Harrington Hoists and Cranes MR Trolley - (MR2) - Manual (Page 28)

3.5 VFD Setup (Dual Speed Only)
3.5.1

To avoid a shock hazard, DO NOT perform ANY mechanical or electrical
maintenance on the dual speed (or 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.
3.5.2

Do Not remove power to the hoist or trolley during operation.
3.5.3 All dual speed trolleys are equiped with a VFD. The VFD is used to control the high and low speeds and
the accelereations/decelerations (accel/decel) of the trolley. These speeds, 80/13 and
acceleration/decelerations, 4.0 seconds come preset from the factory. Speed (frequency) and
acceleration/deceleration time parameters can be customized. Refer to Section 3.5.6 for trolley specific
speed ranges and instructions and Section 3.5.7 for trolley specific acceleration/deceleration parameters
and instructions.
3.5.4 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
3.5.5 When power is supplied to the trolley the VFD LED operator display will illuminate as shown Table 3-3.
Table 3-3 LED Operator Display
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