Danfoss VLT AQUA Drive FC 200 Programming Manual page 53

Parameter Description
1-82 Min Speed for Function at Stop [Hz]
Range:
Size related [ 0 - 20.0 Hz]
*
1-86 Trip Speed Low [RPM]
Range: Function:
Size [ 0 - par. Set the desired motor speed for trip
related 4-13 RPM] limit. If the trip speed is set to 0, the
*
function is not active. If the speed at
any time after the start (or during a
stop) falls below the value in the
parameter, the adjustable frequency
drive will trip with an alarm [A49] Speed
Limit. Function at stop.
NOTICE!
This parameter is only available if 0-02 Motor Speed Unit is
set to [RPM].
1-87 Trip Speed Low [Hz]
Range: Function:
Size [ 0 - par. If the trip speed is set to 0, the function
related 4-14 Hz] is not active.
*
If the speed at any time after the start
(or during a stop) falls below the value
in the parameter, the adjustable
frequency drive will trip with an alarm
[A49] Speed Limit. Function at stop.
NOTICE!
This parameter is only available if 0-02 Motor Speed Unit is
set to [Hz].
3.3.10 1-9* Motor Temperature
1-90 Motor Thermal Protection
Option: Function:
The adjustable frequency drive determines the
motor temperature for motor protection in two
different ways:
•
Via a thermistor sensor connected to
one of the analog or digital inputs
(1-93 Thermistor Source).
•
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
the rated motor frequency f
calculations estimate the need for a
lower load at lower speed due to less
®
VLT AQUA Drive Programming Guide
1-90 Motor Thermal Protection
Function: Option:
[0] No
ETR (Electronic Thermal Relay) functions 1-4 will calculate
the load when the set-up where they were selected is
active. For example, ETR-3 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.
2000
1000
600
500
400
300
200
100
Figure 3.11
In order to maintain PELV, all connections made to the
control terminals must be PELV, e.g., thermistor must be
reinforced/double-insulated.
NOTICE!
Danfoss recommends using 24 V DC as thermistor supply
voltage.
NOTICE!
The ETR timer function does not work when 1-10 Motor
Construction = [1] PM, non-salient SPM.
NOTICE!
and
M,N
For correct operation of ETR function, setting in
. The
M,N
1-03 Torque Characteristics must fit the application (see
description of 1-03 Torque Characteristics).
®
MG20O622 - VLT is a registered Danfoss trademark
Function:
cooling from the fan incorporated in
the motor.
If the motor is continuously overloaded and no
protection warning or trip of adjustable frequency drive is
wanted.
t [s]
60
50
40
30
20
10
1.0 1.2 1.4 1.6 1.8
WARNING
fOUT = 1 x f M,N
fOUT = 2 x f M,N
fOUT = 0.2 x f M,N
IM
2.0 IMN
3-27
3 3