Mitsubishi Electric F700 Instruction Manual page 136

Operation selection at power failure and
instantaneous power failure
When Pr. 162 = 1, 11 (without frequency search)
Instantaneous (power failure) time
Power supply
(R/L1,S/L2,T/L3)
Motor speed N
(r/min)
Inverter
output frequency
f (Hz)
Inverter
output voltage
E (V)
Coasting time
Pr. 57 setting
* The output shut off timing differs according
to the load condition.
(4) Restart coasting time (Pr. 57)
⋅ Coasting time is the time from when the motor speed is detected until automatic restart control is started.
⋅ Set Pr. 57 to "0" to perform automatic restart operation. The coasting time is automatically set to the value below.
Generally this setting will pose no problems.
1.5K or less...... 0.5s, 2.2K to 7.5K ..... 1s, 11K to 55K..... 3.0s, 75K or more .....5.0s
⋅ Operation may not be performed well depending on the magnitude of the moment of inertia(J) of the load or
operation frequency. Adjust the coasting time between 0.1s and 5s according to the load specifications.
(5) Restart cushion time (Pr. 58)
⋅ Cushion time is the length of time taken to raise the voltage appropriate to the detected motor speed (output frequency prior
to instantaneous power failure when Pr. 162 = "1" or "11).
⋅ Normally the initial value need not be changed for operation, but adjust it according to the magnitude of the moment of
inertia(J) of the load or torque magnitude.
Voltage
100%
Pr.164
(Pr.163)
CAUTION
⋅ The signal can be assigned to the input terminal using any of Pr. 178 to Pr. 189 (Input terminal function selection). When terminal
assignment is changed, the other functions may be affected. Please make setting after confirming the function of each terminal.
⋅
When automatic restart operation is selected, undervotage protection (E.UVT) and instantaneous power failure protection
(E.IPF) among the alarm outut signals will not be provided at occurrence of an instantaneous power failure.
⋅
The SU and FU signals are not output during a restart. They are output after the restart cushion time has elapsed.
⋅
Automatic restart operation will also be performed after a reset made by an inverter reset is canceled or when a retry is made
by the retry function.
128
*
Restart cushion
time
Pr. 58 setting
(6) Automatic restart operation adjustment (Pr. 163 to
Pr.58 Time
Without frequency search
When Pr. 162 = "1, 11", automatic restart operation is performed in a
reduced voltage system, where the voltage is gradually risen with
the output frequency unchanged from prior to an instantaneous
power failure independently of the coasting speed of the motor.
REMARKS
⋅ This system stores the output frequency prior to an instantaneous
power failure and increases the voltage. Therefore, if the
instantaneous power failure time exceeds 0.2s, the inverter starts at
Pr. 13 Starting frequency (initial value = 0.5Hz) since the stored output
frequency cannot be retained.
Restart operation at every start
When Pr. 162 = "10" or "11", automatic restart operation is
also performed every start, in addition to the automatic restart
after instantaneous power failure. When Pr. 162 = "0",
automatic restart operation is performed at the first start after
power supply-on, but not performed at the second time or
later.
Pr. 165, Pr. 611)
⋅ Using Pr. 163 and Pr. 164, you can adjust the voltage rise time at a
restart as shown on the left.
⋅ Using Pr. 165, you can set the stall prevention operation level at a
restart.
⋅ Using Pr. 611, you can set the acceleration time until the set
frequency is reached after automatic restart operation is performed
besides the normal acceleration time.
REMARKS
⋅ If the setting of Pr. 21 Acceleration/deceleration time increments is
changed, the setting increments of Pr. 611 does not change.