Operating instructions

4.5. Danfoss FC Control Profile
4.5.1. Control Word according to FC Profile (CTW)
To select FC protocol in the control word, par. 8-10 Control word profile must be set to FC protocol
[0]. The control word is used to send commands from a master (PLC or PC) to a slave (frequency
converter).
Please refer to
Application Examples for an example of a control word telegram using PPO type
3.
Bit
Bit value = 0 Bit value = 1
00 Reference value external selec-
tion lsb
01 Reference value external selec-
tion msb
02 DC brake Ramp
03 Coasting No coasting
04 Quick stop Ramp
05 Hold output fre-
quency
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 No function Relay 01 active
12 No function Relay 04 active
13 Parameter set-
up
selection lsb
14 Parameter set-
up
selection msb
15 No function Reverse
Explanation of the Control Bits
Bits 00/01 Reference value
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:
NB!
In par. 8-56
Preset reference select a selection is made to define how Bit 00/01 gates
with the corresponding function on the digital inputs.
Program-
med
ref. value
Parameter Bit 01 Bit 00
1 3-10 [0] 0 0
2 3-10 [1] 0 1
3 3-10 [2] 1 0
4 3-10 [3] 1 1
4. How to Control the Frequency Converter VLT
®
Profibus
36 MG.33.C4.02 - VLT
®
is a registered Danfoss trademark
4