Siemens SINAMICS G120 Original Instructions Manual page 312

Setting functions
8.7 Application-specific functions
General properties of the bypass function
● The two motor contactors must be designed for switching under load.
● Contactor K2 must be designed for switching an inductive load.
● Contactors K1 and K2 must be mutually interlocked so that they cannot close at the same
time.
Switch off motor in bypass mode
● In bypass mode the motor no longer responds to the OFF1 command, but rather only to
OFF2 and OFF3.
● If you cut off power to the inverter in bypass mode, the bypass contactor opens and the
motor coasts down. If you want to operate the motor even when the inverter is switched
off, the signal for the bypass contactor must come from the superior controller.
Temperature monitoring and overload protection in bypass mode
● If the motor is running in bypass mode, while the inverter is in the "ready and bypass"
state (r899.0 = 1 and r0046.25 = 1), then the motor temperature monitoring via the
temperature sensor is active.
● Install the overload protection for the motor bypass mode.
Parameters for setting the bypass function
Parameter
p1260
r1261
p1262
p1263
p1264
p1265
p1266
p1267
p1269
p1274
For more information, see the parameter descriptions and function diagram 7035 in the List
Manual.
312
Description
Bypass configuration
Activating the bypass function
Bypass control/status word
Control and feedback signals for the bypass function.
Bypass dead time
Changeover time for contactors. This should be longer than the motor's de-
magnetizing time!
Debypass delay time
Delay time for switching back to inverter operation.
Bypass delay time
Delay time for switching to bypass mode.
Bypass speed threshold
Speed threshold for switching to bypass mode.
Bypass control command
Signal source for switching to bypass mode.
Bypass changeover source configuration
Switch to bypass mode using speed threshold or control signal.
Bypass switch feedback
Signal source for contactor feedback for bypass mode.
Bypass switch monitoring time
Monitoring time setting for bypass contactors.
Inverter with CU230P-2 Control Units
Operating Instructions, 11/2013, FW V4.6.6, A5E02430659B AG