Danfoss VLT Automation Drive FC 360 Programming Manual page 37

Parameter Descriptions
1-75 Start Speed [Hz]
Range: Function:
Size [ 0 - This parameter can be used for hoist
related 10 Hz] applications (cone rotor). Set a motor start
*
speed. After the start signal, the output speed
leaps to the set value. Set the start function
in parameter 1-72 Start Function to [3] Start
speed cw, [4] Horizontal operation or [5] VVC
clockwise, and set a start delay time in
parameter 1-71 Start Delay.
1-76 Start Current
Range: Function:
Size [ 0 - Some motors, for example, cone rotor
related 10000 A] motors, need extra current/starting speed
*
to disengage the rotor. To obtain this boost,
set the required current in this parameter.
Set parameter 1-72 Start Function to [3] Start
speed cw or [4] Horizontal operation, and set
a start delay time in parameter 1-71 Start
Delay.
1-78 Compressor Start Max Speed [Hz]
Range: Function:
0 Hz [ 0 - This parameter enables high starting torque. This
*
650 Hz] function ignores current limit and torque limit
during start of the motor. The time from the
start signal is given until the speed exceeds the
speed set in this parameter becomes a start zone
where the current limit and motoric torque limit
are set to what is maximum possible for the
frequency converter/motor combination. The
time without protection from the current limit
and torque limit must not exceed the value set
in parameter 1-79 Compressor Start Max Time to
Trip. Otherwise, the frequency converter trips
with Alarm 18, Start Failed.
1-79 Compressor Start Max Time to Trip
Range: Function:
5 s [0 - The time, from the start signal is given until the
*
10 s] speed exceeds the speed set in
parameter 1-78 Compressor Start Max Speed [Hz],
must not exceed the time set in this parameter.
Otherwise, the frequency converter trips with
Alarm 18, Start Failed. Any time set in
parameter 1-71 Start Delay for use of a start
function must be executed within the time limit.
MG06C602
Programming Guide
4.2.9 1-8* Stop Adjustments
Parameters for adjusting motor stop settings.
1-80 Function at Stop
Option:
+
[0] Coast
*
[1] DC hold /
Motor
Preheat
[3] Pre-
magnetizing
Danfoss A/S © 7/2015 All rights reserved.
Function:
Select the frequency converter function after
a stop command or after the speed is
ramped down to the settings in
parameter 1-82 Min Speed for Function at Stop
[Hz].
Available selections depend on
parameter 1-10 Motor Construction.
[0] Asynchron
[0] Coast
[1] DC hold
[2] Motor check, warning
[6] Motor check, alarm
[1] PM, non salient SPM, non Sat
[2] PM, salient IPM, non Sat
[3] PM, salient IPM, Sat
[0] Coast
Leaves the motor in free mode.
Energises the motor with a DC hold current
(see parameter 2-00 DC Hold/Motor Preheat
Current.
Builds up a magnetic field while the motor is
stopped. This allows the motor to produce
torque quickly at commands (asynchronous
motors only). This pre-magnetising function
does not help the very first start command.
Two different solutions are available to pre-
magnetise the machine for the first start
command.
1. Start the frequency converter with a
0 RPM reference and wait 2 to 4
rotor time constants (see below)
before increasing the speed
reference.
2. 2a Set parameter 1-71 Start
Delay to the pre-magnetise
time (2 to 4 rotor time
constants).
2b Set parameter 1-72 Start
Function to [0] DC hold.
Set the DC-hold current magnitude
(parameter 2-00 DC Hold/Motor
Preheat Current to be equal to I
= U /(1.73 x Xh)
mag nom
Sample rotor time constants =
(Xh+X2)/(6.3*Freq_nom*Rr)
4 4
pre-
35