Electrical Protection Of The Motors - Leroy-Somer LSRPM Series Installation And Maintenance Manual

LEROY-SOMER
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.
L
Motor Type
frame size of slide rail
90 G 90/8 PM
100 and 132 G 132/10 PM
160 G 180/12 PM
200 and 225 G 225/16 PF
250 and 280 G 280/20 PF
315 G 355/24 PF

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.
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.
10
Installation and maintenance
LSRPM - PLSRPM
Synchronous permanent magnet motors
H
A E H
355 395 40
420 530 49.5
630 686 60.5
800 864 75
1000 1072 100
1250 1330 125
ØJ
Dimensions
K L X Y
2.5 50 324 264
7 60 442 368
7 75 575 475
28.5 90 - 623
35 112 - 764
36 130 - 946
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.
4155 en - 2012.05 / e
X
Z
Y
A
E
Weight per pair
Z Ø J of slide rails (kg)
294 13 3
405 15 6
525 19 11
698 24 16
864 30 36
1064 30 60
K