Mitsubishi Electric fr-e700 series, Instruction Manual

Page: 249 / 608

Parameter Selection and protection of a motor
FR-E700 SC EC/ENE 6 - 95
If offline auto tuning ended in error (see the table below), motor constants are not set. Perform an in-
verter reset and restart tuning.
When tuning is ended forcibly by pressing the STOP/RESET key or turning off the start signal (STF or
STR) during tuning, offline autotuning does not end normally. (The motor constants have not been
set.) Perform an inverter reset and restart tuning.
When using the motor corresponding to the following specifications and conditions, reset Pr. 9 Elec-
tronic thermal O/L relay as below after tuning is completed.
●
When the rated power specifications of the motor is 200/220 V(400/440 V) 60 Hz, set 1.1 times
rated motor current value in Pr. 9.
●
When performing motor protection from overheat using a PTC thermistor or motor with temper-
ature detector such as Klixon, set "0" (motor overheat protection by the inverter is invalid) in Pr. 9.
Pr. 96 Setting Error Cause Remedy
8 Forced end Set "1" or "11" in Pr. 96 and perform tuning again.
9 Inverter protective function operation Make setting again.
91
Current limit (stall prevention) function was acti-
vated. Set "1" in Pr. 156.
92
Converter output voltage reached 75% of rated
value. Check for fluctuation of power supply voltage.
93
– Calculation error
– A motor is not connected. Check the motor wiring and make setting again.
Set the rated current of the motor in Pr. 9.
Tab. 6-15: Parameter 96 setting
NOTES
The motor constants measured once in the offline auto tuning are stored as parameters and their
data are held until the offline auto tuning is performed again.
An instantaneous power failure occurring during tuning will result in a tuning error. After power is
restored, the inverter goes into the normal operation mode. Therefore, when STF (STR) signal is on,
the motor runs in the forward (reverse) rotation.
Any alarm occurring during tuning is handled as in the ordinary mode. Note that if a fault retry has
been set, retry is ignored.
E
CAUTION:
As the motor may run slightly, fix the motor securely with a mechanical brake or make sure that
there will be no problem in safety if the motor runs (caution is required especially in elevator).
Note that tuning performance is unaffected even if the motor runs slightly.