Danfoss VLT AutomationDrive FC 302 Instruction Manual page 58

Programming
1-04 Overload Mode
Option:
[0] High torque Allows up to 160% over torque.
[1] Normal
torque
6 6
1-90 Motor Thermal Protection
Option:
[0] No
protection
[1] Thermistor
warning
[2] Thermistor
trip
56
Instruction Manual
Function:
NOTICE!
This parameter cannot be adjusted while
the motor is running.
For oversized motor - allows up to 110% over
torque.
For oversized motor - allows up to 110% over
torque.
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 and the rated motor
M,N
frequency f . See chapter 6.1.3.1 .
M,N
•
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.
Continuously overloaded motor, when no
warning or trip of the adjustable frequency
drive is required.
Activates a warning when the connected
thermistor or KTY sensor in the motor reacts
in the event of motor overtemperature.
Stops (trips) adjustable frequency drive when
connected thermistor or KTY sensor in the
motor reacts in the event of motor overtem-
perature.
Danfoss A/S © Rev. 2014-02-07 All rights reserved.
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 Calculates the load when Set-up 1 is active
1 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%.
®
MG37A222