Mitsubishi Electric Freqrol-A100 Instruction Manual page 112

Pr. 67
-
Pr. 71
Note: The setting range of 0 to 10, 9999 is displayed on the setting
display screen of the PU. 101 to 110 is not displayed.
A waiting time between inverter alarm occurrence and restart
can be set in Pr. 68 in the range 0 to 10 seconds.
By reading the value of Pr. 69, the cumulative number of restart
times made by retry is provided. The set value of "0" erases the
8
x,*
*
llr.ya*F.
Pr. 67 "number of retries at trip occurrence" '
k o
use t h e j e t r ' $ f u n c t i ~ n $ ~
,;
,
r,:l
Q
Pr. 68-"retry waiting time"
Pr. 69 "retry count display erasure"
Retry is a function which causes the inverter to automatically
reset a trip at its occurrence, make a restart, and continue
operation.
In Pr. 67, set the number of retries at trip occurrence.
cumulative number of'times
Note: 1. Since the inverter automatically starts operation after the
retry waiting time set in Pr. 68 has elapsed, this function
must be used with care so as not to jeopardize the operator.
2. The cumulative number in Pr. 6 9 is incremented by "1" when
retry operation is regarded as successful, i.e. when normal
operation is continued without any alarm occurring during a
.
period four time longer than the time set in Pr. 68 "retry
waiting time" after the start of the retry.
3. If alarms have occurred successively during the above
period four time longer than the waiting time setting, different
displays may be provided on the inverter LED and PU; the
most recent display on the inverter LED and the first retry
display on the PU.
For errors occurring at retries, the definition of only the alarm
that occurred at the first retry is stored.
4. When the inverter trip is reset at the restart time, the data of
the electronic overcurrent protection, etc. is not reset.
(Different from the power-on reset.)
Alarmm Signal Output
-
Not output.
Output.
Pr. 67 Set Value
0 (factory settmg)
1 to 10
101 to 110
Pr.
0
"torque boost (manual), Pr.
3
"base frequency"
Number of Retries
Retry
IS
not made.
1 to -1 0 times
1 to 10 tlmes
motor
Mitsubishi's old constant-torque motor (SF-JRC) can be run
continuously at 100% torque down to low speed. Without requir-
ing the load torque to be reduced at low speed, they can b e run
continuously at constant torque (1 00% torque) within the range
of a 111 0 speed ratio (6 to 60Hz).
When Mitsubishi's old constant-torque motor is used, the set-
tings of the following parameters must be changed:
Pr. 0 "torque boost (manual)"
7.5K and down-4%, 1 1 K and up-2% .............................
Pr.
3
"base frequency" ........ 60Hz (factory setting)
.
Pr.
9
"electronic overcurrent protection"
............................. rated current of motor
.........
Pr. 71 "applied motor"
set value "1"
motor output current is larger than that of the standard motor.
2. When two or more constant-torque motors are run synchro-
nously, they are liable to cause torque imbalance because
of their smaller slip than the standard motors.
-
97-