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Hipulse - Single Phase ‘1+N’ UPS System 130 kVA - 110V
50
6.6 Battery protection
The battery is connected to the UPS through a circuit breaker which is manually
closed and electronically tripped via the UPS control circuitry. If the cells are cabinet
mounted this circuit breaker is fitted within the cabinet, however, if they are rack
mounted (or located remote from the main UPS cabinet) then the battery circuit
breaker must be mounted as near as possible to the batteries themselves, and the
power and control cables connected to the UPS using the most direct route possible.
The UPS electronic circuitry will trip the circuit breaker if any of the following conditions
occur:-
1. If the d.c. busbar drops below 330Vd.c. (this would normally occur during a
mains failure when the battery autonomy time has been exceeded.
2. If there is a rectifier problem and the d.c. bus rises above (2.45 V/cell exceeded
on the battery).
3. If the emergency stop is operated.
To achieve the required autonomy time, it may be necessary to parallel the battery
strings. In which case, the battery circuit breaker should be placed downstream of all
parallel battery strings.
Note: All equipment servicing procedures should be carried out by trained personnel only.
6.7 Battery Racks
6.7.1 Introduction
These are custom build fabricated racks for keeping the batteries. These are similar
in construction to Battery cabinets except for the external covers. There are no
covers and batteries are allowed to cool naturally.
6.7.2 Fitting the Batteries
1. In general, a minimum space of 10 mm must be left on all vertical sides of the
battery block to permit free air movement around cells.
2. Clearance should be allowed between the top of the cells and the underside of the
shelf above (this is necessary for monitoring and servicing cells.
3. When installing the batteries, please always work from the bottom shelf upwards to
prevent raining the center of gravity.
6.7.3 Connecting the Battery
1. All the cabinets/ racks must be earthed and bonded together.
2. When the cabinet/ rack is installed on a raised floor, the battery power cables and
circuit breaker control cables can be routed to the UPS cabinet via the floor of the
cabinets. If the cabinets are located adjacent to each other located on a solid floor
these cables can be passed between the cabinets via the lifting apertures located
in the lower sides of the cabinets
3. In general, it is recommended that the inter-connecting cables are fitted to the
batteries within their particular level before fitting the inter-level connecting cables,
followed finally by the cables to the circuit breakers.
4. An insulating shroud should be fitted cables, followed finally by the cables to the
circuit-breaker.
5. When connecting the cables between the battery extremities to the circuit breaker
always connect the circuit breaker end of the cable first .