ABB Relion 620 Series, Installation Manual

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1MAC303209-MB C
Section 4
Mounting
620 series 11
Installation Manual
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 areas where dust and moisture are present.
Avoid places susceptible to rapid temperature variations, powerful vibrations and
shocks, rapid surge voltages of high amplitude, 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 IED to allow access to wires
and optical fibers and to enable maintenance and future modifications.
• Flush mounted IEDs should be possible to be added or replaced without excessive
dismantling.
4.2 Detaching and installing the plug-in unit
4.2.1 Detaching the plug-in unit
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 0.25 inch (7 mm) out of the case and the connectors are separated.
4. Pull the unit out of the case.
Before detaching the plug-in unit from the case, the auxiliary voltage must
be disconnected.