1-78 Compressor Start Max Speed [Hz]
Range:
Function:
various tricks can be done through clever use
of start delay/start speed/start current.
NOTE
1-78 Compressor Start Max Speed [Hz]
will not have effect
when
= [1] PM, non salient SPM.
1-79 Compressor Start Max Time to Trip
Range:
Function:
5 s
*
[0 - 10
s]
The time, from the start signal is given until the
speed exceeds the speed set in
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] 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
:
[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.
1-81 Min Speed for Function at Stop [RPM]
Range:
Function:
Size related
*
[0 - 600 RPM] Set the speed at which to activate
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
.
1-86 Compressor Min. Speed for Trip [rpm]
Range:
Function:
0 rpm
*
[0.0 -
1-77 minus
100 rpm]
When “High Starting Torque” is activated by
setting of
1-77 Compressor Start Max Speed
then a protection functionality is also
enabled to prevent the application from
running below minimum motor speed e.g.
when in current limit.
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
.
1-87 Compressor Min. Speed for Trip [Hz]
Range:
Function:
0 Hz
*
[0.0 - 1-78
minus ??? Hz]
When “High Starting Torque” is activated
by setting of
then a protection functionality
is also enabled to prevent the application
from running below minimum motor
speed e.g. when in current limit.
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
.
3.3.10 1-9* Motor Temperature
1-90 Motor Thermal Protection
Option:
Function:
The frequency converter determines the motor
temperature for motor protection in two
different ways:
•
Via a thermistor sensor connected to
one of the analog or digital inputs
(
•
Via calculation (ETR = Electronic
Thermal Relay) of the thermal load,
based on the actual load and time.
The calculated thermal load is comed
with the rated motor current I
M,N
and
the rated motor frequency f
M,N
. The
calculations estimate the need for a
lower load at lower speed due to less
cooling from the fan incorporated in
the motor.
[0] No
protection
If the motor is continuously overloaded and no
warning or trip of frequency converter is
wanted.
ETR (Electronic Thermal Relay) functions 1-4 will calculate
the load when set-up where they were selected is active.
Parameter Description
VLT
®
Refrigeration Drive Programming Guide
46
MG16H102 - VLT
®
is a registered Danfoss trademark
3
3
