Lenze EVF9383 - Manual (Page 133)

Configuration
2−125
l
EDSVF9383V−EXT EN 2.0
t
U G
t 1 t 2
t
n
0
0
M F A I L - D C - S E T
t 3
Q
R
S
T
Fig. 2−98 Schematic representation with different brake torques
 Switch−off threshold OU
‚ Switch−on threshold for brake unit
ƒ Switch−off threshold LU
„ Threshold CMP2−OUT
t = t1 Mains failure
t = t2 Zero speed with higher brake torque (short adjustment time)
t = t3 Drive reaches the LU switch−off threshold with lower brake torque (high adjustment time), without reaching zero
speed
t > t3 Drive is no longer under control (is braked by friction)
2.4.41.3 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 Establish the restart protection. (
¶ 2−118, point 6.)
l In C0472/18, enter the threshold in [%] of n
max
(C0011) below which no automatic start is
wanted after mains recovery.
– If the speed at mains recovery < threshold in C0472/18, the drive will still be braked under
control. This function can only be ended by MFAIL−RESET = HIGH.
– If the speed at mains recovery > threshold in C0472/18, the drive accelerates to its setpoint
along the set ramps.
l This function is deactivated by:
– C0472/18 = 0 % or
– C0975 = 1000 (FIXED0% to MFAIL−THRESHLD)
l A reset is made by MFAIL−RESET = HIGH:
– A reset is required after every mains (re)connection
– The reset is shown by MFAIL−STATUS = HIGH, when MFAIL−FAULT = LOW.