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

System Integration

3.3.5 Balance

The FCM 106 is balanced to class R according to ISO8821
(reduced balance). For critical applications especially at
high speed (>4000 RPM) special balance (class S) may be
3 3 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 DIN332 Form D and a closed profile
keyway as standard.

3.3.7 FCM 106 Inertia

Inertia J
3000 RPM
FCM 106 1)
0.55
0.75
1.1
1.5
2.2
3.0
4.0
5.5
7.5
Table 3.8 Inertia [kgm
1) Power ratings relate to NO, see chapter 6.2 Electrical Data.

3.3.8 FCM 106 - Motor Frame Size

Frequency
converter
power size 1)
[kW]
0.55
0.75
1.1
1.5
2.2
3
4
5.5
7.5
Table 3.9 FCM 106 - Motor Frame Size for PM and
Asynchronous Motors
1) Power ratings relate to NO, see chapter 6.2 Electrical Data.
28
Asynchronous motor PM motor
1500 RPM 3000 RPM
N.A. N.A. N.A.
0.0007 0.0025 0.00047
0.00089 0.00373 0.00047
0.00156 0.00373 0.0007
0.0018 0.00558 0.00091
0.00405 0.00703 0.00082
0.00648 0.0133 0.00107
0.014 0.03 0.00131
0.016 0.036 0.0136
2
]
Asynchronous motor PM motor
1500 RPM 3000 RPM 1500 RPM 3000 RPM
N.A. N.A. 71
80 71 71
90 80 71
90 80 71
100 90 90
100 90 90
112 100 90
112 112 112
132 112 112
®
VLT DriveMotor FCP 106 and FCM 106 Design Guide

3.3.9 Motor Thermal Protection

Motor protection can be implemented using a range of
techniques: Electronic Thermal Relay (ETR); thermistor
sensor placed between motor windings or a mechanical
thermal switch (Klixon type).

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
1500 RPM
600
500
0.00047
400
0.0007
300
200
0.00091
0.0011
100
60
0.00082
50
0.00104
40
0.00131
30
0.0136 20
10
0.0206
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 0.1x 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 over-heating, even at low speed.
N.A.
Summary
71
ETR is functional for asynchronous motors only. The ETR
71
protects the motor against over-heating, and no further
71
motor protection is required. When the motor is heated
71
up, the ETR timer controls the duration of running at high
90
temperature, before stopping the motor to prevent over-
90
heating.
90
When the motor is overloaded before reaching the
112
temperature where the ETR shuts off the motor, the
current limit protects the motor and application against
overload. In this case, ETR will not activate and therefore a
different method of thermal protection is required.
Activate ETR in 1-90 Motor Thermal Protection. ETR is
controlled in 4-18 Current Limit Mode.
MG03M102 - 08/2015
1.0 1.2 1.4 1.6 1.8 2.0
motor
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
I (par. 1-24)
MN
and I
motor