MITSUBISHI ELECTRIC FR-S520 - Manual (Page 94)

85
2
Refer to the following table and set the parameters:
Parameter Setting Description
0.1K to
1.5K
Coasting time of 0.5s
0
2.2K,
3.7K
Coasting time of 1.0s
Generally, this setting will
pose no problems.
0.1 to 5s
Waiting time for inverter-triggered restart after power is
restored from an instantaneous power failure. (Set this time
between 0.1 and 5s according to the inertia moment (J) and
torque of the load.) 57
- - - No restart
58 0 to 60s
Normally the motor may be run with the factory settings. These
values are adjustable to the load (inertia moment, torque).
CAUTION Instantaneous power
failure (power failure) time
Power supply
(R
1
>,
S, T)
STF(STR)
Motor speed
(r/min)
Inverter output
frequency
(Hz)
Inverter output
voltage
(V)
Coasting time
Pr. 57 setting
Restart
voltage
rise time
Pr. 58 setting
Automatic restart operation after
instantaneous power failure is a
reduced voltage starting system in
which the output voltage is risen
gradually at the preset frequency
independently of the coasting speed
of the motor.
It is a system which outputs the
output frequency before an
instantaneous power failure, unlike
the motor coasting speed detection
system (speed search system) used
by the FR-E
500
series Mitsubishi
transistorized inverters. Hence, if
the instantaneous power failure time
is 0.2s or longer, the frequency
before an instantaneous power
failure cannot be stored in memory
and the inverter restarts at 0Hz.
The SU and FU signals are not
output during a restart. They are
output after the restart cushion time
has elapsed.
CAUTION
When automatic restart after instantaneous power failure has been selected,
the motor and machine will start suddenly (after the restart coasting time has
elapsed) after occurrence of an instantaneous power failure. Stay away from
the motor and machine.
When you have selected automatic restart after instantaneous power failure,
apply in easily visible places the CAUTION seals supplied to the instruction
manual (basic).
The motor is coasted to a stop as soon as you turn off the start signal or press
the
STOP
RESET
key during the restart cushion time after instantaneous power failure.