1.
•
•
•
•
•
Parameter
Setting
Parameter 1-99 ATEX ETR interpol points current
Motor nameplate
Parameter 1-23 Motor Frequency
Motor nameplate
Parameter 4-19 Max Output Frequency
Motor nameplate, possible reduced for long motor cables, sine-wave filter, or
reduced supply voltage.
Parameter 4-18 Current Limit
Forced to 150% by
parameter 1-90 Motor Thermal Protection [20] ATEX ETR
.
Parameter 5-15 Terminal 33 Digital Input
[80] PTC Card 1
Parameter 5-19 Terminal 37 Safe Stop
[4] PTC 1 Alarm
Parameter 14-01 Switching Frequency
Check that the default value fulfills the requirement from the motor name-
plate. If not, use a sine-wave filter.
Parameter 14-26 Trip Delay at Inverter Fault
0
4.4.2 Activate the ATEX ETR Monitor Function
Procedure
Set
parameter 1-90 Motor Thermal Protection
to
[20] ATEX ETR
.
This activation of the ATEX ETR monitor function enables
parameter 1-94 ATEX ETR cur.lim. speed reduction
,
parame-
ter 1-98 ATEX ETR interpol. points freq.
, and
parameter 1-99 ATEX ETR interpol points current
. Furthermore, it limits
parameter 4-18 Current Limit
to 150%.
4.4.3 Maximum Current Limit
Operation above the thermal characteristic curve is allowed for a limited period of 60 s.
The actual thermal overload is based on the ETR function selected in
parameter 1-90 Motor Thermal Protection
and is shown in
pa-
rameter 16-18 Motor Thermal
.
Running above the characteristic curve for more than 50 s issues
warning 163, ATEX ETR cur.lim.warning
. Configure the reaction for
operating in Ex eb and Ex ec current limits in
parameter 1-94 ATEX ETR cur.lim. speed reduction
.
0%: The drive does not change anything besides issuing
warning 163, ATEX ETR cur.lim.warning
.
>0%: The drive issues
warning 163, ATEX ETR cur.lim.warning
and reduces motor speed following ramp 2 (
paramter group 3-5*
Ramp 2
).
Example
Actual reference = 200 RPM
Parameter 1-94 ATEX ETR cur.lim. speed reduction
= 20%
Resulting reference = 160 RPM
Operating above the characteristic curve for more than 60 s within a period of 600 s issues
alarm 164, ATEX ETR cur.lim.
, and the drive
trips.
Operation above 150% nominal motor current trips the drive after 1 s with
alarm 164, ATEX ETR cur.lim
.
Operation above 180% nominal motor current immediately trips the drive with
alarm 164, ATEX ETR cur.lim
.
After the 1
st
power-up, the overload counter starts at a value that prevents resetting the thermal load value by power cycling. After
start-up, the overload warning is suppressed until the motor current exceeds the rated current for the first time.
4.4.4 Minimum Motor Frequency
The operation below the minimum frequency in
parameter 1-98 ATEX ETR interpol. points freq.
is allowed for a limited time only.
Running below the minimum frequency for more than 50 s issues
warning 165, ATEX ETR freq.lim.warning
.
Operation below the minimum frequency for more than 60 s within a period of 600 s issues
alarm 166, ATEX ETR freq.lim.alarm
. The
drive trips.
AQ267038105120en-000101 / 130R0104 | 21
Danfoss A/S © 2022.08
Commissioning
VLT® PTC Thermistor Card MCB 112
Operating Guide