Danfoss vlt FC 102 Programming Guide

1-90 Motor Thermal Protection
Option: Function:
[20] ATEX ETR
[21] Advanced ETR
ETR functions 1-4 calculate the load when the set-up
where they were selected is active. For example, ETR-3
starts calculating when set-up 3 is selected. For the North
American market: The ETR functions provide class 20
motor overload protection in accordance with NEC.
1.21.0 1.4
30
10
20
100
60
40
50
1.81.6 2.0
2000
500
200
400
300
1000
600
t [s]
175ZA052.12
f
OUT
= 2 x f
M,N
f
OUT
= 0.2 x f
M,N
f
OUT
= 1 x f
M,N
(par. 1-23)
I
MN
(par. 1-24)
I
M
Illustration 3.10 Thermal Motor Protection
NOTICE
If the temperature of the motor is monitored through a
thermistor or a KTY Sensor, the PELV is not complied
with in case of short circuits between motor windings
and the sensor. To comply with PELV, isolate the sensor
appropriately.
NOTICE
Danfoss recommends using 24 V DC as thermistor supply
voltage.
NOTICE
The ETR timer function does not work when
parameter 1-10 Motor Construction=[1] PM, non-salient
SPM.
NOTICE
For correct operation of the ETR function, the setting in
parameter 1-03 Torque Characteristics must t the
application (see description of parameter 1-03 Torque
Characteristics).
3.3.13.1 PTC Thermistor Connection
1330
550
250
-20 °C
175HA183.11
4000
3000
R
(Ω)
 nominal
 nominal -5 °C  nominal +5 °C
 [°C]
Illustration 3.11 PTC Prole
Example using a digital input and 10 V as supply
The frequency converter trips when the motor temperature
is too high.
Parameter set-up:
•
Set parameter 1-90 Motor Thermal Protection to [2]
Thermistor Trip.
•
Set parameter 1-93 Thermistor Source to [6] Digital
Input.
PTC / Thermistor
R
OFF
ON
<800 Ω
+10V
130BA152.10
>2.7 kΩ
12 13 18 37322719 29 33 20
5550
39 42 53 54
Illustration 3.12 PTC Thermistor Connection - Digital Input
Example using an analog input and 10 V as supply
The frequency converter trips when the motor temperature
is too high.
Parameter set-up:
•
Set parameter 1-90 Motor Thermal Protection to [2]
Thermistor Trip.
•
Set parameter 1-93 Thermistor Source to [2] Analog
Input 54.
Parameter Descriptions Programming Guide
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Danfoss vlt FC 102 Specifications

General

Category	DC Drives
Model	Danfoss VLT FC 102
Output voltage range	0 to rated motor voltage
Power range	0.37 kW to 200 kW
Communication interfaces	RS-485
Protection features	Overvoltage, undervoltage, overcurrent, short circuit, earth fault, overtemperature, motor thermal protection
Cooling method	Air-cooled
Enclosure rating	IP20, IP21, IP55 (depending on model)
Approvals	CE, UL, cUL