Danfoss FC 100 Series Operating Instructions Manual page 72

How to Programme the Frequ...
1-86 Trip Speed Low [RPM]
Range:
Application
dependent
*
0 RPM
*
NOTE
This parameter is only available if par. 0-02 Motor Speed
Unit is set to [RPM].
7 7
1-87 Trip Speed Low [Hz]
Range:
Application
dependent
*
0.0 Hz
*
NOTE
This parameter is only available if par. 0-02 Motor Speed
Unit is set to [Hz].
1-90 Motor Thermal Protection
Option:
[0] No protec-
*
tion
72
Function:
[Application Set the desired motor speed for trip
dependant] limit. 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.
[Application
dependant]
Function:
[Application If the Trip Speed is set to 0, the
dependant] 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.
[Application
dependant]
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 and the rated motor
M,N
frequency f . The calculations
M,N
estimate the need for a lower load at
lower speed due to less cooling from
the fan incorporated in the motor.
If the motor is continuously overloaded and no
warning or trip of frequency converter is
wanted.
MG.11.AD.02 - VLT
®
VLT HVAC Drive Operating Instructions
1-90 Motor Thermal Protection
Option:
[1] Thermistor
warning
[2] Thermistor
trip
[3] ETR warning
1
[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.
®
is a registered Danfoss trademark
Function:
Activates a warning when the connected
thermistor in the motor reacts in the event of
motor over-temperature.
Stops (trips) the frequency converter when the
connected thermistor in the motor reacts in
the event of motor over-temperature.