Danfoss VLT AutomationDrive FC 361 Programming Manual page 48

Parameter Descriptions
1-80 Function at Stop
Option:
4 4
[4] DC Voltage U0 When the motor is stopped, the
1-81 Min Speed for Function at Stop [RPM]
Range:
Size
related RPM]
*
1-82 Min Speed for Function at Stop [Hz]
Range:
Size
related Hz]
*
4.2.9 1-9* Motor Temperature
1-90 Motor Thermal Protection
Option:
46
Function:
Sample rotor time constants =
(Xh+X2)/(6.3*Freq_nom*Rr)
1 kW = 0.2 s
10 kW = 0.5 s
100 kW = 1.7 s
1000 kW = 2.5 s
parameter 1-55 U/f Characteristic - U
[0] defines the voltage at 0 Hz.
Function:
[0 - 600 Set the speed at which to activate
parameter 1-80 Function at Stop.
Function:
[ 0 - 500.0 Set the output frequency at which
to activate parameter 1-80 Function
at Stop.
Function:
Motor thermal protection can be
implemented using a range of
techniques:
•
Via a PTC sensor in the
motor windings connected
to 1 of the analog or
digital inputs
(parameter 1-93 Thermistor
Source). See
chapter 4.2.10 PTC
Thermistor Connection.
•
Via calculation (ETR =
Electronic Thermal Relay)
of the thermal load, based
on the actual load and
time. The calculated
thermal load is compared
Danfoss A/S © 03/2019 All rights reserved.
VLT® AutomationDrive FC 361
1-90 Motor Thermal Protection
Option:
current
magnitude
(parameter 2-00 D
C Hold Current or
parameter 2-01 D
C Brake Current)
to be equal to
I_pre-mag =
Unom/(1.73 x Xh)
[0]
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]
[9]
[10]
Function:
with the rated motor
current I
motor frequency f
chapter 4.2.11 ETR.
•
Via a mechanical thermal
switch (Klixon type). See
chapter 4.2.12 Klixon.
For the North American market: The
ETR functions provide class 20
motor overload protection in
accordance with NEC.
No protection Continuously overloaded motor
when no warning or trip of the
frequency converter is required.
Thermistor Activates a warning when the
warning connected thermistor or KTY sensor
in the motor reacts in the event of
motor overtemperature.
Thermistor trip Stops (trips) the frequency
converter when connected
thermistor or KTY sensor in the
motor reacts in the event of motor
overtemperature.
The thermistor cutout value must
be more than 3 kΩ.
Integrate a thermistor (PTC sensor)
in the motor for winding
protection.
ETR warning 1 Calculates the load when set-up 1
is active and activates a warning on
the display when the motor is
overloaded. Program a warning
signal via 1 of the digital outputs.
ETR trip 1 Calculates the load when set-up 1
is active and stops (trips) the
frequency converter when the
motor is overloaded. Program a
warning signal via 1 of the digital
outputs. The signal appears in the
event of a warning and if the
frequency converter trips (thermal
warning).
ETR warning 2
ETR trip 2
ETR warning 3
ETR trip 3
ETR warning 4
ETR trip 4
and the rated
M,N
. See
M,N
MG06J202