3.3.10 1-8* Stop Adjustments
1-80 Function at Stop
Option:
Function:
Select the frequency converter function after a
stop command or after the speed is ramped
down to the settings in
Speed for Function at Stop [RPM]
Available selections depend on
parameter 1-10 Motor Construction
[0] Asynchronous:
[0] Coast
[1] DC hold
[2] Motor check, warning
[6] Motor check, alarm
[1] PM non-salient:
[0] Coast
[0]
*
Coast
Leaves motor in free mode.
[1]
DC Hold/
Motor
Preheat
Energises motor with a DC hold current (see
parameter 2-00 DC Hold/Preheat Current
).
[2]
Motor
check,
warning
The frequency converter issues a warning if 1
or more phases are missing.
[6]
Motor
check,
alarm
The frequency converter issues an alarm if 1 or
more phases are missing.
1-81 Min Speed for Function at Stop [RPM]
Range:
Function:
Size related
*
[0 - 600
RPM]
Set the speed at which to activate
parameter 1-80 Function at Stop
.
1-82 Min Speed for Function at Stop [Hz]
Range:
Function:
Size related
*
[ 0 - 20.0
Hz]
Set the output frequency at which to
activate
3.3.11 Trip at Motor Speed Low Limit
In
parameter 4-11 Motor Speed Low Limit [RPM]
and
parameter 4-12 Motor Speed Low Limit [Hz]
it is possible to
set a minimum speed for the motor to ensure proper oil
distribution.
In some cases, for example if operating in current limit
because of a defect in the compressor, the output motor
speed can be suppressed below motor speed low limit. To
prevent damage to the compressor, it is possible to set a
trip limit. If the motor speed drops below this limit, the
frequency converter trips and issues
alarm (A49)
.
Reset takes place according to the selected function in
.
If the trip must take place at a rather exact speed (RPM),
set
parameter 0-02 Motor Speed Unit
for RPM and use slip
compensation, which can be set in
NOTICE
To achieve the highest accuracy with the slip compen-
sation, an Automatic motor adaptation (AMA) should be
performed. To be enabled in
.
NOTICE
Trip is not active when using a normal stop- or coast
command.
1-86 Trip Speed Low [RPM]
Range:
Function:
Size
related
*
[ 0 -
par.
4-13
RPM]
NOTICE
This parameter is only available if
parameter 0-02 Motor Speed Unit
is set
to [RPM].
Enter the low limit for the motor speed at
which the frequency converter trips. If the
value is 0, the function is not active. If the
speed at any time after the start (or during
a stop) drops below the value in the
parameter, the frequency converter trips
with
alarm
49 Speed Limit
.
1-87 Trip Speed Low [Hz]
Range:
Function:
Size
related
*
[ 0 -
par.
4-14
Hz]
NOTICE
This parameter is only available if
parameter 0-02 Motor Speed Unit
is set
to [Hz].
Enter the low limit for the motor speed at
which the frequency converter trips. If the
value is 0, the function is not active. If the
speed at any time after the start (or during a
stop) drops below the value in the
parameter, the frequency converter trips with
alarm 49 Speed Limit
.
Parameter Descriptions
VLT
®
HVAC Drive FC 102
50
Danfoss A/S © 03/2015 All rights reserved.
MG11CE02
3
3
