Harrington Hoists and Cranes RH Wire Rope Hoist User Manual
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3.5
Electrical Connections
3.5.1
Ensure that the voltage of the electric power supply is proper for the hoist or trolley.
3.5.2
Do NOT apply electronic soft-start control or voltage varying controls to the RH’s
lifting or traversing motors. Use of such devices may cause the motor brake and other electrical
components to malfunction. For variable frequency drives contact Harrington for more information.
3.5.3
Before proceeding, ensure that the electrical supply for the hoist or trolley has
been de-energized (disconnected). Lock out and tag out in accordance with ANSI Z244.1 “Personnel
Protection -Lockout/Tagout of Energy Sources”.
3.5.4
Installing Power Supply Cord
1) Refer to Figure 3-29 and the wiring diagram provided with the Hoist.
2) Remove Control Cover (A) or open the metal electric enclosure.
3) Loosen the Cable Fitting (C) located on the left side of the electrical enclosure and insert the power
supply cord. Pull through enough cord to reach the Power Supply Terminal (D) then securely
tighten the Cable Fitting (C).
4) Connect the 3 phase power leads (L1, L2 and L3) and the ground lead of the Power Supply Cord
to the Power Supply Terminal. Make sure the terminals are securely tighten and each lead is
completely isolated.
5) Replace the Control Cover (A) or close the metal electrical enclosure. Be careful to not damage
the seal or sealing surfaces and make sure to securely tighten all fasteners or latches.
Figure 3-29 Installing Power Supply Cord