Danfoss VLT AutomationDrive FC 302 Programming Manual page 54

Parameter Descriptions
1-84 Precise Stop Counter Value
Range:
3 3
1-85 Precise Stop Speed Compensation Delay
Range:
10 ms [0 -
*
100 ms]
3.3.10 1-9* Motor Temperature
1-90 Motor Thermal Protection
Option:
52
VLT
Function:
NOTICE
Not used for selections [0] Precise
ramp stop and [3] Speed comp stop
in parameter 1-83 Precise Stop
Function
Function:
Enter the delay time for sensors, PLCs, etc. for
use in parameter 1-83 Precise Stop Function. In
speed compensated stop mode, the delay time
at different frequencies has a major influence
on the stop function.
NOTICE
Not used for selections [0] Precise ramp
stop, [1] Cnt stop with reset and [2] Cnt
stop w/o reset in parameter 1-83 Precise
Stop Function
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
(parameter 1-93 Thermistor Source).
See chapter 3.3.11.1 PTC Thermistor
Connection.
•
Via a KTY sensor in the motor
winding connected to an analog
input (parameter 1-96 KTY Thermistor
Resource). See chapter 3.3.11.2 KTY
Sensor Connection.
•
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
M,N
chapter 3.3.11.3 ETR and
chapter 3.3.11.4 ATEX ETR.
•
Via a mechanical thermal switch
(Klixon type). See
chapter 3.3.11.5 Klixon.
®
AutomationDrive FC 301/302 Programming Guide
1-90 Motor Thermal Protection
Option:
[0] No
protection
[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
[20] ATEX ETR
[21] Advanced
ETR
NOTICE
If [20] ATEX ETR is selected, follow the instructions in the
dedicated chapter of the VLT
Guide and the instructions given by the motor
manufacturer.
MG33MI02 - Rev. 2013-11-20
Function:
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 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) the frequency converter when
connected 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.
Calculates the load when set-up 1 is active
and activates a warning on the display when
the motor is overloaded. Programme a
warning signal via one of the digital outputs.
Calculates the load when set-up 1 is active
and stops (trips) 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).
Activates the thermal monitoring function for
Ex-e motors for ATEX. Enables
parameter 1-94 ATEX ETR cur.lim. speed
reduction, parameter 1-98 ATEX ETR interpol.
points freq. and parameter 1-99 ATEX ETR
interpol points current.
®
AutomationDrive Design