Harrington Hoists and Cranes (N)ER Hoist - ((N)ER2) User Manual
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3.6.1
To avoid a shock hazard, DO NOT perform ANY mechanical or electrical
maintenance on the dual speed ( VFD control) trolley or hoist within 5 minutes of de-energizing
(disconnecting) the trolley or hoist. This time allows the internal VFD capacitor to safely discharge.
3.6.2
Do Not remove power to the dual speed (VFD control) hoist or trolley during
operation.
3.6.3
All dual speed hoists are equiped with a VFD. The VFD is used to control the high and low lifting
speeds. The speeds come preset from the factory (Table 3-6). Speed (frequency) can be customized.
Refer to Section 3.6.10 for hoist specific speed ranges and instructions.
3.6.4
The VFD is controled by a Keypad/Display Interface. Refer to Figure 3-8 for Keypad/Display Interface
functions and descriptions.
Figure 3-8 VFD Keypad/Display Interface
3.6.5
When power is supplied to the hoist the VFD LED operator display will illuminate as shown Table 3-2.
Table 3-2 LED Operator Display