Bit 00/01:
Bit 00/01 is used to select between the two pre-pro-
grammed references (parameters 215-218
Preset ref-
erence
) according to the following table:
Preset ref.
Parameter
Bit 01
Bit 00
1
215
0
0
2
216
0
1
3
217
1
0
4
218
1
1
NB!
In parameter 508
Selection of preset ref-
erence
a selection is made to define how
Bit 00/01 gates with the corresponding
function on the digital inputs.
Bit 02, DC brake:
Bit 02 = '0' leads to DC braking and stop. Braking cur-
rent and duration are set in parameters 125 and 126.
Bit 02 = '1' leads to ramping.
Bit 03, Coasting stop:
Bit 03 = '0' causes the frequency converter to imme-
diately "let go" of the motor (the output transistors are
"shut off"), so that it coasts to a standstill.
Bit 03 = '1' causes the frequency converter to be able
start the motor if the other starting conditions have
been fulfilled. Note: In parameter 502
Coasting stop
a
selection is made to define how Bit 03 gates with the
corresponding function on a digital input.
Bit 04, Quick stop:
Bit 04 = '0' causes a stop, in which the motor's speed
is ramped down to stop via parameter 212
Quick stop
ramp-down time
.
Bit 05, Freeze output frequency:
Bit 05 = '0' causes the present output frequency (in Hz)
to freeze. The frozen output frequency can now only
be changed by means of the digital inputs program-
med to
Speed up
and
Speed down
.
NB!
If
Freeze output
is active, the frequency
converter cannot be stopped via Bit 06
Start
or via a digital input. The frequency
converter can only be stopped by the fol-
lowing:
•
Bit 03 Coasting stop
•
Bit 02 DC braking
•
Digital input programmed to
DC
braking
,
Coasting stop
or
Reset
and coasting stop
.
VLT
®
5000 Design Guide
MG.52.B2.02 - VLT
®
is a registered Danfoss trademark
89
Se
rial comm
unica
ti
on
