1-04 Overload Mode
Option: Function:
NOTICE!
This parameter cannot be adjusted while
the motor is running.
For oversized motor - allows up to 110% over
torque.
[0] High torque Allows up to 160% over torque.
[1] Normal
torque
For oversized motor - allows up to 110% over
torque.
1-90 Motor Thermal Protection
Option: Function:
Thermal motor protection can be
implemented using a range of techniques:
•
Via a PTC sensor in the motor
windings connected to one of the
analog or digital inputs (1–93
Thermistor Source). See
chapter 6.1.3.1 PTC Thermistor
Connection.
•
Via a KTY sensor in the motor
winding connected to an analog
input (1-96 KTY Thermistor Resource).
See .
•
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
. See chapter 6.1.3.1 .
•
Via a mechanical thermal switch
(Klixon type). See
chapter 6.1.3.1 ATEX ETR.
For the North American market: The ETR
functions provide class 20 motor overload
protection in accordance with NEC.
[0]
No
protection
Continuously overloaded motor, when no
warning or trip of the adjustable frequency
drive is required.
[1] Thermistor
warning
Activates a warning when the connected
thermistor or KTY sensor in the motor reacts
in the event of motor overtemperature.
[2] Thermistor
trip
Stops (trips) adjustable frequency drive when
connected thermistor or KTY sensor in the
motor reacts in the event of motor overtem-
perature.
1-90 Motor Thermal Protection
Option: Function:
The thermistor cut-out value must be > 3 kΩ.
Integrate a thermistor (PTC sensor) in the
motor for winding protection.
[3] 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 one of the digital outputs.
[4] ETR trip 1 Calculates the load when Set-up 1 is active
and stops (trips) the adjustable frequency
drive when the motor is overloaded. Program
a warning signal via one of the digital
outputs. The signal appears in the event of a
warning, or if the adjustable frequency drive
trips (thermal warning).
[5] ETR warning
2
[6] ETR trip 2
[7] ETR warning
3
[8] ETR trip 3
[9] ETR warning
4
[10] ETR trip 4
[20] ATEX ETR Activates the thermal monitoring function for
Ex-e motors for ATEX. Enables 1-94 ATEX ETR
cur.lim. speed reduction, 1-98 ATEX ETR interpol.
points freq., and 1-99 ATEX ETR interpol points
current.
[21] Advanced
ETR
NOTICE!
If [20] ATEX ETR is selected, follow the instructions
described in the dedicated chapter of the VLT
®
AutomationDriveFC 301/FC 302 Design Guide and the
instructions given by the motor manufacturer.
NOTICE!
If [20] ATEX ETR is selected, set 4-18 Current Limit to
150%.
Programming Instruction Manual
56 Danfoss A/S © Rev. 2014-02-07 All rights reserved. MG37A222
66
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