COVER series MZ – User manual
COMEX S.A.
9
If it is required to install RCDs on the UPS, please note that these devices should:
be sensitive to unidirectional DC current pulses (class A)
not be sensitive to transient current pulses
have adjustable sensitivity in the range of 0.3 - 1A.
The RCD must be sensitive to unidirectional DC current pulses, and insensitive to transient
current pulses, as shown in the figure below:
Figure 2-5 Marking the RCD
2.5.2.
Battery circuit protection
The battery required for the correct operation of the power supply consists of 30 - 40 12 V
batteries connected in series. A 3 wire installation is required with a neutral center point, taken
from the central connection between the 20 and 21 batteries, in the case of a 40-battery chain.
The battery circuit must be protected by a suitable fuse, selected according to the UPS power.
A detailed drawing of the battery installation is shown below:
Figure 2-6 Diagram of connection in series 40pcs of battery with a central center point
