FC 300 Profibus
How to Control the FC 300
Danfoss FC Control Profile
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
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
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.
Pro-
grammed
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
Bit 02, DC brake
Bit 02 = “0” leads to DC braking and stop. Braking current and duration are set in par. 2-01
DC Brake current
and 2-02
DC Braking time
. Bit 02 = “1” leads to ramping.
35
MG.33.C2.02 - VLT is a registered Danfoss trademark
