Danfoss VLT AutomationDrive FC 301 Programming Manual page 57

Parameter Descriptions
1-69 System Inertia
Range: Function:
NOTICE
Size [0000 -
related 10000.0000
*
Valid for FC 302 only.
kgm²]
This parameter cannot be
adjusted while motor is
running.
Active in flux open loop only. Used
to compute the acceleration torque
at low speed. Used in the torque
limit controller.
3.3.10 1-7* Start Adjustments
1-70 PM Start Mode
Select the start-up mode. This is done to initialize the VVC
control core for previously free-running motor. Both selections
estimate the speed and angle. Active for PM and SynRM motors
+
in VVC only.
Option: Function:
[0] Rotor Detection Estimates the electrical angle of the rotor
*
and uses this as a starting point. Standard
selection for VLT
applications.
[1] Parking The parking function applies DC current
across the stator winding and rotates the
rotor to electrical 0 position (typically
selected for HVAC applications). Parking
current and time are configured in
parameter 2-06 Parking Current and
parameter 2-07 Parking Time.
1-71 Start Delay
Range: Function:
0 s [0 - 25.5 s] This parameter refers to the start function
*
selected in parameter 1-72 Start Function.
Enter the time delay required before
commencing acceleration.
1-72 Start Function
Option: Function:
Select the start function during start delay.
This parameter is linked to
parameter 1-71 Start Delay.
[0] DC Hold/ Energizes motor with a DC hold current
delay time (parameter 2-00 DC Hold Current) during the
start delay time.
[1] DC Brake/ Energizes motor with a DC brake current
delay time (parameter 2-01 DC Brake Current) during the
start delay time.
MG33ML02
Programming Guide
+
®
AutomationDrive
Danfoss A/S © 02/2016 All rights reserved.
1-72 Start Function
Option: Function:
[2] Coast/delay Motor coasted during the start delay time
time (inverter off).
*
[3] Start speed
Only possible with VVC
cw
Connect the function described in
parameter 1-74 Start Speed [RPM] and
parameter 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
parameter 1-74 Start Speed [RPM] or
parameter 1-75 Start Speed [Hz], and the
output current corresponds to the setting of
the start current in parameter 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.
[4] Horizontal
Only possible with VVC
operation
For obtaining the function described in
parameter 1-74 Start Speed [RPM] and
parameter 1-76 Start Current during the start
delay time. The motor rotates in the reference
direction. If the reference signal equals zero
(0), parameter 1-74 Start Speed [RPM] is ignored
and the output speed equals zero (0). The
output current corresponds to the setting of
the start current in parameter 1-76 Start
Current.
[5] VVC+/Flux For the function described in
clockwise parameter 1-74 Start Speed [RPM] only. 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
parameter 1-74 Start Speed [RPM]. [3] Start
speed/current clockwise and [5] VVC
clockwise are typically used in hoisting
applications. [4] Start speed/current in reference
direction is particularly used in applications
with counterweight and horizontal movement.
[6] Hoist Mech. For utilizing mechanical brake control
Brake Rel functions (parameter 2-24 Stop Delay to
parameter 2-28 Gain Boost Factor). This
parameter is only active in flux control
principle, in a mode with motor feedback or
sensorless mode.
[7] VVC+/Flux
counter-cw
+ .
3
+
.
+
/Flux
55
3