5-53
A. n072 : Stall Prevention During Deceleration Factory setting: 1
(StallP Decel Sel)
Stall prevention during deceleration
automatically adjusts the deceleration
rate while monitoring the DC bus voltage
to prevent overvoltage during
deceleration.
When the motor load is large or decel
time is short, actual decel time may be
longer than the set value because of stall
prevention.
If n072 = "Enabled" (" 1 ") and a high line voltage is present (more than 10%
above drive rating), the drive may not stop when a STOP command is issued.
This parameter should be set to "Disabled" (" 0 ") if this condition is
suspected to exist.
B. n073 : Stall Prevention Level During Factory setting: See Table A3-1
Acceleration
Range: 30 - 200 %
(StallP Accel Lvl)
This parameter determines the actual drive output current level during an acceleration
condition. Set in percent of drive rated output current (see Appendix 2).
A setting of " 200 " disables stall
prevention during acceleration.
During acceleration, if the output
current exceeds the value in
n073, acceleration stops and
frequency is maintained. When
the output current goes below the
value set in n073, acceleration
resumes.
In the constant horsepower region
[actual output frequency > max.
voltage frequency (n013 )], the
stall prevention level during
acceleration is changed by the
following formula:
Stall prevention level during
=
Stall prevention level during accel
x
Max. voltage frequency
accel (constant horsepower) Actual output frequency
5.24 STALL PREVENTION
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