Bit
Bit value=0
Bit value=1
00
Reference value
external selection lsb
01
Reference value
external selection msb
02
DC brake
Ramp
03
Coasting
No coasting
04
Quick stop
Ramp
05
Hold output
frequency
use ramp
06
Ramp stop
Start
07
No function
Reset
08
No function
Jog
09
Ramp 1
Ramp 2
10
Data invalid
Data valid
11
Relay 01 open
Relay 01 active
12
Relay 02 open
Relay 02 active
13
Parameter set-up
selection lsb
15
No function
Reverse
Table 8.36
Explanation of the Control Bits
Bits 00/01
Bits 00 and 01 are used to choose between the four
reference values, which are pre-programmed in
3-10 Preset
Reference
according to the
Table 8.37
.
Programmed
ref. value
Parameter
Bit
01
Bit
00
1
3-10 Preset Reference
[0]
0
0
2
3-10 Preset Reference
[1]
0
1
3
3-10 Preset Reference
[2]
1
0
4
3-10 Preset Reference
[3]
1
1
Table 8.37 Control bits
NOTE
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 frequency converter immediately "lets go"
of the motor, (the output transistors are "shut off") and it
coasts to a standstill.
Bit 03=’1’: The frequency converter 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
5-13 Terminal 29
Digital Input
) programmed to
Speed up=21
and
Slow
down=22
.
NOTE
If Freeze output is active, the frequency converter can only
be stopped by the following:
•
Bit 03 Coasting stop
•
Bit 02 DC braking
•
Digital input (
5-10 Terminal 18 Digital Input
to
5-13 Terminal 29 Digital Input
) programmed to
DC
braking=5
,
Coasting stop=2
, or
Reset and coasting
stop=3
.
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 Frequency converter 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 signal’s
leading edge, i.e. when changing from logic ’0’ to logic ’1’.
Bit 08, Jog
Bit 08=’1’: The output frequency is determined by
3-11 Jog
Speed [Hz]
.
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.
RS-485 Installation and Set...
VLT
®
Micro Drive FC 51 Design Guide
MG02K202 - VLT
®
is a registered Danfoss trademark
85
8
8
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