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Dual Input Feed
Refer to the schematic drawing and connection table in Figure 3.9.
1.
The UPS is supplied (as standard) with facilities for a single cable feed for the rectifier and bypass supplies. For a dual
feed configuration remove the links between 1L1-2L1; 1L2-2L2; 1L3-2L3 and 1N-2N, on the Input Terminal Block (see
Figures 3.6 and 3.7).
2.
Connect the UPS input supply cables to terminals 1L1, 1L2, 1L3 and 1N on the UPS main terminal block (see Figures
3.6 and 3.7). Ensure correct (clockwise) phase rotation.
CAUTION: The input Neutral cable must ALWAYS be connected.
3.
Connect the UPS bypass supply cables to terminals 2L1, 2L2, 2L3 and 2N on the UPS main terminal block (see
Figures 3.6 and 3.7). Ensure correct (clockwise) phase rotation.
CAUTION: The bypass Neutral cable must ALWAYS be connected.
4.
Secure the cables to the fixing rail located below the connection terminals.
5.
10kVA – 25kVA Models only. Ensure the bypass cables are connected to the correct terminals on the Filter Board (see
Figure 3.6). These will be reconfigured by the commissioning engineer if necessary.
6.
25kVA – 50kVA 'C' cabinet models only: Ensure the single input feed links are removed between the input and bypass
supply terminal (see Figure 3.7). Leave the neutral (N) link in place.
3.7
Connecting the UPS output
WARNING: Opening or removing the UPS-covers will create the risk of exposure to dangerous voltages if
power is connected to the UPS.
3.7.1
Safety notes
Please ensure you read and understand the following safety notes before you begin the UPS electrical installation.
1.
All operations detailed in this section must be performed by an authorised electrician or qualified personnel.
2.
Once the electrical installation is completed the initial UPS start-up must be performed by qualified personnel
authorised by the manufacturer.
3.
Do not operate the UPS if there is water or moisture present.
4.
When carrying out any work on the UPS output power cables you must ensure that the UPS output is isolated at the
load supply distribution panel, and where possible locked out. Warning notices should be posted where applicable to
prevent inadvertent operation of the output supply isolators.
3.7.2
Preparation for the output cabling
Circuit breakers (or equivalent protection) must be fitted between the UPS output and load equipment to provide additional
protection to the UPS in the event of an overload or short circuit, and also provide a means of isolating individual loads if
required.
Before you start connecting the UPS output cables to the load distribution panel:
• Ensure that the potential (maximum) load does not exceed the UPS model output power rating (OUTPUT POWER)
on the nameplate.
• Ensure the output circuit breakers are correctly sized with respect to the load and cable rating.
• The maximum total load rating and maximum load rating of the individual load sockets should be indicated on the
output distribution board.
• The circuit breakers must comply with the prescribed IEC Standards (e.g. BS7671). It is recommended that a
separate output distribution board is provided for the load.
© 2023
Kohler Uninterruptible Power
29/11/23
3: Installation
19
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