7.5 kVA - 15 kVA UPS
Parallel for redundancy System
User’s and Installation Manual
1012833
Revision 4
14
Mains and load connections
The proper connection order is as follows:
1. Check that electrical connections to the installation site have been properly
executed. Also check fuse or circuit breaker ratings and cable dimensions against
figure 7 and table 2.
2. A readily accessible disconnect device must be incorporated in the fixed wiring. The
disconnect device shall have a contact separation of at least 3 mm.
A warning label must be added on all primary power isolators installed remote from
the UPS area to warn electrical maintenance personnel that the circuit feeds a UPS.
The warning label shall carry the following wording or equivalent:
ISOLATE UNINTERRUPTIBLE POWER SYSTEM (UPS) BEFORE WORKING ON
THIS CIRCUIT
3. Switch off the supply to the distribution point to which the UPS units are to be
connected.
4. For extra safety, also remove the fuses from the selected lines.
Make absolutely sure that there is no power.
5. The UPS units and the parallel module should be connected in accordance with
figure 7.
6. Remove the front panels and open the left side panel of both UPS units (Fig. 5a).
7. Connect input cables and output cables to the UPSes (Fig 5b) and to the parallel
module (Fig 6.).
Note: Make sure that the neutral of UPS input is properly connected.
Pay special attention on the input phases. Phases 1, 2 and 3 have to be the same in
pairs in UPS bypass inputs and parallel module bypass input. Correct phase rotation
is not enough.
8. Make sure that the UPS unit output cable is connected to the parallel module.
9. Connect the parallel information cable between the UPS units. Connect the cable to
terminal X4 on the parallel connection circuit board beside the input and output
terminals (Fig 5b). The shield of the parallel information cable have to be grounded
to the UPS frame from the other end of the cable. Connect the cable shield to the
screw beside the parallel connection circuit board.
10. Connect the auxiliary contact information of the parallel module maintenance bypass
switch to both UPSes with the cable delivered with the parallel module. Connection
in UPS is to terminal X221 behind the relay interface (See fig. 5b). Make the
connections according figure 7.
11. Also connect the computer and alarm connections according to chapter 7.
These connections are behind the upper front panel.
The UPS system is now connected to the mains and to the load but there is no power.
Make sure that the connections are properly made.
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