Danfoss VLT FC51 Design Manual page 82

RS-485 Installation and Set...
Master-follower
Bit
no.: 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Illustration 8.14
Bit Bit value=0
00 Reference value
01 Reference value
02 DC brake
03 Coasting
04 Quick stop
05 Hold output
frequency
06 Ramp stop
07 No function
08 No function
09 Ramp 1
8 8
10 Data invalid
11 Relay 01 open
12 Relay 02 open
13 Parameter set-up
15 No function
Table 8.35 Definition of Control Bits
Explanation of the Control Bits
Bits 00/01
Bits 00 and 01 are used to select between the 4 reference
values, which are pre-programmed in 3-10 Preset Reference
according to the Table 8.36.
Programmed
ref. value
1
2
3
4
Table 8.36 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.
80
CTW Speed ref.
Bit value=1
external selection lsb
external selection msb
Ramp
No coasting
Ramp
use ramp
Start
Reset
Jog
Ramp 2
Data valid
Relay 01 active
Relay 02 active
selection lsb
Reverse
Parameter
3-10 Preset Reference [0]
3-10 Preset Reference [1]
3-10 Preset Reference [2]
3-10 Preset Reference [3]
®
VLT Micro Drive FC 51 Design Guide
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.
NOTICE
If Freeze output is active, the frequency converter can
only be stopped by the following:
•
•
•
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
Bit Bit
06='1': Permits the Frequency converter to start the motor,
01 00
if the other starting conditions are met.
0 0
Make a selection in 8-53 Start Select to define how Bit 06
0 1
Ramp stop/start gates with the corresponding function on
1 0
a digital input.
1 1
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.
Bit 10, Data not valid/Data valid
Tell the frequency converter whether to use or ignore the
control word.
MG02K302 - Rev. 2013-12-03
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.