Siemens SINAMICS S120 Function Manual page 291
Drive functions
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Activation
The bypass without synchronization (p1260 = 3) can be triggered using the following signals
(p1267):
● Bypass using a control signal (p1267.0 = 1):
The bypass can be activated using a digital signal (p1266) (e.g. from a higher-level
control system). If the digital signal is withdrawn, a changeover to converter operation is
initiated once the bypass delay time (p1263) has expired.
● Bypass at a specific speed threshold (p1267.1 = 1):
Once a certain speed is reached, the system switches to bypass (i.e., the drive is used as
a starting drive). The bypass cannot be connected until the speed setpoint is greater than
the bypass speed threshold (p1265).
The system reverts to converter mode when the setpoint (on the input of the ramp-
function generator, r1119) falls below the bypass speed threshold (p1265). The setpoint >
comparison value condition prevents the bypass from being reactivated straight away if
the actual speed is still above the bypass speed threshold (p1265) after switching back to
converter operations.
The bypass time, debypass time, bypass speed variables and the command source for
changing over are set using parameters.
Parameter assignment
After activating the bypass function without synchronization (p1260 = 3) the following
parameters still have to be set:
Table 5- 5
Parameter
r1261.0 =
r1261.1 =
p1262 =
p1263 =
p1264 =
p1265 =
p1266 =
p1267.0 =
p1267.1 =
p1268
P1269[0] =
P1269[1] =
p3800 = 0
p3802 = r1261.2
Drive functions
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
Parameter settings for non-synchronized bypass function with overlap
Description
Control signal for contactor K1
Control signal for contactor K2
Setting of the dead time for non-synchronized bypass
Setting of the delay time to switch back to converter operation for non-
synchronized bypass
Setting of the delay time to switch to line operation for non-synchronized bypass
Setting of the speed threshold for activating the bypass (for p1267.1 = 1)
Setting of the signal source for the control command to the bypass
(for p1267.0 = 1)
Trigger signal setting for bypass function
Setting of the signal source for the feedback signal
"synchronization completed"
Setting of the signal source for the feedback signal of contactor K1
Setting of the signal source for the feedback signal of contactor K2
Synchronization is deactivated.
Synchronizer activation is triggered by the bypass function.
Vector control
5.22 Bypass
291
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