Danfoss FC 300 Design Manual page 283

FC 300 Design Guide
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
10 Data invalid
11 No function
12 No function
13 Parameter set-up
14 Parameter set-up
15 No function
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 par.
3-10 Preset reference according to the following table:
Programmed ref. value
1
2
3
4
NB!
Make a selection in par. 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 par. 2-01 DC Brake Cur-
rent 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.
NB!
Make a selection in par. 8-50 Coasting Select to define how Bit 03 gates with the correspond-
ing function on a digital input.
Bit 04, Quick stop:
Bit 04 = '0': Makes the motor speed ramp down to stop (set in par. 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 by
means of the digital inputs (par. 5-10 to 5-15) programmed to Speed up and Slow down.
NB!
If Freeze output is active, the frequency converter can only be stopped by the following:
• Bit 03 Coasting stop
RS-485 Installation and Set-up
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
selection msb
Reverse
Par.
3-10 [0]
3-10 [1]
3-10 [2]
3-10 [3]
MG.33.B7.02 - VLT is a registered Danfoss trademark
Bit 01 Bit 00
0 0
0 1
1 0
1 1
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