1-75 Start Speed [Hz]
Range:
Function:
Size
related
*
[ 0 -
10 Hz]
This parameter can be used for hoist
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
to
[3] Start
speed cw
,
[4] Horizontal operation
or
[5] VVC
+
clockwise
, and set a start delay time in
.
1-76 Start Current
Range:
Function:
Size
related
*
[ 0 -
10000 A]
Some motors, for example, cone rotor
motors, need extra current/starting speed
to disengage the rotor. To obtain this boost,
set the required current in this parameter.
Set
to
[3] Start
speed cw
or
[4] Horizontal operation
, and set
a start delay time in
.
1-78 Compressor Start Max Speed [Hz]
Range:
Function:
0 Hz
*
[ 0 -
650 Hz]
This parameter enables high starting torque. This
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
. Otherwise, the frequency converter trips
with
Alarm 18, Start Failed
.
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
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
for use of a start
function must be executed within the time limit.
4.2.9 1-8* Stop Adjustments
Parameters for adjusting motor stop settings.
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
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
[0]
*
Coast
Leaves the motor in free mode.
[1] DC hold /
Motor
Preheat
Energises the motor with a DC hold current
(see
parameter 2-00 DC Hold/Motor Preheat
[3] Pre-
magnetizing
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
to the pre-magnetise
time (2 to 4 rotor time
constants).
2b
Set
to
[0] DC hold
.
Set the DC-hold current magnitude
(
to be equal to I
pre-
mag
= U
nom
/(1.73 x Xh)
Sample rotor time constants =
(Xh+X2)/(6.3*Freq_nom*Rr)
Parameter Descriptions
Programming Guide
MG06C602
Danfoss A/S © 7/2015 All rights reserved.
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