COVER HS Series – User manual
COMEX S.A.
17
2.9.
Electrical installation
–
general reqirements
For safety reasons, it is necessary to install appropriate protections in the form of surge
suppressors or other protective devices in the UPS distribution board. This chapter provides
general practical information for installation by qualified electricians. In addition, staff with the
appropriate knowledge and authority should be aware of the standards and standards
applicable to the local market for type and cross-section of wires, their arrangement and their
load capacity. It is recommended to use flexible hoses type LgY or OpD. Detailed installation
instructions are available from your UPS distributor.
2.9.1
Power input of UPS
The UPS should be powered from an electrical switchgear equipped with a suitable security
device selected for maximum system power and flexible hoses with appropriate current carrying
capacity selected for the protection used.
If you need to install RCDs on the UPS power supply, keep in mind that these units should:
be sensitive to unidirectional DC current pulses (Class A)
not be sensitive to transient current impulses
adjustable sensitivity range 0.3 - 1A.
The RCD must be sensitive to unidirectional DC current pulses and insensitive to transient
current pulses as shown below:
Figure 2-19 Circuit breaker designation RCD
2.9.2
Battery circuit protection
The battery required for proper operation of the power supply consists of a standard of 40 12
V batteries connected in series. 3 wire installation with center neutral is required, taken from
a central connection between battery 20 and 21. The battery circuit must be protected with a
suitable fuse that is rated for the power of the UPS.
A detailed drawing of the battery installation is shown below:
Figure 2-12 Diagram of serial connection of 40 batteries with central neutral point
