IMPULSE•G+/VG+ Series 4 Technical Manual
November 2022
Page 107
5.2.20 Slack Cable Detection
Slack Cable Detection is a VG+ hoist function that monitors motor torque, while running at a steady speed, and
detects when the torque suddenly dips below a set level (C11-03). When a Slack Cable condition occurs, the
output action is defined by C11-02.
Slack Cable Detection is not executed, unless both of the following conditions are true:
•
The output frequency is at a steady speed between C11-04 and C11-06.
•
The Slack Cable Detection delay time is between C11-05 and C11-07.
Setup Procedure:
•
Lower the hoist without load at a constant speed that the hoist would normally run at during operation. Record
the torque reference (U01-09). Repeat this several times to ensure an accurate reading.
•
Set C11-03 = [(U01-09)-2].
•
Enable Slack Cable Detection by setting C11-01 = 1 or 2.
•
Select output action when Slack Cable is detected by defining C11-02.
Table 5-36: Slack Cable Detection Parameter Settings
Parameter
Display
Function
Range
Default
C11-01
Slack Cable
Determines whether Slack Cable Detection is enabled.
0–2
0
0 Disabled
1 Enabled
2 Enabled by MFDI
C11-02
Action at SLC
Action and allowable motion when Slack Cable is detected.
RAISE command is permitted (MFDO = 28).
0–5
2
0 No Action
Alarm Only
1 No Act/C3-04
Next LOWER command is at LL1 speed C03-04.
2 Decel/C3-04
Decel (by C03-05) to LL1 Speed
C03-04. LOWER limited to C03-04.
3 Decel/No Opr
Decel (by C03-05) to LL1 Speed
C03-04. LOWER not allowed.
4 Dec Stop/C3-04
Decel (by C03-06) to stop. LOWER limited to C03-04.
5 Dec Stop/No Opr
Decel (by C03-06) to stop. LOWER not allowed.
C11-03
SLC Detect Torq
Percentage of Output Torque below which Slack Cable
Detection is activated-as long as the motor speed is
between C11-04 and C11-06, and the delay time is
between C11-05 and C11-07.
-50–100%
30
C11-04
SLC Detect Spd 1
Frequency Output that is required for Slack Cable
Detection to be activated. It corresponds to Slack Cable
Detection Delay Time 1 (C11-05).
0–E01-04 Hz
2
C11-05
SLC Delay Time 1
Delay time before Slack Cable Detection can be activated.
Corresponds to Slack Cable Detect Speed 1 (C11-04).
Prevents false outputs.
0.00–2.55 sec
0.50
C11-06
SLC Detect Spd 2
Frequency Output below which Slack Cable Detection can
be activated. It corresponds to Slack Cable Detection
Delay Time 2 (C11-07).
0–E01-04 Hz
60
C11-07
SLC Delay Time 2
Delay time before Slack Cable Detection can be activated. It
corresponds to Slack Cable Detection Speed 2 (C11-06).
Prevents false outputs.
0.00–2.55 sec
0.10
