99
MG.30.A7.02 - VLT
®
is a registered Danfoss trademark
Parameter description
3.. Functions and timers
Value:
0.0 - 60.0 sec.
✭
0
Value:
0.0 - f
RANGE
✭
1.0
Value:
0 - 50 V
306
DC braking time
(DC-brake time)
307
DC brake cut-in
frequency at stop
(DC-brk on freq)
308
DC brake voltage
(DC-brk voltage)
✮
= Factory setting. Text in ( ) = Display text.
The figures in [ ] are used in bus communication.
✭
Depending
on unit
If the stator in an asynchronous motor is
supplied with D.C. voltage, a braking
torque will arise. Select the duration of the
impressed D.C. current injection (306). Pay
attention to the motor’s power set-off.
Thermal motor protection is also updated
at DC braking.
Select at what output frequency the D.C.
brake is to be activated on ramp-down to
stop (para. 307). Parameters 306 and 307
must be other than 0 to activate the D.C.
brake. The D.C. brake can also be acti-
vated via terminal 27 (parameter 404).
The brake torque depends on the selected
D.C. brake voltage (para. 308).
Warning:
An excessive value can damage the motor
due to overheating.
A start signal must be present after power-
up to provide DC-braking by means of a
stop signal.
Software version 3.11
Value:
0.0 - 50.0 V
✭
0.0
If the frequency converter is to reset
automatically, select automatic reset 1-10.
Warning:
The motor can start without
warning. Select how many times the
frequency converter is to reset auto-
matically after cut-out within 20 min.
Start disabled blocks re-start after trip-
ping.
Start disabled functions only in connection
with serial communication, since re-start is
only possible via the bus.
If start disabled is used
without simultane-
ous use of the bus, re-start is disabled.
Start disabled provides for application of
the status table as in PROFIBUS when the
control word is ON1, ON2 and ON3.
The status table can be found in PROFI-
BUS literature, MG.10.AX.02.
Value:
✭
Manual reset (manual)
[0]
Auto reset (automatic x 1)
[1]
Auto reset (automatic x 2)
[2]
Auto reset (automatic x 3)
[3]
Auto reset (automatic x 4)
[4]
Auto reset (automatic x 5)
[5]
Auto reset (automatic x 6)
[6]
Auto reset (automatic x 7)
[7]
Auto reset (automatic x 8)
[8]
Auto reset (automatic x 9)
[9]
Auto reset (automatic x 10)
[10]
Start disabled (start bloc.)
[11]
309
Reset mode
(Reset mode)
Value:
0 - 60 sec.
✭
OFF
When the frequency converter registers
that the output current has exceeded the
current limit I
LIM
(parameter 209) it will await
a trip. Record for how long you want the
frequency converter to wait before
tripping out. OFF signifies that the time is
infinite.
310
Trip delay at current
limit
(Trip [email protected])
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