Removing And Inserting The Relay Modules - Siemens 7UT51 Instruction Manual

17
Installation and Servicing
17.3

Removing and Inserting the Relay Modules

A 7UT512 relay consists of a relay module that is
inserted into the relay case and secured by the relay
cover (see Figure 17.2). A 7UT513 has a larger case
that holds two modules: a main module and a smaller
auxiliary module.
The wiring connections are made to the terminal
blocks on the back of the case. When the module is
inserted into the case, the module is automatically
connected to the terminals.
The relay module(s) can be removed to make the case
easier to handle during installation, and must be
removed to perform any hardware modifications and
some maintenance procedures. This section
describes how to remove the module(s).
1. Remove the front cover from the relay: Open the
horizontal, hinged panels at the top and bottom of
the front cover and loosen the four screws that
hold the front cover to the relay's case (see
Figure 17.3).
2. Pull the releasing levers at the top and bottom
edges of the front panel to unplug the relay from
the connectors inside the back of the case, as
shown in Figure 17.4. Carefully pull the relay out
of the case and place it on a conducting surface.
Figure 17.2 Components of a 7UT512 Relay
180
Hazardous voltage or current. Loss of
system protection.
Can cause death, serious personal
injury, or property damage.
Only qualified personnel should install or
perform maintenance on a relay. Read and
understand this manual before proceeding.
Ensure that backup protection of the
protected equipment is operational before
removing the relay from service.
-
De energize and ground the devices and/or
equipment to be protected before installing
the relay.
Before performing work on current
transformer wiring, always short circuit the
secondary of all the current transformers.
When the relay module is out of the case,
protect it from electrostatic discharges by
touching a grounded surface before
touching the module.
7UT51 v3
PRIM-2330C