10
Installation and maintenance
LSRPM - PLSRPM
Synchronous permanent magnet motors
LEROY-SOMER
4155 en - 2012.05 / e
2.4 - Electrical protection of the motors
2.4.1 - Recommendations for variable speed
Special precautions must be taken when using synchronous
motors powered via a frequency inverter:
during prolonged operation at low speed, cooling efficiency is
greatly diminished. It is therefore advisable to install a forced
ventilation unit that will produce a constant flow of air
independently of the motor speed.
In prolonged operation at high speed, the fan may make
excessive noise. It is again advisable to install a forced
ventilation unit.
2.4.2 - Thermal protection
The motors are protected by the variable speed drive, placed
between the isolating switch and the motor.
Adjusting the thermal protection
It must be set to the value of the current shown on the motor
nameplate for the voltage and frequency.
The drive provides total protection of the motor against
mechanical overloads.
Built-in indirect thermal protection
The motors are fitted with PTC sensors as standard. As an
option specific sensors can be fitted on the motor to monitor
temperature changes at «hot spots»:
- overload detection,
- cooling check,
- monitoring strategic points for maintenance of the installation.
It must be emphasized that these sensors cannot be used
to carry out direct adjustment of the operating cycle.
Caution: Make sure you comply with the supply
voltages specified on the motor rating plate
(± 10%). Outside this range, there is a risk of tem-
perature rise.
Optional: Standard slide rails (conforming to standard NFC 51-105)
These steel slide rails are supplied with tension screws and 4 nuts and bolts for fixing the motor onto the slide rails, but the fixing bolts
for the slide rails are not supplied.
Motor
Type
Dimensions
Weight per pair
frame size
of slide rail
A
E
H
K
L
X
Y
Z
Ø J
of slide rails (kg)
90
G 90/8 PM
355
395
40
2.5
50
324
264
294
13
3
100 and 132
G 132/10 PM
420
530
49.5
7
60
442
368
405
15
6
160
G 180/12 PM
630
686
60.5
7
75
575
475
525
19
11
200 and 225
G 225/16 PF
800
864
75
28.5
90
-
623
698
24
16
250 and 280
G 280/20 PF
1000
1072
100
35
112
-
764
864
30
36
315
G 355/24 PF
1250
1330
125
36
130
-
946
1064
30
60
H
L
Y
Z
X
A
E
K
ØJ
