Operating instructions

Functions, monitoring, and protective functions
9.4 Extended functions
Drive converter cabinet units
Operating Instructions, 10/2008, A5E00288214A
351
Activation
The bypass with synchronizer (p1260 = 3) can be triggered by the following signals (p1267):
● Bypass by means of control signal (p1267.0 = 1):
The bypass can be activated by means of a digital signal (p1266) (e.g. from a higher-level
automation system). If the digital signal is canceled, a changeover to converter
operations is triggered once the debypass delay time (p1263) has expired.
● Bypass at speed threshold (p1267.1 = 1):
Once a certain speed is reached, the system switches to bypass (i.e. the converter is
used as a start-up converter). 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.
Parameterization
Once the bypass without synchronizer (p1260 = 3) function has been activated, the following
parameters must be set:
Table 9- 8 Parameter settings for bypass function with synchronizer without degree of overlapping
Parameter Description
p1262 = Bypass dead time setting
p1263 = Debypass dead time setting
p1264 = Bypass delay time setting
p1265 = Speed threshold setting when p1267.1 = 1
p1266 = Control signal setting when p1267.0 = 1
p1267.0 =
p1267.1 =
Trigger signal setting for bypass function
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.
P1200 = 1 The "flying restart" function is always active.
9.4.2.4 Function diagram
FP 7020 Synchronization