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Vector control 4.20 Bypass

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Figure 4-28 Circuit example, bypass without synchronization

Activating

The bypass without synchronization (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 If the digital signal is withdrawn again after the debypass delay time has expired (p1263), then a changeover is made to drive converter operation.

●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.

The following signal diagram shows the timing when the bypass switch is on when activating "bypass for fault".

Example

After activating the bypass function without synchronization (p1260 = 3) the following parameters still have to be set:

Drive Functions	165
Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4