Geared Motor - Mitsubishi Electric FR-A700 Technical Manual

3.3.9

Geared motor

Geared motors differ in the continuous-duty speed range
according to the lubrication system and manufacturer.
Particularly with oil lubrication, continuous operation only in
the low speed range can cause gear seizure. When
performing high-speed operation beyond 60Hz, please
consult the manufacturer.
(1) Mitsubishi standard geared motors
The grease-lubricated GM-S, GM-D and GM-LJ may
be used between low speed and high speed of 70 to
120Hz. The oil-lubricated GM-D, GM-LJ and GM-PJ
are four-pole motors and may be used between 25Hz
and high speed of 60 to 120Hz.
When the motor is inverter-driven, there is no
restriction on the permissible number of start times as
starting impact is lessened.
* Independent of the magnitude of load inertia,
provided that the inverter capacity is equal to the
motor capacity at the standard setting of the torque
boost.
Available frequency range
Motor
Insulation
Series capacity
class
4P (kW)
0.1
0.2
E
0.4
GM-S
0.75
1.5
B
2.2
Motor
Insulation
Series capacity
class
4P (kW)
0.4
E
0.75
1.5
GM-D 2.2
3.7 B
5.5
7.5
Motor
Insulation
Series capacity
class
4P (kW)
3.7
5.5
7.5
11
GM-LJ F
15
22
30
37
Frequency Range (Hz)
Grease Oil
lubrication lubrication
3 to 120 —
*1
Frequency Range (Hz)
Grease Oil
lubrication lubrication
3 to 120
*1
25 to 120
—
25 to 115
Frequency Range (Hz)
Grease Oil
lubrication lubrication
3 to 85
*1
25 to 120
3 to 75 *1
3 to 70 25 to 115
*1
25 to 105
25 to 95
- 25 to 90
25 to 70
503
<For special application> Steel line etc.
Motor
Insulation
Series capacity
class
4P (kW)
3.7
5.5
7.5
11
15
GM-PJ F
22
30
37
45
55
*1 If performing continuous
frequency 60Hz or more, replace an oil sheet by one
year.
*2 For details, refer to a catalog of Mitsubishi standard
geared motors.
(2) Built-in brake type geared motor
Refer to page 497 (Motor with Brake). When the
brake is used, this type of motor should be used at
less than 60Hz because there is restriction on the
braking capacity. When a motor with TB brake is
continuously operated at low speed, it will generate
noise which gives no problem regarding function.
(3) Cyclo speed reducer directly coupled with
motor
When the speed reducer is specified as inverter-
driven in the purchase order, the motor may be
different from the standard one.
If overcurrent trip (OC1) occurs immediately after a
start, adjust the torque boost ([Pr. 0]).
1) An 1:10 speed range is standard. Consult the
manufacturer when the speed reducer is used at
more than 60Hz.
2) Lubricant: Frame numbers #208 to #211 are
grease-lubricated.
Frame numbers #84 to #89 of horizontal
mounting type are oil-lubricated like the
standard ones. For this type, oil used
should be of low viscosity within the VG
range.
For frame numbers #84 to #89 of
vertical type, the lubrication system
must be considered according to the
working speed range.
3) Note the starting
temperature.
The loss of the cyclo speed reducer depends on
the ambient temperature, input speed, load factor
and lubricant. The starting characteristic must be
noted under hostile conditions where sudden
acceleration is made from the start to 1800 r/min
under load at a low temperature. The loss in
torque of the oil-lubricated model at the ambient
temperature of 0
value at 60Hz.
SELECTION
Frequency Range (Hz)
Grease Oil
lubrication lubrication
3 to 110
3 to 105
3 to 95
3 to 85
—
3 to 75
3 to 60
operation with inverter
characteristic at low
is 15 to 30% of the rated
3