KEB COMBIVERT F5-A, Applications Manual, Page: 382 / 552

Page 7.13 - 8 COMBIVERT F5-A, -E, -H © KEB, 2012-10
Protective functions
7.13.1.8 Limit switch error
Hardware limit switch
The inputs assigned with the functions „32: forward“ (limit switch right) and „64: reverse“ (limit switch left) serve
as hardware limit switches. Therefore, the rotation setting via terminals (oP.01 "source of rotation direction" =
2...6) may not be used if the limit switch function is to be used.
To protect against cable breakage, an unconnected input means that the drive has run onto the limit switch.
Depending on the setting of parameter Pn.07 "Limit switch error
response", the response to the hardware limit switches can be a malfunction.
Hitting a limit switch with clockwise direction of rotation is indicated by status "46: ERROR! disabled direction of
rotation clockwise" (A.PrF) and:94 ABN. disabled direction of rotation clockwise" (A.PrF), respectively. The cor-
responding messages for counter clockwise direction of rotation are "47: ERROR! disabled direction of rotation
counter clockwise" (A.PrF) and:95 ABN. disabled direction of rotation counter clockwise" (A.Prr), respectively.
Attention: Only the limit switch for the current direction of rotation is ever evaluated, i.e., for clockwise rotation,
only the right limit switch is considered and the left limit switch is ignored. The analog applies to counter clock-
wise rotation.
Furthermore, one must ensure that the drive stops at the limit switch. If the limit switch is overrun, the drive can
subsequently continue to run in the disabled direction.
Software limit switch
The software limit switches complement the function of the hardware limit switch.
They are active only after an approach to reference point or the setting of reference points, respectively (see
chapter 7.12.2 approach to reference point).
In contrast to hardware limit switches, the software limit switches can lose their protective function by, e.g., a
faulty approach to reference point. Their advantage is that they cannot be overrun.
The permissible range of the actual position ru.54 is between PS.15 "limit switch left" and PS.16 "limit switch
right".
The software limit switches are active in the vector controlled operation, in synchronous mode, in positioning
mode, or in contouring mode.
The response to the software limit switch is set in parameter Pn.66 "soft. limit stopping mode". In the factory
setting, the software limit switches are deactivated.
Reaching the limit switch with clockwise direction of rotation is indicated by status "44: ERROR! Software limit
switch clockwise rotation" (E.SLF) and "104: ABN. Software limit switch clockwise rotation" (A.SLF), respec-
tively. The corresponding messages for counter clockwise direction of rotation are "45: ERROR! Software limit
switch clockwise rotation" (E.SLF) and "105: Software limit switch counter clockwise rotation" (A.SLr), respec-
tively.
7.13.1.9 Motor protection with temperature sensor
Parameter In.17 displays the temperature evaluation installed in the inverter. A reversible KTY / PTC detection
is installed if in In.17 = 5x hex is displayed. This can be adjusted with Pn.72 to the corresponding sensor (0 =
KTY; 1 = PTC). If no reversible detection is installed, Pn.72 has no function.
If PTC or KTY message an overtemperature, the adjusted delay time in Pn.13 "E.dOH delay time" starts. The
switching condition "9: Pre-warning motor overheating is set and the adjusted response to the pre-warning in
Pn.12 "warning dOH stop. mode" is executed. If a value of 1...5 is selected in Pn.12, the inverter displays the
malfunction „Warning! A.dOH
After expiration of the disconnecting time Pn.13, the error "Error! Motor overheating" (E.dOH) is triggered.
If the overtemperature condition is past, the message "All clear! Motor overheating" (A.ndOH) or "Motor tem-
perature back to normal" (E.ndOH) is issued. Only then the error can be reset or the automatic restart can be
carried out.