User's Manual

Table Of Contents
DIB-500 R4.1 Component replacement
Replacing components of the VAC and alarm system expansion – optional
198 Installation, Operation and Service Manual 90DIB500R41IM_FCC02 99.1
Disconnecting external alarms (via alarm input/output module)
Before replacing the mounting frame, the external alarms connected to the alarm input/
output module must be disconnected. The alarm input/output module is installed in a
mounting frame.
If an external alarm is not connected, alarm jumpers are installed between the terminals
of the alarm inputs in the condition as supplied to the customer to short-circuit the con-
tacts. If installed, these alarm jumpers must additionally be removed when external
alarms are disconnected. The removed alarm jumpers will be required again when
external alarms are reconnected.
Documentation of the specific pin assignment
During commissioning the external alarms were connected depending on the desired
alarm signalling. Before disconnecting the external alarms, ensure that the pin assign-
ment is documented properly to be able to restore the original state following the
replacement.
Proceed as follows to disconnect external alarms:
Preparation:
The network element must have been put out of operation temporarily, refer to sec-
tion 8.1 on page 163.
The preparatory tasks must have been performed, refer to section 11.8.2.1 on
page 197.
The tools and aids must be available, refer to section 11.2.6 on page 174.
The pin assignment of the external alarms must be documented for reconnection.
Carry out the following steps:
Risk of electric shock
Electric shock when touching live parts. Hardware components in the equipment cabi-
net are live.
When performing work in the equipment cabinet, ensure that the voltage source on
site is switched off. This must have been checked with a voltmeter.
1. Remove the safeguard/s that protect the connected cables in the equipment rack
against tensile strain such as cable ties.
2. Cautiously press the lever (1) downward to open the clamps of the connectors (2),
refer to Figure 11.16.
Figure 11.16 Alarm input/output module - connection
2
1