Special Functions - Danfoss VLT 2800 Series Operating Instructions Manual

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 frequency converter
has an integral brake transistor and 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 with-
out 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 connec-
ted.
Select AC brake [4] if short-term generated loads oc-
cur. See parameter 144 Gain AC brake to set the brake.
Select Load sharing [5] if this is used.
NB!
A change of selection will not become ac-
tive until the mains voltage has been dis-
connected 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
44
VLT
Function:
This parameter makes it possible to select whether re-
set and restart after a trip are to be manual or whether
the frequency converter is to be reset and restarted
automatically. Furthermore, it is possible to select the
number of times a restart is to be attempted. The time
[0]
between each attempt is set in parameter 406 Auto-
matic restart time.
[1]
[4]
Description of choice:
[5]
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 frequency converter 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 frequency
converter will carry out a reset if there has been a fault
in connection with the mains 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.
409 Trip delay overcurrent, I
[0]
(trip delay cur.)
Value:
[1]
0 - 60 sec. (61=OFF)
Function:
[3]
When the frequency converter registers that the output
current has reached the current limit I
[10]
221 Current limit) and remains there for the preset
time, it is disconnected. Can be used to protect the
[11]
application, like the ETR will protect the motor if se-
lected.
MG.27.A2.02 - VLT
®
2800 Series
LIM
(parameter
LIM
®
is a registered Danfoss trademark
5 sec.
OFF