35
Thermal protection on the motor
Section 3-6
3-6
Thermal protection on the motor
Standard motors are normally fitted with an internal fan. The cooling capacity
of this built-in fan is dependent on the frequency of the motor. At low fre-
quency, the cooling capacity will be insufficient for nominal loads. Please con-
tact the motor supplier for the cooling characteristics of the motor at lower
frequency.
!Warning
Depending on the cooling characteristics of the motor, the application, the
speed and the load, it may be necessary to use forced cooling on the motor.
Motor thermistors offer better thermal protection for the motor. Depending on
the type of motor thermistor fitted, the optional PTC input may be used. The
motor thermistor gives a thermal protection independent of the speed of the
motor, thus of the speed of the motor fan. See the functions, Motor I
2
t type
[231] and Motor I
2
t current [232].
3-7
Motors in parallel
It is possible to have motors in parallel as long as the total current does not
exceed the nominal value of the VSD. The following has to be taken into
account when setting the motor data:
Table 10 Model SX-D4030-EF
Brake chopper
Mains/motor
Tightening torque, Nm
2.8
2.8
Table 11 Model SX-D4037-EF
Brake chopper
Mains/motor
Tightening torque, Nm
5.0
5.0
Table 12 Model SX-D4045-EF to SX-D4055-EF
Brake chopper
Mains/motor
Block, mm
2
95 95
Cable diameter, mm
2
16-95
16-95
Tightening torque, Nm
14
14
Table 13 Model SX-D4075-EF to SX-D4090-EF
Brake chopper
Mains/motor
Block, mm
2
95
150
Cable diameter, mm
2
16-95 35-95
120-150
Tightening torque, Nm
14
14
24
Table 14 Model SX-D4110-EF to SX-D4132-EF and SX-D6090-EF to SX-D6160-EF
Brake chopper
Mains/motor
Block, mm
2
150 240
Cable diameter, mm
2
35-95 120-150
35-70 95-240
Tightening torque, Nm
14
24
14
24
Menu [221]
Motor Voltage:
The motors in parallel must have the same motor voltage.
Menu [222]
Motor Frequency:
The motors in parallel must have the same motor frequency.
Menu [223]
Motor Power:
Add the motor power values for the motors in parallel.
Summary of Contents for SX-F
Page 2: ......
Page 14: ...6 Table of contents...
Page 20: ...12 Glossary Section 1 6...
Page 32: ...24 Cabinet mounting Section 2 3...
Page 58: ...50 Connecting options Section 5 6...
Page 72: ...64 Load Monitor and Process Protection 400 Section 7 5...
Page 74: ...66 EMC standards Section 8 1...
Page 266: ...258 System Data 900 Section 11 9...
Page 274: ...266 Maintenance Section 12 3...
Page 284: ...276 Liquid cooling Section 13 12...
