Danfoss VLT AutomationDrive FC 301 Programming Manual page 53

Parameter Descriptions
Function Setting
1-90 Motor Thermal [20] ATEX ETR
Protection
1-94 ATEX ETR cur.lim. speed 20%
reduction
1-98 ATEX ETR interpol.
points freq.
Motor name plate
1-99 ATEX ETR interpol
points current
1-23 Motor Frequency Enter the same value as for
4-19 Max Output Frequency
4-19 Max Output Frequency Motor name plate, possibly
reduced for long motor cables,
sinus filter or reduced supply
voltage
4-18 Current Limit Forced to 150% by 1-90 [20]
5-15 Terminal 33 Digital [80] PTC Card 1
Input
5-19 Terminal 37 Safe Stop [4] PTC 1 Alarm
14-01 Switching Frequency Check that the default value fulfils
the requirement from Motor
name plate. If not, use sine wave
filter.
14-26 Trip Delay at Inverter 0
Fault
Table 3.8 Parameters
CAUTION
Compare the minimum switching frequency requirement
stated by the motor manufacturer to the minimum
switching frequency of the frequency converter, the
default value in 14-01 Switching Frequency. If the
frequency converter does not meet this requirement, use
a sine wave filter.
More information about ATEX ETR Thermal Monitoring can
be found in the Application Note MN33G.
3.3.11.5 Klixon
The Klixon type thermal circuit breaker uses a KLIXON
metal dish. At a predetermined overload, the heat caused
by the current through the disc causes a trip.
Using a digital input and 24 V as power supply:
Example: The frequency converter trips when the motor
temperature is too high
Parameter set-up:
Set 1-90 Motor Thermal Protection to [2] Thermistor Trip
Set 1-93 Thermistor Source to [6] Digital Input
®
VLT AutomationDrive FC 301/302 Programming Guide
12 13 18
PTC / Thermistor
Illustration 3.17 Thermistor Connection
1-91 Motor External Fan
Option: Function:
[0] No
[1] Yes Applies an external motor fan (external ventilation), so
1-93 Thermistor Source
Option:
[0] None
[1] Analog Input
®
53
[2] Analog Input
54
[3] Digital input
18
[4] Digital input
19
[5] Digital input
32
[6] Digital input
33
MG33MH02 - Rev. 2013-09-30
OFF
19 27 29 32 33 20 37
ON
<6.6 k Ω >10.8 k Ω
No external fan is required, i.e. the motor is derated at
low speed.
no derating of the motor is required at low speed. The
upper curve in graph above (fout = 1 x fM,N) is
followed if the motor current is lower than nominal
motor current (see 1-24 Motor Current). If the motor
current exceeds nominal current, the operation time
still decreases as if no fan were installed.
Function:
NOTICE
This parameter cannot be adjusted
while the motor is running.
Select the input to which the thermistor
(PTC sensor) should be connected. An
analog input option [1] Analog Input 53 or [2]
Analog Input 54 cannot be selected if the
analog input is already in use as a reference
source (selected in 3-15 Reference 1 Source,
3-16 Reference 2 Source or 3-17 Reference 3
Source).
When using MCB 112, choice [0] None must
always be selected.
3 3
R
51