Bits 00/01
Bits 00 and 01 are used to select between the four
reference values, which are pre-programmed in
3-10 Preset
Reference
according to
.
Programmed
reference value
Parameter
Bit 01
Bit 00
1
[0] 3-10 Preset
Reference
0
0
2
[1] 3-10 Preset
Reference
0
1
3
[2] 3-10 Preset
Reference
1
0
4
[3] 3-10 Preset
Reference
1
1
Table 10.19 Control Bits
NOTICE!
Make a selection in
8-56 Preset Reference Select
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. Set braking
current and duration in
2-01 DC Brake Current
and
2-02 DC
Braking Time
.
Bit 02=’1’ leads to ramping.
Bit 03, Coasting
Bit 03=’0’: The adjustable frequency drive immediately "lets
go" of the motor (the output transistors are "shut off") and
it coasts to a standstill.
Bit 03=’1’: The adjustable frequency drive starts the motor
if the other starting conditions are met.
Make a selection in
8-50 Coasting Select
to define how Bit
03 gates with the corresponding function on a digital
input.
Bit 04, Quick stop
Bit 04=’0’: Makes the motor speed ramp down to stop (set
in
3-81 Quick Stop Ramp Time
).
Bit 05, Hold output frequency
Bit 05=’0’: The present output frequency (in Hz) freezes.
Change the frozen output frequency only with the digital
inputs (
5-10 Terminal 18 Digital Input
to
5-15 Terminal 33
Digital Input
) programmed to
Speed up
and
Slow down
.
NOTICE!
If freeze output is active, only the following conditions
can stop the adjustable frequency drive:
•
Bit 03 Coasting stop.
•
Bit 02 DC braking.
•
Digital input (
5-10 Terminal 18 Digital Input
to
5-15 Terminal 33 Digital Input
) programmed to
DC braking
,
Coasting stop
, or
Reset
and
coasting
stop
.
Bit 06, Ramp stop/start
Bit 06=’0’: Causes a stop and makes the motor speed ramp
down to stop via the selected ramp-down parameter.
Bit 06=’1’: Permits the adjustable frequency drive to start
the motor, if the other starting conditions are met.
Make a selection in
8-53 Start Select
to define how Bit 06
Ramp stop/start gates with the corresponding function on
a digital input.
Bit 07, Reset:
Bit 07=’0’: No reset.
Bit 07=’1’: Resets a trip. Reset is activated on the leading
edge of the signal, that is, when changing from logic ’0’ to
logic ’1’.
Bit 08, Jog
Bit 08=’1’: The output frequency depends on
3-19 Jog Speed
[RPM]
.
Bit 09, Selection of ramp 1/2
Bit 09="0": Ramp 1 is active (
3-41 Ramp 1 Ramp-up Time
to
3-42 Ramp 1 Ramp-down Time
).
Bit 09="1": Ramp 2 (
3-51 Ramp 2 Ramp-up Time
to
3-52 Ramp 2 Ramp-down Time
) is active.
Bit 10, Data not valid/Data valid
Tell the adjustable frequency drive whether to use or
ignore the control word. Bit 10=’0’: The control word is
ignored.
Bit 10=’1’: The control word is used. This function is
relevant because the message always contains the control
word, regardless of the message type. Thus, it is possible
to turn off the control word if not in use when updating or
reading parameters.
RS-485 Installation and Set...
Design Guide
MG34S222
Danfoss A/S © Rev. 2014-02-10 All rights reserved.
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Summary of Contents for VLT AutomationDrive FC 300
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