nm) (M12 bolt). Ensure correct phase
rotation. Refer to Figures 9 and 10 for additional details.
Split Bypass Connections
6. If a split bypass configuration is used, connect the AC input supply cables to the rectifier input terminals
(REC-A, REC-B, REC-C) and the AC bypass supply cables to the bypass input terminals (BYP-A, BYP-B,
BYP-C) and tighten the connections to 428 lb-in. (48Nm) (M12 bolt). Ensure correct phase rotation.
CAUTION
The operations described in this section must be performed by authorized electricians or
qualified technical personnel. If you have any difficulties, contact your local Vertiv
™
representative or Vertiv
™
Services.
AVERTISSEMENT
Toutes les opérations décrites dans cette section ne doivent être effectuées que par des
électriciens ou des techniciens professionnels dûment formés et qualifiés . En cas de
difficultés, communiquez avec Vertiv
™
. Pour obtenir les renseignements de contact,
consultez la dernière page de ce manuel.
NOTE
Hydraulic pressure pliers, combinative tools and piston ring pliers should be used to connect AC
wiring.
NOTE
The grounding arrangement must comply with the National Electrical Code and all applicable
local codes.
NOTE
For common bypass and main inputs, the AC input cables must be connected to the bypass
terminal (BYP-A, BYP-B, BYP-C) but not the main input terminal (REC-A, REC-B, REC-C).
NOTE
For split bypass operation, ensure that the busbars between bypass and rectifier inputs are
removed.