Section 4 Mounting
4.1 Checking environmental conditions and mounting
space
The mechanical and electrical environmental conditions at the installation site must be
within the limits described in the technical manual.
• Avoid installation in dusty, damp places.
Avoid places susceptible to rapid temperature variations, powerful vibrations and
shocks, surge voltages of high amplitude and fast rise time, strong induced
magnetic fields or similar extreme conditions.
• Check that sufficient space is available.
Sufficient space is needed at the front and rear of the protection relay to allow
access to wires and optical fibers to provide sufficient ventilation to the protection
relay and to enable maintenance and future modifications.
• Ensure that flush-mounted protection relays can be added and replaced without
excessive dismantling.
4.2 Detaching and installing the plug-in unit
4.2.1 Detaching plug-in unit
Before detaching the plug-in unit from the case, the auxiliary voltage
must be disconnected.
1. Turn off the power.
2. Open the seal on the front panel by removing the sealing wire and screw the
sealing screw all the way in.
3. Lift the handle to 90 degrees to release the latching mechanism.
The plug-in unit is pushed about 7 mm out of the case and the connectors are
separated.
4. Pull the unit out of the case.
1MRS757641 E Section 4
Mounting
620 series 11
Installation Manual
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