INVT Goodrive350-19 Series Operation Manual page 347

Goodrive350-19 Series VFD for Crane
Function
Name
code
Zero servo
P93.02 protection mode
and reset
Slow lowering
P93.03 frequency at zero
servo
Description
detected. If the encoder feedback frequency is
close to the brake release frequency, which
lasts the time specified by P93.01, the brake
failure fault (bE) is reported.
For details, see the torque verifying and brake
slip descriptions
commissioning section.
0x00–0x23
Ones place: Zero servo protection mode
selection
0: Disable zero servo
1: Lower slowly when zero servo is switched on
2: Zero servo input is always valid (keep
running at zero speed)
3: Lower slowly
maintenance time is reached
Tens place: Brake failure protection reset
method
0: Only for downward running
1: Both for upward and downward running
2: Only for reset commands
Note:

At certain faults that cannot be reset, such
as VFD internal hardware damaged, zero
servo cannot be entered. At the faults that
can be reset, with zero servo conditions
met, zero servo can be entered.

Every time zero servo is exited, torque
verification is not performed only at the first
running command giving, which means the
verification is performed at all the following
running command giving.

When P93.02 ones place=2, the motor
becomes hot, the fan cannot be mounted at
the same shaft as the motor, and it must be
independently controlled.
The zero servo function needs to be used in
closed-loop vector control. During stop, the
VFD checks whether the pulse value is greater
-335-
in the brake function
when the zero
Function parameters
Default Modify
speed
0x00
4.00Hz
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