IMPULSE•G+/VG+ Series 4 Technical Manual
November 2022
Page 95
Table 5-30: Torque Limit Parameter Settings
The Traverse Torque Limiter function (C07-10 and C07-11) is used in multi-VFD, closed-loop traverse applications
to reduce skewing due to speed differences in the motors on each side of a bridge. This prevents one side of a
bridge being at full forward torque, while the other side is at full regen torque, which can lead to skewing, DEV
faults, or the motors simply not sharing the load sufficiently. When accelerating past the Limiter Freq (C07-11), this
feature is enabled, and the ASR I time is reduced to zero to limit torque imbalance. Once the motor has reached its
target speed, the regen torque limit is also reduced to zero. It will remain in this state until the speed reference is
changed. When the speed reference is raised or lowered, regen torque limit is re-enabled to accel or decel the
bridge as required.
Parameter
Display
Function
Range
Default
C07-01
Trq Limit FWD
FORWARD torque limit
0–300%
150
C07-02
Trq Limit REV
REVERSE torque limit
0–300%
150
C07-03
Trq Lmt FWD Rgn
Regenerative torque limit at FORWARD
0–300%
180
C07-04
Trq Lmt REV Rgn
Regenerative torque limit at REVERSE
0–300%
180
C07-05
T-Lim FWD Gain
Torque Limit gain in FWD direction when MFDI = 14
is ON. Gain is applied to C07-01. If T-Lim by Analog
Input is used, gain is applied to post-scaled/biased
input.
0.00–2.55
1.25
C07-06
T-Lim REV Gain
Torque Limit gain in REV direction when MFDI = 14
is ON. Gain is applied to C07-02. If T-Lim by Analog
Input is used, gain is applied to post-scaled/biased
input.
0.00–2.55
1.25
C07-07
T-Lim RGN Gain
Torque Limit gain in RGN mode when MFDI = 14 is
ON. Gain is applied to C07-03 and C07-04. If T-Lim
by Analog Input is used, gain is applied to post-
scaled/biased input.
0.00–2.55
1.25
C07-08
Trq Lim I Time
Integral time constant for the torque limit. (OLV only)
5–10000 ms
200
C07-09
Torque Limit Sel
Torque Limit Method during Accel/Decel (OLV only)
0, 1
0
0 P-ctrl @ Acc/Dec
The torque limit uses proportional control during
accel and decel, and switches to I control at constant
speed. Use this setting when getting to the desired
speed has priority over the torque limit.
1 I-ctrl @ Acc/Dec
The torque limit will always use integral control. Use
this when a highly accurate torque limit is required
during speed changes. This setting may increase
the acceleration time, or prevent the motor from
reaching the frequency reference if the torque limit is
reached first.
C07-10
Trav Trq Limiter
ASR I time is forced to 0 when the output frequency
is greater than the C07-11 speed window. When
using this feature, it is suggested that the Overspeed
Detect Level (F01-24) be increased to 110% to avoid
overspeed faults.
0, 1
0
0 Disabled
1 Enabled
C07-11
Limiter Freq
Frequency window (+/-) size for Traverse Torque
Limiter (C07-10) when at speed.
0.5–10.0
2.0
