Operating instructions

NOTE
This parameter is only available if par. 0-02 Motor Speed
Unit is set to [RPM].
1-87 Trip Speed Low [Hz]
Range: Function:
Application
dependent
*
[Application
dependant]
If the Trip Speed is set to 0, the
function is not active.
If the speed at any time after the
start (or during a stop) falls below
the value in the parameter, the
drive will trip with an alarm [A49]
Speed Limit. Function at stop.
0.0 Hz
* [Application
dependant]
NOTE
This parameter is only available if par. 0-02 Motor Speed
Unit is set to [Hz].
3.3.9 1-9* Motor Temperature
Parameters for setting the temperature protection features for
the motor.
1-90 Motor Thermal Protection
Option: Function:
The frequency converter determines the motor
temperature for motor protection in two differ-
ent ways:
•
Via a thermistor sensor connected to
one of the analog or digital inputs
(par. 1-93 Thermistor Source).
•
Via calculation (ETR = Electronic
Thermal Relay) of the thermal load,
based on the actual load and time.
The calculated thermal load is
compared with the rated motor
current I
M,N
and the rated motor
frequency f
M,N
. The calculations
estimate the need for a lower load at
lower speed due to less cooling from
the fan incorporated in the motor.
[0]
* No protec-
tion
If the motor is continuously overloaded and no
warning or trip of frequency converter is
wanted.
[1] Thermistor
warning
Activates a warning when the connected
thermistor in the motor reacts in the event of
motor over-temperature.
[2] Thermistor
trip
Stops (trips) the frequency converter when the
connected thermistor in the motor reacts in
the event of motor over-temperature.
[3] ETR warning
1
1-90 Motor Thermal Protection
Option: Function:
[4] * ETR trip 1
[5] ETR warning
2
[6] ETR trip 2
[7] ETR warning
3
[8] ETR trip 3
[9] ETR warning
4
[10] ETR trip 4
ETR (Electronic Thermal Relay) functions 1-4 will calculate the
load when 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.
Parameter Description
VLT
®
HVAC Drive Programming Guide
44 MG.11.CA.02 - VLT
®
is a registered Danfoss trademark
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