Danfoss FC 300 Programming Manual page 44

Parameter Descriptions
1-85 Precise Stop Speed Compensation Delay
Range:
10 ms [0 - 100
*
ms]
3 3
3.3.9 1-9* Motor Temperature
1-90 Motor Thermal Protection
Option:
[0] No protec-
*
tion
[1] Thermistor
warning
[2] Thermistor
trip
[3] ETR
warning 1
[4] ETR trip 1
[5] ETR
warning 2
[6] ETR trip 2
44
FC 300 Programming Guide
Function:
Enter the delay time for sensors, PLCs, etc. for
use in par. 1-83 Precise Stop Function. In
speed compensated stop mode, the delay
time at different frequencies has a major
influence on the stop function.
Function:
The frequency converter determines the motor
temperature for motor protection in three
different ways:
•
Via a thermistor sensor connected to
one of the analog or digital inputs
(par. 1-93 Thermistor Source). See
section PTC Thermistor Connection.
•
Via a KTY sensor connected to an
analog input (par. 1-96 KTY Thermistor
Resource). See section KTY Sensor
Connection.
•
Via calculation (ETR = Electronic
Terminal 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.
Continuously overloaded motor, when no
warning or trip of the frequency converter is
required.
Activates a warning when the connected
thermistor or KTY-sensor in the motor reacts in
the event of motor over-temperature.
Stops (trips) frequency converter when connec-
ted thermistor or KTY sensor in the motor reacts
in the event of motor over-temperature.
The thermistor cut-out value must be > 3 kΩ.
Integrate a thermistor (PTC sensor) in the motor
for winding protection.
Please see detailed description below
MG.33.M9.02 - VLT
1-90 Motor Thermal Protection
Option: Function:
[7] ETR
warning 3
[8] ETR trip 3
[9] ETR
warning 4
[10] ETR trip 4
Select ETR Warning 1-4, to activate a warning on the display
when the motor is overloaded.
Select ETR Trip 1-4 to trip the frequency converter when the
motor is overloaded.
Programme a warning signal via one of the digital outputs.
The signal appears in the event of a warning and if the
frequency converter trips (thermal warning).
ETR (Electronic Terminal Relay) functions 1-4 will calculate the
load when the set-up where they were selected is active. For
example ETR 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.
1-91 Motor External Fan
Option: Function:
[0] No No external fan is required, i.e. the motor is derated at
*
low speed.
[1] Yes Applies an external motor fan (external ventilation), so
no derating of the motor is required at low speed. The
graph below is followed if the motor current is lower
than nominal motor current (see par. 1-24 Motor
Current). If the motor current exceeds nominal current,
the operation time still decreases as if no fan were
installed.
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is a registered Danfoss trademark