DVS Pronto4K, Hardware Manual

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5-10
Pronto4K Hardware Guide

Next close the casing of the system as described in section “Clos-
ing the Casing” on page 5-7.
With the last step finished you have successfully replaced the defective
fan module. Once the system is turned on, no alarm should be sounded
anymore.
5.4 Power Supply Maintenance
The redundant power supply provides the system with power. It is a re-
liable and enduring part of the system because it consists of several in-
dependent power supply units: Even if one fails the others will still offer
enough power to keep the system working.
When a power supply unit failure occurs, you will be notified by a lit
alarm LED and the sounding of an alarm buzzer of the system. The
alarm can be switched mute with the mute button at the front of the
system (see section “Operation Items” on page 2-3).
Each power supply unit in the DVS system is hot-swappable, so you
can safely replace it with the system running. Follow these steps to re-
place a power supply unit:

Take a look at the power supply at the rear of the system and exam-
ine the LEDs of the units. The LED of the malfunctioning power
supply unit should be extinguished.

Next unplug the power cord from this power supply unit.

Unscrew and remove the security bar of the power supply:
The system can be operated with one power supply unit out
of order. However, if another one fails, a continued operation
of the system cannot be guaranteed. Therefore, it is recom-
mended to change a failed power supply unit immediately.
An alarm can be caused by a number of reasons. Please refer
to section “Troubleshooting” on page A-2 first for further de-
tails about what to do in case of an alarm.
For an overview of a power supply unit see section “Power
Supply” on page 2-12.