Table of Contents
Advertisement
Special functions
400 Brake function
(BRAKE FUNCTION)
Value:
Off (OFF)
Resistor brake (RESISTOR)
AC brake (AC BRAKE)
Load sharing (LOAD SHARING)
Factory setting depends on unit type.
Function:
Resistor brake [1] is selected if the adjustable
frequency drive has an integral brake transistor
and the brake resistor is connected to terminals
81, 82. A higher intermediate circuit voltage is
permitted during braking (generated operation)
when a brake resistor is connected.
AC brake [4] can be selected to improve braking
without using brake resistors. Please note that AC
brake [4] is not as effective as Resistor brake [1].
Description of choice:
Select Resistor brake [1] if a brake resistor is connected.
Select AC brake [4] if short-term generated loads occur.
See parameter 144 Gain AC brake to set the brake.
Select Load sharing [5] if this is used.
NOTE
A change of selection will not become
active until the AC line voltage has been
disconnected and reconnected.
405 Reset function
(RESET MODE)
Value:
Manual reset (MANUAL RESET)
Automatic reset x 1
(AUTOMATIC X 1)
Automatic reset x 3
(AUTOMATIC X 3)
Automatic reset x 10
(AUTOMATIC X 10)
Reset at power-up
(RESET AT POWER UP)
= factory setting. () = display text [] = value for use in communication via serial communication port
MG.28.A8.22 - VLT is a registered Danfoss trademark
VLT® 2800 Series
Function:
This parameter makes it possible to select whether
reset and restart after a trip are to be manual or
whether the variable frequency drive is to be reset and
restarted automatically. Furthermore, it is possible
to select the number of times a restart is to be
[0]
attempted. The time between each attempt is set
[1]
in parameter 406 Automatic restart time.
[4]
[5]
Description of choice:
If Manual reset [0] is selected, reset is to be carried
out via the [STOP/RESET] key, a digital input or
serial communication. If the variable frequency drive
is to carry out an automatic reset and restart after
a trip, select data value [1], [3] or [10].
If Reset at power-up [11] is selected, the variable
frequency drive will carry out a reset if there has been
a fault in connection with the AC line failure.
The motor may start without warning.
406 Automatic restart time
(AUTORESTART TIME)
Value:
0 - 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 405 Reset function.
Description of choice:
Set the required time.
[0]
409 Trip delay overcurrent, I
(TRIP DELAY CUR.)
[1]
Value:
0 - 60 sec. (61=OFF)
[3]
Function:
[10]
When the variable frequency drive registers that
the output current has reached the current limit
[11]
I
(parameter 221 Current limit) and remains
LIM
there for the preset time, it is disconnected. Can
5 sec.
LIM
OFF
67
Advertisement
Table of Contents
