Siemens SINAMICS S120 Function Manual page 281

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Supplementary conditions

The following supplementary conditions apply to the use of the bypass function:

● The bypass switch is also always shut down if one of the control word signals OFF2 or OFF3

is canceled and the motor coasts down. If the control word signal OFF1 is withdrawn, the

motor remains connected to the supply system.

If necessary, the bypass switch can be interlocked by a higher-level controller such that the

converter can be shut down completely (i.e. including the controller electronics) while the

motor is operated on the supply. The contactor interlocking should be implemented on the

plant/system side.

● When the drive is started up again after POWER ON, the status of the bypass contactors is

evaluated. After powering up, the converter can thereby change straight into "Ready to start

and bypass" status. This is only possible if the bypass is activated via a control signal, the

control signal (p1266) is still present once the system has been ramped up, and the

"Automatic restart" function (p1210 = 4) is active.

The bypass is automatically started again when restarting. To accelerate the motor to the

setpoint speed or to synchronize it to the network, the pulse enable may takes place with the

motor rotating. In this case, it is recommended that you activate the "Flying restart" function

(p1200 = 1). This prevents high current peaks.

● Changing the converter into "Ready to start and bypass" status after powering up, is of a

higher priority than switching back on automatically.

● Monitoring of the motor temperatures using temperature sensors is active while the

converter is in one of two states "Ready to start and bypass" or "Ready for operation and

● The two motor contactors must be designed for switching under load.

The application examples contained in the following descriptions are only basic circuits

designed to explain the basic principle of operation. The dimensions of specific circuit

configurations (contactors, protective equipment) must be calculated for specific systems.

Commissioning the function

The bypass function is part of the function module "technology controller" that can be activated

when using the commissioning wizard. Parameter r0108.16 indicates whether it has been

Drive functions

Function Manual, 06/2019, 6SL3097-5AB00-0BP2

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