•
For high inertia applications (i.e., where the load
inertia is more than 30 times larger than the
motor inertia).
1-80 Function at Stop
Option:
Function:
Select the drive function after a stop command
or after the speed is ramped down to the
settings in
1-82 Min Speed for Function at Stop
[Hz]
. Function at Stop.
Available selections depend on
1-10 Motor
Construction
:
[0] Asynchron:
[0] coast
[1] DC hold
[1] PM non-salient:
[0] coast
[0] Coast
Leaves motor in free mode.
[1] DC hold /
Motor
Preheat
Energizes motor with a DC holding current (see
2-00 DC Hold/Motor Preheat Current
1-82 Min Speed for Function at Stop [Hz]
Range:
Function:
0 Hz
*
[0 - 20 Hz] Set the output frequency at which to
activate
.
1-90 Motor Thermal Protection
Option:
Function:
Using ETR (Electronic Thermal Relay) the
motor temperature is calculated based on
frequency, speed and time. Danfoss
recommends using the ETR function, if a
thermistor is not present.
NOTE!
ETR calculation is based on motor data
from group 1-2*.
[0] No protection Disables temperature monitoring.
[1] Thermistor
warning
A thermistor connected to either digital or
analog input gives a warning if upper limit of
motor temperature range is exceeded, (see
).
[2] Thermistor
trip
A thermistor connected to either digital or
analog input gives an alarm and makes the
adjustable frequency drive trip if upper limit
of motor temperature range is exceeded, (see
).
1-90 Motor Thermal Protection
Option:
Function:
[3] ETR warning
1
If the calculated upper limit of the motor
temperature range is exceeded, a warning is
issued.
[4] ETR trip 1
If 90% of the calculated upper limit of the
motor temperature range is exceeded, an
alarm is issued and the adjustable frequency
drive trips.
1-93 Thermistor Source
Option:
Function:
Select the input to which the thermistor
(PTC sensor) should be connected. When
using an analog input, the same analog can
not be used as a reference in
3-15 Reference
Resource 1
to
3-17 Reference Resource 3
.
[0] None
[1] Analog input
AI53
[6] Digital input
DI29
NOTE!
This parameter cannot be adjusted while the motor is
running.
NOTE!
Digital input should be set to [0]
PNP - Active at 24 V
in
Parameters
VLT
®
HVAC Basic Drive Programming Guide
3-12
MG18B222 - VLT
®
is a registered Danfoss trademark
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