Technical information

1-79 Compressor Start Max Time to Trip
Range: Function:
5.0 s* [0.0 -
10.0 s]
The time, from the start signal is given until
the speed exceeds the speed set in
1-77 Compressor Start Max Speed [RPM] must
not exceed the time set in the parameter or
the frequency converter will trip with an alarm
[A18] Start Failed.
Any time set in 1-71 Start Delay for use of a
start function must be executed within the
time limit.
NOTE
1-79 Compressor Start Max Time to Trip will not have effect
when 1-10 Motor Construction = [1] PM, non salient SPM.
3.3.9 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 1-81 Min
Speed for Function at Stop [RPM].
Available selections depend on 1-10 Motor
Construction:
[0] Asynchron:
[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
Energizes motor with a DC holding current
(see 2-00 DC Hold/Preheat Current).
[2] Motor
check,
warning
Issues a warning if the motor is not
connected.
[6] Motor
check, alarm
Issues an alarm if the motor is not connected.
1-81 Min Speed for Function at Stop [RPM]
Range: Function:
Size related* [0 - 600 RPM]
Set the speed at which to activate
1-80 Function at Stop.
1-82 Min Speed for Function at Stop [Hz]
Range: Function:
Size related* [ 0.0 - 20.0 Hz] Set the output frequency at which
to activate 1-80 Function at Stop.
3.3.10 Trip at Motor Speed Low Limit
In 4-11 Motor Speed Low Limit [RPM] and 4-12 Motor Speed
Low Limit [Hz] it is possible to set a minimum speed for
the motor in order to ensure proper oil distribution.
In some cases e.g. 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 trip limit. If
the motor speed drops below this limit, the frequency
converter will trip and issue an alarm (A49).
Reset will take place according to the selected function in
14-20 Reset Mode.
If the trip must take place at a rather exact speed (RPM), it
is recommended to set 0-02 Motor Speed Unit for RPM and
use slip compensation, which can be set in 1-62 Slip
Compensation.
NOTE
To achieve the highest accuracy with the slip compen-
sation, an Automatic Motor Adaptation (AMA) should be
performed. To be enabled in 1-29 Automatic Motor
Adaptation (AMA).
NOTE
Trip will not be active when using a normal stop- or coast
command.
1-86 Trip Speed Low [RPM]
Range: Function:
Size
related*
[ 0 - par.
4-13 RPM]
Set the desired motor speed for trip
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 frequency converter will
trip with an alarm [A49] Speed Limit.
Function at stop.
NOTE
This parameter is only available if 0-02 Motor Speed Unit is
set to [RPM].
1-87 Trip Speed Low [Hz]
Range: Function:
Size
related*
[ 0.0 -
par. 4-14
Hz]
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 frequency
converter will trip with an alarm [A49]
Speed Limit. Function at stop.
Parameter Description
VLT
®
HVAC Drive Programming Guide
46 MG11CD02 - VLT
®
is a registered Danfoss trademark
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