Function block library
7-155

SHB9300CRV EN 2.0
UG
t1 t2
n
0
0
CMP2-OUT
M FAIL-DC-SET
O perating threshold
Sw itch-off threshold O U
Sw itch-on threshold brake unit
Sw itch-off threshold LU
Fig. 7-115 Schematic representation with activated mains failure control ( ideal characteristic)
t1 Mains failure
t2 Zero speed reached
Fine setting
Repeat the following steps several times.
1. Obtain a very low final spee d be for e the controller reache s the undervoltage threshold LU:
– Increase the proportional gain M FAIL V
p
(C0980).
– Reduce the adjustment time MFAIL T
n
(C0981).
2. Avoid activation of the brake unit or the overvoltage threshold:
– Increase the adjustment time MFAIL T
n
(C0981)until the characteristic in Fig. 7-115 is almost
reached.
– Reduce additionally the setpoint of the DC bus voltage at the input MFAIL-DC-SET (in the
example C0472/19), if necessary.
3. Increase of the deceleration time or reduction of the brake torque (see Fig. 7-116)is only
possible with restrictions:
– An increase of the acceleration time MFAIL T
ir
(C0982)reduces the initial brake torque and
increases the deceleration time.
– An increase of the adjustment time MFAIL T
n
(C0981)reduces the brake torque and
increases the deceleration time. If the adjustment times under C0981 are too long, the
controller reaches the LU threshold before zero speed is reached. The drive is therefore no
longer controlled.
4. Re-establish signal connections which may be used, to the outputs of the controller (terminals
X6).
Tip!
All settings must be saved non-volatile in a parameter set under C003.
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