IMPULSE®•G+ & VG+ Series 4 Instruction Manual – February 2017
5-26
Load Float
When Load Float (C08-10) is enabled, it maintains the motor shaft at a stationary position with brake
open. The Load Float 2 (MFDI=35) function triggers the drive to go into Load Float for the time set in
C04-01. During Load Float, the drive will open the brake and hold the motor at a zero position. A
FWD or REV run command will take priority over this function. In NLB applications, the standard
brake checks will be performed if starting from Base Block.
Table 5-27: Load Float Time 2 Parameter Settings
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
IMPULSE
®
•G+ & VG+ Series 4 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 Alarm Speed (C05-08).
V/f Operation (A01-02 = 00)
When using Load Check II in V/f control method (during lifting) the IMPULSE
®
•G+ Series 4 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 IMPULSE
®
•G+ Series 4 will
stop the motor based on the LC Alarm Action (C05-02) and display a Load Check alarm (LC).
NOTE: If an application requires Load Check to be bypassed, an MFDI may be programmed to 69
(N.O.) or 6A (N.C.)
NOTE: It is highly recommended to use OLV or FLV control methods for Load Check II.
Parameter Display Function Range Default
C04-01 Load Float Time2 Maximum duration of Load Float 2
time when MFDI = 35
0–65535 sec 10
C04-02 Load Float Gain Load Float Gain. 0–100 10*
* Dependent on kVA (
30 HP: 10; > 30 HP: 20)
DANGER
Load Check II is designed to limit loads less than or equal to the crane’s rated capacity.
Consult the factory and crane manufacturer before calibrating Load Check II with a load
heavier than the crane capacity.
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