Operation Mode Is Not Changed Properly; Motor Current Is Too Large - Mitsubishi Electric FR-E700 Instruction Manual

Check first when you have troubles
7.6.9

Operation mode is not changed properly

Check Points
Input signal
Parameter
setting
7.6.10 Operation panel display is not operating
Check Points
Main circuit
Control circuit
Parameter
setting
7.6.11

Motor current is too large

Check Points
Parameter
setting
7 - 28
Possible Cause
Start signal (STF or STR) is ON.
Pr. 79 setting is improper.
Operation mode and a writing device do not
correspond.
Possible Cause
Wiring or installation is improper.
Power is not input.
Command sources at the PU operation mode
is not be the operation panel.
(None of the operation mode displays
( ) is lit.)
Possible Cause
Torque boost (Pr. 0, Pr. 46) setting is improper
under V/F control, so the stall prevention
function is activated.
V/F pattern is improper when V/F control is
performed. (Pr. 3, Pr. 14, Pr. 19)
Stall prevention function is activated due to a
heavy load.
Auto tuning is not performed under
Advanced magnetic flux vector control or
General-purpose magnetic flux vector
control.
Countermeasures
Check that the STF and STR signals are OFF.
When either is ON, the operation mode can-
not be changed.
When the Pr. 79 "Operation mode selection"
setting is "0" (initial value), the inverter is
placed in the external operation mode at
input power-on. At this time, press the PU/
EXT key on the operation panel (press the PU
key when the parameter unit (FR-PU04/FR-
PU07) is used) to switch to the PU operation
mode. For other values (1 to 4, 6, 7), the oper-
ation mode is limited accordingly.
Check Pr. 79, Pr. 338, Pr. 339, Pr. 550, Pr. 551,
and select an operation mode suitable for
the purpose.
Countermeasures
Check for the wiring and the installation.
Make sure that the connector is fitted
securely across terminal P/+ and P1.
Input the power.
Check the setting of Pr. 551 "PU mode opera-
tion command source selection". (If parame-
ter unit (FR-PU04/FR-PU07) is connected
while Pr. 551 = "9999" (initial setting), all the
operation mode displays (
turn OFF.)
Countermeasures
Increase/decrease Pr. 0 "Torque boost" set-
ting value by 0.5% increments to the setting.
Set rated frequency of the motor to Pr. 3
"Base frequency". Use Pr. 19 "Base frequency
voltage" to set the base voltage (e.g. rated
motor voltage).
Change Pr. 14 "Load pattern selection"
according to the load characteristic.
Reduce the load weight.
Set Pr. 22 "Stall prevention operation level"
higher according to the load. (Setting Pr. 22
too large may result in frequent overcurrent
trip (E.OC ).)
Check the capacities of the inverter and the
motor.
Perform offline auto tuning.
Troubleshooting
Refer to
Page
6-206
6-206
6-206,
6-220
Refer to
Page
3-4
3-4
6-220
)
Refer to
Page
6-35
6-56
6-58
—
6-44
—
6-90