Siemens SINAMICS G120 CU230P-2 HVAC Operating Instructions Manual page 270

Functions
7.9 Application-specific functions
General properties of the bypass function
● y
● Contactors K1 and K2 must be mutually interlocked so that they cannot close at the same
Shutdown behavior in bypass operation
● If the motor is in the bypass mode, it cannot be shutdown with OFF 1. The motor coasts
● If the motor is running in the bypass mode and the inverter is disconnected from the line
Temperature monitoring and overload protection in the bypass mode
● If the motor is running in the bypass mode, while the inverter is in the "ready and bypass"
● If the motor is running in the bypass mode, while the inverter is in the "ready and bypass"
Parameters for setting the bypass function
Parameter
p1260
r1261
p1262
p1263
p1264
p1265
p1266
p1267
p1269
p1274
For more details about parameters, please refer to the List Manual.
268
time.
down after an OFF2 or OFF3.
supply, then also the bypass contactor does not receive control signals from the inverter
and the motor coasts down. If the motor is to continue running once the inverter is
switched off, the signal for the bypass contactor must therefore come from the higher-
level control.
state (r899.0 = 1 and r0046.25 = 1), then the motor temperature monitoring via the
temperature sensor is active.
state (r899.0 = 1 and r0046.25 = 1), then the overload protection for the motor must be
realized on the plant or system side.
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
demagnetizing time!
Debypass delay time
Delay time for switching back to inverter operation.
Bypass delay time
Delay time for switching to bypass operation.
Bypass speed threshold
Speed threshold for switching to bypass operation.
Bypass control command
Signal source for switching to bypass operation.
Bypass changeover source configuration
Switch to bypass operation using speed threshold or control signal.
Bypass switch feedback
Signal source for contactor feedback for the bypass mode.
Bypass switch monitoring time
Monitoring time setting for bypass contactors.
Frequency inverters with Control Units CU230P-2 HVAC, CU230P-2 DP, CU230P-2 CAN
Operating Instructions, 01/2011, FW 4.4, A5E02430659B AD