Danfoss VLT FC 103 Programming Manual page 45

Parameter Description
1-71 Start Delay
Range:
3 3
1-72 Start Function
Option:
[0] DC Hold/
Motor
Preheat
[1] DC Brake
[2] Coast
*
[3] Start speed
cw
[5] VVC+/Flux
clockwise
44
VLT
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.
Function:
Select the start function during start delay. This
parameter is linked to 1-71 Start Delay.
Energizes motor with a DC holding current
(2-00 DC Hold/Preheat Current) during the start
delay time.
Energizes motor with a DC braking current
(2-01 DC Brake Current) during the start delay
time.
Releases shaft coasted converter during the
start delay time (inverter off).
Available selections depend on 1-10 Motor
Construction:
[0] Asynchron:
[2] coast
[0] DC-hold
[1] PM non salient:
[2] coast
plus
Only possible with VVC .
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.
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]
plus
VVC /Flux clockwise are typically used in
MG16H102 - VLT
®
Refrigeration Drive Programming Guide
1-72 Start Function
Option:
1-73 Flying Start
Option:
[0] Disabled Select [0] Disable if this function is not required
*
[1] Enabled Select [1] Enable to enable the frequency
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 1-70 PM Start Mode the
following will happen:
1-70 PM Start Mode = [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
®
is a registered Danfoss trademark
Function:
hoisting applications. [4] Start speed/current in
reference direction is icularly used in
applications with counterweight and horizontal
movement.
Function:
This function makes it possible to catch a motor
which is spinning freely due to a mains drop-out.
When 1-73 Flying Start is enabled, 1-71 Start Delay
has no function.
Search direction for flying start is linked to the
setting in 4-10 Motor Speed Direction.
[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 2-02 DC Braking Time. Start will then
take place from 0 Hz.
converter to "catch" and control a spinning motor.
The parameter is always set to [1] Enable when
1-10 Motor Construction = [1] PM non salient.
Important related parameters:
•
1-58 Flystart Test Pulses Current
•
1-59 Flystart Test Pulses Frequency
•
1-70 PM Start Mode
•
2-06 Parking Current
•
2-07 Parking Time
•
2-03 DC Brake Cut In Speed [RPM]
•
2-04 DC Brake Cut In Speed [Hz]
•
2-06 Parking Current
•
2-07 Parking Time