Efficient Networks Siemens Sinamics S120 - Manual (Page 164)

Vector control
4.20 Bypass
Drive Functions
164
Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4
Example
The following parameters must be set after the bypass function with synchronization without
overlap (p1260 = 2) has been activated.
Table 4-9 Parameter settings for bypass function with synchronization without overlap
Parameter Description
p1266 = Control signal setting when p1267.0 = 1
p1267.0 = 1
p1267.1 = 0
Bypass function is initiated by the control signal.
P1269[0] = Signal source to provide the feedback signal of contactor K1
P1269[1] = Signal source for contactor K2 feedback
p3800 = 1 The internal voltages are used for synchronization.
p3802 = r1261.2 Synchronizer activation is triggered by the bypass function.
4.20.3 Bypass without synchronization (p1260 = 3)
Description
When the motor is transferred to the line supply, contactor K1 is opened (after the drive
converter pulses have been inhibited); the system then waits for the motor de-excitation time
and then contactor K2 is closed so that the motor is directly connected to the line supply.
When the motor is switched on in a non-synchronized manner, an equalizing current flows
that must be taken into account when the protective equipment is designed.
When the converter retrieves the motor from the line supply, initially contactor K2 is opened,
and after the excitation time has expired, contactor K1 is closed. The drive converter then
connects to the rotating motor and the motor is fed from the drive converter.
In this case, contactor K2 must be designed/selected to be able to switch inductive loads.
Contactors K1 and K2 must be interlocked so that they cannot simultaneously close.
The "flying restart" function must be activated (p1200).