ABB Symphony Harmony Series, Instruction, Page: 280 / 402

WBPEEUI240751C0 PR31 - 1
PR31
Wiring and Cabling
Disconnection
Purpose/Scope
This procedure gives the steps to disconnect field wiring, power
wiring, and cables prior to removing an I/O or auxiliary block.
Parts
None.
Tools
•
Flat-blade screwdriver.
•
Phillips screwdriver.
Safety Considerations
Procedure
□
1. Record any block, wiring, and cabling information neces-
sary so the wiring and cabling can be easily reconnected. This
step may not be required if the front door label contains the
information, or this information is already recorded in some
other form.
□
2. Verify that power is off to the Harmony I/O system and
field devices being disconnected.
□
3. Disconnect all field wiring from the block.
Screw Terminals
If the wiring is attached using screw terminals, remove each
wire attached.
Clamp Terminals
If the field wiring is attached using clamp terminals, unplug
the terminal strip from the connector on the base. Individual
wires can remain connected to the terminals.
15 min.
WARNING
1. Verify the main power, field power, and power entry panel
circuit breakers/switches are turned off before starting installa-
tion, retrofit, upgrade, or wiring procedures. Failure to do so
could result in severe or fatal shock. Do not turn the power on
until the installation, retrofit, upgrade, or wiring procedures are
complete.
W1