IMPULSE•G+/VG+ Series 4 Technical Manual
November 2022
Page 89
5.2.12.3 Load Check II Set Up (C05-01 = 9)
The Load Check II set up procedure will quickly measure and calculate the current or torque required at each of the
Load Check Zones starting with the rated load suspended. These values will automatically be stored in parameters
C05-09 through C05-24 during the Load Check II set up process.
The following steps are required to perform the Load Check II set up process.
1. Verify that when the Master Switch is at full deflection (the highest speed point if stepped, or 10V if Analog), the
Frequency Reference shown in U01-01 is equal to Motor Base Frequency shown in E01-06 (typically 60Hz).
For example, with a 3-Step speed reference, if B01-03 is set at 60Hz, then the frequency reference should be
60Hz when the Master Switch is pushed to full deflection. If the frequency reference doesn’t reach Motor Base
Frequency, set the following (depending on Speed Ref):
•
Multi-Step: B01-0x is 60Hz
•
Infinitely Variable: B02-01 = 100%
•
Analog: H03-03 = 100% and B02-01 = 100%
2. The motor should be properly Auto-tuned.
•
FLV and OLV operation – Rotational Auto-tune.
•
V/f operation – Stationary Auto-tune.
3. Ensure B02-03 and E01-09 are at the desired values. If you change these, re-run Load Check II setup.
4. Motor should be at normal operating temperature for the application (operate at or near rated capacity for at
least 10 minutes) before performing the Load Check set up process.
5. Suspend the rated load just off of the ground (this allows for accurate measurements during calibration).
6. Set C05-01 = 9.
7. Press and hold the Hoist (Up) command on the pendant or radio for full speed operation (60 Hz).
NOTE:
The Load Check set up process can be temporarily paused by lowering the load back to the ground,
keeping the load suspended, then pressing and holding the Hoist (Up) command button at full speed until
the Load Check set up process is complete.
8. When the Load Check set up process finishes its calculations, the VFD will decelerate the load to indicate the
set up calibration is complete.
NOTE:
If an application requires Load Check to be bypassed, program an MFDI to 69 (N.O.) or 6A (N.C.).
NOTE:
Upon completion of the Load Check setup process, the VFD will automatically set C05-01 = 1.
NOTE:
If an error occurs during the Load Check set up, the load being lifted may have caused the current or torque
to exceed 250%. Increase Holding Time and Testing Time, or decrease the load weight.
5.2.12.4 Clearing a Load Check Alarm (LC)
A Load Check alarm/fault can be reset by pressing the RESET key on the keypad.
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