VLT
®
6000 HVAC
108
★
= factory setting. ( ) = display text [ ] = value for use in communication via serial communication port
MG.60.B1.02 - VLT is a registered Danfoss trade mark
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Application functions 400-427
In this parameter group,
the special functions of
the VLT frequency
converter are set up, e.g.
PID regulation, setting of
the feedback range and the Setup of the Sleep mode
function.
Additionally, this parameter group includes:
-
Reset function.
-
Flying start.
-
Option of interference reduction method.
-
Setup of any function upon loss of load, e.g.
because of a damaged V-belt.
-
Setting of switching frequency.
-
Selection of process units.
400 Reset function (RESET FUNCTION)
Value:
★
Manual reset (MANUAL RESET)
[0]
Automatic reset x 1 (AUTOMATIC X 1)
[1]
Automatic reset x 2 (AUTOMATIC X 2)
[2]
Automatic reset x 3 (AUTOMATIC X 3)
[3]
Automatic reset x 4 (AUTOMATIC X 4)
[4]
Automatic reset x 5 (AUTOMATIC X 5)
[5]
Automatic reset x 10 (AUTOMATIC X 10)
[6]
Automatic reset x 15 (AUTOMATIC X 15)
[7]
Automatic reset x 20 (AUTOMATIC X 20)
[8]
Function:
This parameter allows a choice of whether to reset
and restart manually after a trip, or whether the VLT
frequency converter is to be reset and restarted
automatically. In addition, there is a choice of the
number of times the unit is to try a restart. The time
between each try is set in parameter 401
Automatic
restart time
.
Description of choice:
If
Manual reset
[0] is selected, resetting must be
effected via the "Reset" key or via a digital input.
If the VLT frequency converter is to carry out an
automatic reset and restart after a trip, select data
value [1]-[8].
The motor may start without warning.
401 Automatic restart time
(AUTORESTART TIME)
Value:
0 - 600 sec.
★
10 sec.
Function:
This parameter allows setting of the time from tripping
until the automatic reset function begins.
It is assumed that automatic reset has been selected
in parameter 400
Reset function
.
Description of choice:
Set the desired time.
402 Flying start
(FLYING START)
Value:
Disable (DISABLE)
[0]
★
Enable (ENABLE)
[1]
DC brake and start (DC BRAKE AND START)
[3]
Function:
This function makes it possible for the VLT frequency
converter to ‘catch’ a spinning motor, which - e.g.
because of a mains failure - is no longer controlled by
the VLT frequency converter.
This function is activated whenever a start command
is active.
For the VLT frequency converter to be able to catch
the spinning motor, the motor speed must be lower
than the frequency that corresponds to the frequency
in parameter 202
Output frequency high limit, f
MAX
.
Description of choice:
Select
Disable
[0] if this function is not required.
Select
Enable
[1] if the VLT frequency converter is to
be able to ‘catch’ and control a spinning motor.
Select
DC brake and start
[2] if the VLT frequency
converter is to brake the motor by means of the DC
brake first, and then start. It is assumed that
parameters 114-116
DC braking
are enabled. In the
case of a substantial ‘windmilling’ effect (spinning
motor), the VLT frequency converter is not able to
‘catch’ a spinning motor unless
DC brake and start
has been selected.
