Omron SYSDRIVE 3G3RV, User Manual

Page: 382 / 446

7
-20
The torque limit has been reached.
When
a torque limit has been set in parameters L7-01 to L7-04, no torque will be output beyond that limit.
This
can cause the deceleration time to be too long. Check to be sure that the value set for the torque limit is
suitable.
If
torque limits have been set for the multi-function analog input terminal A2 Function H3-09 (set value: 10 to
12
or 15), check to be sure that the analog input value is suitable.
n
If the Vertical-axis Load Drops When Brake Is Applied
The
following causes are possible.
There is a fault in the sequence.
The
sequence is incorrect. The Inverter goes into DC injection braking status for 0.5 seconds after deceleration
is
completed. (This is the factory-set default.)
To
ensure that the brake holds, set frequency detection 2 (H2-01 = 5) for the multi-function contact output ter-
minals
(M1 and Mw) so that the contacts will turn OFF when the output frequency is greater than L4-01 (3.0
to
5.0 Hz). (The contacts will turn ON below L4-01.)
There
is hysteresis in frequency detection 2 (i.e., a frequency detection width, L4-02 = 2.0 Hz). Change the
setting
to approximately 0.5 Hz if there are drops during stop. Do not use the multi-function contact output run
signal
(H2-01 = 0) for the brake ON/OFF signal.
DC braking is insufficient.
If
the DC braking power is insufficient, increase the b2-02 setting (DC injection braking current).
The wrong brake is being used.
Use
the main brake rather than the holding brake.
K
K K
K
If the Motor Overheats
Take
the following steps if the motor overheats.
n
The load is too big.
If
the motor load is too heavy and the motor is used with the effective torque exceeding the motor's rated
torque,
the motor will overheat. Some motor ratings are given for short period performance and are not contin-
uous
ratings. Reduce the load amount by either lightening the load or lengthening the acceleration/decelera-
tion
time. Also consider increasing the motor capacity.
n
The ambient temperature is too high.
The
motor rating is determined within a particular ambient operating temperature range. The motor will burn
out
if it is run continuously at the rated torque in an environment in which the maximum ambient operating
temperature
is exceeded. Lower the motor's ambient temperature to within the acceptable ambient operating
temperature
range.
n
The withstand voltage between the motor phases is insufficient.
When
the motor is connected to the Inverter output, a surge is generated between the Inverter switching and
the
motor coil. Normally the maximum surge voltage is three times the Inverter's input power supply voltage