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Function library

Function blocks

3.2.40 Mains failure control (MFAIL)

3−120

EDSVS9332S−EXT EN 2.0

3. Increase of the deceleration time or reduction of the brake torque (see Fig. 3−104) is only

possible with restrictions:

– An increase of the acceleration time MFAIL T

(C0982) reduces the initial brake torque and

increases the deceleration time.

– Increasing the integral−action time MFAIL T

(C0981) decreases the braking torque and

simultaneously increases the deceleration time. If C0981 contains too high integral−action

times, the controller runs into the LU threshold before speed 0 is reached. Thus, the drive is

not controlled anymore.

4. Re−establish possibly required signal connections to the outputs of the controller (terminals

X6).

) Note!

All settings must be saved non−volatile in a parameter set under C0003.

3.2.40.3 Restart protection

The integrated restart protection is to avoid a restart in the lower speed range, after the supply voltage

was interrupted for a short time only (mains recovery before the drive has come to standstill).

l How to protect the drive from restart is explained in chapter 3.2.40.2.

l Go to C0472/18 and enter the threshold in [%] of nmax (C0011) if you do not want an

automatic restart below this threshold after mains recovery.

– Speed at mains recovery < threshold in C0472/18: Drive is continued to be braked in a

controlled way. This function can only be completed by MFAIL−RESET = HIGH.

– Speed after mains recovery > threshold in C0472/18 Drive accelerates to its setpoint along

the set ramps.

l The function is deactivated by:

– C0472/18 = 0 % or

– C0975 = 1000 (FIXED0% to MFAIL−THRESHLD)

l Reset with MFAIL−RESET = HIGH

– is required after every mains connection

– is displayed by MFAIL−STATUS = HIGH, if MFAIL−FAULT = LOW

3.2.40.4 Reset of the mains failure control

l The mains failure control is reset with MFAIL−RESET = HIGH (in the example with terminal

X5/E5).

l The reset pulse is always required if:

– the restart protection is active.

– the restart protection is used and the supply (mains or DC supply) was switched on.

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