IMPULSE
®
•G+ & VG+ Series 4 Technical Manual
November 2020
Page 99
Table 5-30: Torque Limit Parameter Settings
This traverse torque limiter function (C07-10 and C07-11) is used in multi-VFD, closed-loop traverse applications to
reduce VFD fighting due to speed discrepancies between the two sides of a bridge. This resolves the situation
where one side of a bridge will be at full forward torque, while the other side is a full regen torque. When moving
below the Limiter Freq, this feature is disabled and the VFD behaves as normal. When accelerating past the
Limiter Freq, the ASR I time is reduced to zero to limit torque imbalance. Once the motor has accelerated to within
the Limiter Freq (i.e. 60 Hz) the regen torque limit also goes to zero. The VFD will remain in this state until the
speed reference is changed. When the speed reference is raised or lowered, regen torque is re-enabled to accel or
decel the bridge as required.
Note that a heavy swinging load may pull the bridge faster than the PG Overspeed level. It is therefore highly
suggested that a PG Overspeed Sel (F01-23) be set to Alarm Only.
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 Sets the integral time constant for the torque limit.
(OLV only)
5–10000 ms 200
C07-09 Torque Limit Sel Torque Limit Control Method Selection during Accel/
Decel
0, 1 0
0 P-ctrl @ Acc/Dec Changes to integral control at constant speed. Use
this setting when acceleration to the desired speed
should take precedence over the torque limit.
1 I-ctrl @ Acc/Dec Integral control. Set L07-07 to 1 if the torque limit
should take precedence. (OLV only)
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 Sets the frequency window (+/-) size for Traverse
Torque Limiter (C07-10) when at speed.
0.5–10.0 2.0
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