Balance; Output Shafts; Fcm 106 Inertia; Fcm 106 Motor Frame Size - Danfoss VLT DriveMotor FCP 106 Design Manual

System Integration

3.3.5 Balance

The FCM 106 is balanced to class R according to ISO 8821
(reduced balance). For critical applications, especially at
high speed (>4000 RPM), special balance (class S) may be
required.

3.3.6 Output Shafts

Output shafts are manufactured from 35/40 Ton (460/540
2
MN/m ) tensile steel. Drive end shafts are provided with a
tapped hole to DIN 332 Form D and a closed profile
keyway as standard.

3.3.7 FCM 106 Inertia

Inertia J Asynchronous motor
FCM 106 1)
[kW] 3000 RPM 1500 RPM
0.55 –
0.75 0.0007 0.0025
1.1 0.00089 0.00373
1.5 0.00156 0.00373
2.2 0.0018 0.00558
3.0 0.00405 0.00703
4.0 0.00648 0.0133
5.5 0.014 0.03
7.5 0.016 0.036
2
Table 3.10 Inertia [kgm ]
1) Power ratings relate to NO, see chapter 6.2 Electrical Data.

3.3.8 FCM 106 Motor Frame Size

Asynchronous motor
1)
Power size
[kW] 1500 RPM 3000 RPM
0.55 – –
0.75 80 71
1.1 90 80
1.5 90 80
2.2 100 90
3 100 90
4 112 100
5.5 112 112
7.5 132 112
Table 3.11 FCM 106 - Motor Frame Size for PM and
Asynchronous Motors
1) Power ratings relate to NO, see chapter 6.2 Electrical Data.
MG03M202
Design Guide
PM motor
3000 RPM 1500 RPM
– – 0.00047
0.00047 0.0007
0.00047 0.00091
0.0007 0.0011
0.00091 0.00082
0.00082 0.00104
0.00107 0.00131
0.00131 0.0136
0.0136 0.0206
PM motor
1500 RPM 3000 RPM
71 –
71 71
71 71
71 71
90 71
90 90
90 90
112 90
112 112
Danfoss A/S © 06/2016 All rights reserved.

3.3.9 Motor Thermal Protection

Motor overload protection can be implemented using a
range of techniques:
•
Electronic thermal relay (ETR).
•
Thermistor sensor placed between motor
windings.
•
Mechanical thermal switch.

3.3.9.1 Electronic Thermal Relay

ETR is functional for asynchronous motors only. The ETR
protection comprises simulation of a bimetal relay based
on internal frequency converter measurements of the
actual current and speed. The characteristic is shown in
Illustration 3.5.
t [s]
2000
1000
600
500
400
300
200
100
60
50
40
30
20
10
1.0 1.2 1.4 1.6 1.8
Illustration 3.5 ETR Protection Characteristic
The X-axis shows the ratio between I
nominal. The Y-axis shows the time in seconds before the
ETR cuts off and trips the frequency converter. The curves
show the characteristic nominal speed at twice the
nominal speed, and at 0.1 x the nominal speed.
It is clear that at lower speed, the ETR cuts off at lower
heat, due to less cooling of the motor. In that way, the
motor is protected from overheating, even at low speed.
Summary
ETR is functional for asynchronous motors only. The ETR
protects the motor against overheating, and no further
motor overload protection is required. When the motor is
heated up, the ETR timer controls the duration of running
at high temperature, before stopping the motor to prevent
overheating.
When the motor is overloaded before reaching the
temperature where the ETR shuts off the motor, the
current limit protects the motor and application against
overload. In this case, ETR does not activate and therefore
a different method of thermal protection is required.
f = 1 x f (par. 1-23)
OUT M,N
f = 2 x f
OUT M,N
f = 0.1 x f
OUT M,N
I
M
2.0 I (par. 1-24)
MN
and I
motor motor
37
3 3