1-71 Start Delay
Range:
Function:
28-91 Delayed Compressor Start
controls the
delayed start feature. If
28-91 Delayed Compressor
Start
is set then delayed start is activated. If
28-91 Delayed Compressor Start
is reset then
delayed start is deactivated. It is recommended
that the start delay value should be set equal to
or greater than default value.
1-72 Start Function
Option:
Function:
Select the start function during start delay. This
parameter is linked to
1-71 Start Delay
.
[0]
DC Hold/
Motor
Preheat
Energizes motor with a DC holding current
(
) during the start
delay time.
[1]
DC Brake
Energizes motor with a DC braking current
(
) during the start delay
time.
[2]
*
Coast
Releases shaft coasted converter during the
start delay time (inverter off).
Available selections depend on
[0] Asynchron
:
[2] coast
[0] DC-hold
[1] PM non salient:
[2] coast
[3]
Start speed
cw
Only possible with VVC
plus
.
Connect the function described in
1-74 Start
Speed [RPM]
and
1-76 Start Current
in the start
delay time.
Regardless of the value applied by the
reference signal, the output speed applies the
setting of the start speed in
1-74 Start Speed
[RPM]
or
1-75 Start Speed [Hz]
and the output
current corresponds to the setting of the start
current in
1-76 Start Current
. This function is
typically used in hoisting applications without
counterweight and especially in applications
with a Cone-motor, where the start is
clockwise, followed by rotation in the reference
direction.
[5]
VVC+/Flux
clockwise
For the function described in
1-74 Start Speed
[RPM]
(
Start speed in the start delay time
). The
start current is calculated automatically. This
function uses the start speed in the start delay
time only. Regardless of the value set by the
reference signal, the output speed equals the
setting of the start speed in
1-74 Start Speed
[RPM]
.
[3] Start speed/current clockwise
and
[5]
VVC
plus
/Flux clockwise
are typically used in
1-72 Start Function
Option:
Function:
hoisting applications.
[4] Start speed/current in
reference direction
is icularly used in
applications with counterweight and horizontal
movement.
1-73 Flying Start
Option:
Function:
This function makes it possible to catch a motor
which is spinning freely due to a mains drop-out.
When
is enabled,
1-71 Start Delay
has no function.
Search direction for flying start is linked to the
setting in
.
[0] Clockwise
: Flying start search in clockwise
direction. If not successful, a DC brake is carried
out.
[2] Both Directions
: The flying start will first make a
search in the direction determined by the last
reference (direction). If not finding the speed it
will make a search in the other direction. If not
successful, a DC brake will be activated in the
time set in
. Start will then
take place from 0 Hz.
[0]
*
Disabled Select
[0] Disable
if this function is not required
[1] Enabled Select
[1] Enable
to enable the frequency
converter to “catch” and control a spinning motor.
The parameter is always set to
[1] Enable
when
= [1] PM non salient.
Important related parameters:
•
1-58 Flystart Test Pulses Current
•
1-59 Flystart Test Pulses Frequency
•
•
•
•
2-03 DC Brake Cut In Speed [RPM]
•
2-04 DC Brake Cut In Speed [Hz]
•
•
The Flystart function used for PM motors is based on an
initial speed estimation. The speed will always be
estimated as the first thing after an active start signal is
given. Based on the setting of
the
following will happen:
=
[0] Rotor Detection
:
If the speed estimate comes out as greater than 0 Hz the
frequency converter will catch the motor at that speed and
resume normal operation. Otherwise, the frequency
Parameter Description
VLT
®
Refrigeration Drive Programming Guide
44
MG16H102 - VLT
®
is a registered Danfoss trademark
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