KEB COMBIVERT F5-A, Applications Manual, Page: 251 / 552

Torque display and -limiting
© KEB, 2012-10 COMBIVERT F5-A, -E, -H Page 7.8 - 13
7
5: external PID
output (ru.57)
the output value of the PID controller (see section 7.15) is the factor for the torque limits
(cS.19...cS.23)
The output value can be read out in ru.57
6: AN2 direct
(+/- 10V)
Analog input value AN2 is the factor for the torque limits (cS.19...cS.23). The analog input
is scannned and processed in faster steps with this adjustment. To realize this faster pro-
cessing, the following parameters do not have any function: „AN2 noise filter“ (
An.11), „AN2
offset Y“ (An.17), „AN2 zero clamp“ (An.14), „AN2 save mode“ (An.12). The value of AN2 is
limited as multiplier to 100%.
Example: cS.20 torque limit forward motor = 20Nm
cS.21 torque limit reverse motor = 20Nm
cS.22 torque limit forward regen. = 15Nm
cS.22 torque limit reverse regen. = 10Nm
cS.15 torque reference source = 3: digital % (cS.18)
cS.18 torque reference setting = 50%
resulting torque limits
forward rotation: motorized = 10Nm / regenerative = 7.5Nm
Counter clock-
wise rotation: motorized = 10Nm / regenerative = 5Nm
This limits can be lowered by the limiting characteristic.
Different setting of the motor and regenerative torque limit via An.54
The parameter value of cS.19…cS.23 can be changed in 1 ms step with An.54 and e.g. an analog input. This
provides the possibility e.g. to change the motor limit analog and to keep the regenerative limit constant.
cS.19 is the reference torque if the actual torque is output via an analog output. Here it makes sense to keep
cS.19 constant and to change cS.20…cS.23.
Since the selection in standstill if regenerative or motorized operating mode is depending on the actual speed,
different setting can cause torque jumps when the torque limit is reached.
7.8.5 Display of actual torque values and limits
Parameter ru.11 and ru.12 display the actual set torque or actual torque of the drive.
The torque in [%] referring to parameter "absolute torque reference" (cS.19) is displayed in ru.73 and ru.74.
The effective limits for the actual direction of rotation can be read in parameters ru.47 "act. torque limit mot."
and ru.48 "act. torque limit regen.". Parameters ru.47 and ru.48 are depending on the programmed torque li-
mits, the limiting characteristic and current limits (e.g. hardware current limit or dr.37 "max. current).