Lenze 9325 - Reset of the Mains Failure Control; Restart Protection

Function block library
7-156

SHB9300CRV EN 2.0
t
UG
t1
t2
t
n
0
0
C M P 2 -O U T
M FAIL-DC-SET
t3
O
perating threshold
Sw itch-off threshold O U
Sw itch-on threshold brake unit
Sw itch-off threshold LU
Fig. 7-116 Schematic with different brake torques
t = t1 Mains failure
t = t2 Zero speed with higher brake torque (short adjustment time)
t = t3 Drive reache s the LU switch-off threshold with lower brake torque (high adjustment time),
without reaching zero speed
t > t3 Drive is no longer co ntrolled (is braked by frictio n)
7.6.48.3 Restart protection
Theintegrated restart protectionis to avoid a restart in thelower speed range,afterthesupplyvoltage
was interrupted for a short time only (mains recovery be fore the drive has come to standstill).
l For establishing the restart protection see item 6. in chapter 7.6.48.2.
l Under C0472/18, enter the threshold in [%] if nmax (C0011) below which no automatic start is
wished after mains recovery.
– Speed after mains recovery < threshold in C0472/18: Drive is still 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
7.6.48.4 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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