IMPULSE
®
•G+ Mini Technical Manual
November 2020
Page 69
5.2.7 Load Check II™
The Load Check II function is a load-limiting feature which ensures the programmed load limit of the hoist is not
exceeded. It prevents the lifting (and potential stall) of a load that is overweight. When the IMPULSE
®
•G+ Mini
detects an overload condition it prevents any further lifting. The load may then be lowered at the speed that is
specified by the Load Check Lowering Speed (C05.08).
V/f Operation (A01.02 = 00)
When using Load Check II in V/f control mode (during lifting) the IMPULSE
®
•G+ Mini will compare the motor
current readings (U01.03) to values stored during the Load Check set up process. If they exceed the values for the
active Load Check Zone, the VFD will stop based on the LC Alarm Action (C05.02) and display a Load Check
alarm (LC).
OLV Operation (A01.02 = 02)
When using Load Check II in Open Loop Vector control mode (during lifting) the IMPULSE
®
•G+ Mini will compare
the motor torque readings (U01.09) to values stored during the Load Check set up process. If they exceed the
values for the active Load Check Zone, the VFD will stop based on the LC Alarm Action (C05.02) and display a
Load Check alarm (LC).
NOTE:
Precautions should be taken when two or more hoists are used to lift a single load.
Example:
Use a normally closed relay from the load check output to break the raise (FWD Run) command to the
other hoist(s). This will ensure that all hoists stop lifting if one hoist is overloaded.
5.2.7.1
Load Check II Set Up (C05.01 = 09)
The Load Check set up procedure will quickly measure and calculate the current or torque required at each of the
Load Check Zones. These values will automatically be stored in parameters C05.09 through C05.24 during the
Load Check set up process.
To following are the steps required to perform the Load Check set up process.
1. Auto-tune the motor.
•
OLV operation – Rotational Auto-tune (stationary is acceptable, though not ideal).
•
V/f operation – Stationary Auto-tune.
2. With Load Check disabled, lift the rated load a foot or two off the ground.
3. Set C05.01 = 09.
4. Press and hold the Hoist (up) command for full speed operation.
NOTE:
The Load Check setup process can be temporarily paused by lowering the load (suspended), then issuing
a new Hoist (up) command at full speed until the Load Check set up process is complete.
5. When the Load Check set up process finishes its calculations, the VFD will decelerate the load to indicate that
the set up calibration is complete.
NOTE:
The Load Check setup process will only complete if the motor reaches full speed (Base Frequency) for two
seconds. If using an analog or Infinitely Variable speed reference, make sure that no biases or limits
prevent the frequency reference from reaching the Base Frequency.
6. Press the Lower (down) command to complete the Load Check set up process.
7. Lift the rated load numerous times to ensure there are no unwanted LC faults. If an LC alarm is detected,
increase the LC Margins (C05.05 and C05.07).
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