Chapter 1 Installation
16
MUST400_User manual_EN_REV02 User Manual
1.6.1 Cable Connections
Note
The operations described in this section must be performed by authorized electricians or qualified
technical personnel. If you have any difficulties, do not hesitate to contact our Customer Service & Support
department.
After the equipment has been finally positioned and secured, refer to Chapter 4 Installation Drawing to connect
the power cables as described in the following procedures:
1. Verify that all the external input distribution switches of the UPS are completely opened and the UPS internal
maintenance bypass switch is opened. Attach necessary warning signs to these switches to prevent
unauthorized operation.
2. Open rear panel of the UPS, and then the power connection terminals are accessible.
3. Connect the protective earth and any necessary grounding cables to the PE terminal. The cabinet for the
UPS must be connected to the user’s ground connection.
Note: The grounding cable and neutral cable must be connected in accordance with local and national codes
practice.
Identify and make power connections for incoming cables according to one of the two procedures below,
depending on the type of installation:
Common Input Connections
4. For common bypass and rectifier inputs, connect the AC input supply cables to the UPS input terminals
(input A-B-C-N) Refer to Fig. 4-11 and tighten the connections to 5 Nm (M6 Bolt), 13Nm (M8 Bolt) or 25Nm
(M10 Bolt).
ENSURE CORRECT PHASE ROTATION AND TIGHTEN CONNECTION TERMINALS
Split Bypass Connections (option)
5. If a 'split-bypass' configuration is used, ensure that the common copper bridges between Bypass and
Rectifier inputs are removed.
Note: DO NOT REMOVE THE NEUTRAL COPPER BRIDGE
Connect the AC input supply cables to the rectifier input terminals (input A-B-C-N) Refer to Fig.4-11 and the
AC bypass supply cables to the bypass input terminals (bypass A-B-C-N) and tighten the connections to 5 Nm
(M6 Bolt) or 13Nm (M8 Bolt) or 25Nm (M10 Bolt).
Note: ENSURE CORRECT PHASE ROTATION AND TIGHTEN CONNECTION TERMINALS
Frequency Converter Mode
If the frequency converter configuration is used, connect the AC input cables to the rectifier input terminals
(input A-B-C-N) Refer to Fig.4-11 and tighten the connections to 5Nm (M6 bolt), or to 13Nm (M8 bolt), or to
25Nm (M10 bolt).
Note: ENSURE CORRECT PHASE ROTATION AND TIGHTEN CONNECTION TERMINALS.
No need to connect the bypass input cables to bypass input terminals in case of dual input version and ensure
to remove copper bridge in phases terminals. Leave the neutral copper bridge installed.
警告
危 险
