6.5 Danfoss FC Control Profile
6.5.1 Control Word according to FC Profile
(CTW)
To select Danfoss FC protocol in the control word,
8-10 Control Word Profile
must be set to
[0] FC
##
profile
.
The control word is used to send commands from a master
(PLC or PC) to a slave (frequency converter).
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
Table 6.9
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
3-10 Preset
Reference
according to
.
NOTE
In
8-56 Preset Reference Select
a selection is made to define
how Bit 00/01 gates with the corresponding function on
the digital inputs.
Bit 01
Bit 00
Programmed
ref. value
Parameter
0
0
1
[0]
3-10 Preset Reference
0
1
2
[1]
3-10 Preset Reference
1
0
3
[2]
3-10 Preset Reference
1
1
4
[3]
3-10 Preset Reference
Table 6.10
Bit 02, DC brake
Bit 02=“0” - leads to DC braking and stop. Braking current
and duration are set in
2-01 DC Brake Current
and
2-02 DC
Braking Time
.
Bit 02=“1” - leads to ramping.
Bit 03, Coasting
Bit 03=“0” - causes the frequency converter to immediately
coast the motor to a standstill.
Bit 03=“1” - enables the frequency converter to start the
motor if the other starting conditions have been fulfilled.
NOTE
In
8-50 Coasting Select
a selection is made to define how
Bit 03 gates with the corresponding function on a digital
input.
Bit 04, Quick stop
Bit 04=“0” - causes a quick stop, ramping the motor speed
down to stop via
3-81 Quick Stop Ramp Time
.
Bit 04=“1” - the frequency converter ramps the motor
speed down to stop via
3-81 Quick Stop Ramp Time
.
Bit 05, Hold output frequency
Bit 05=“0” - causes the present output frequency (in Hz) to
freeze. The frozen output frequency can only be changed
with the digital inputs (
5-10 Terminal 18 Digital Input
to
5-15 Terminal 33 Digital Input
) programmed to
Speed up
and
Speed down
.
Bit 05=“1” - use ramp.
NOTE
If
Freeze output
is active, stop the frequency converter with
•
Bit 03 Coasting stop
•
Bit 02 DC braking
•
Digital input (
5-10 Terminal 18 Digital Input
to
5-15 Terminal 33 Digital Input
) programmed to
DC
braking
,
Coasting stop
, or
Reset and coasting stop
.
Bit 06, Ramp stop/start
Bit 06=“0” - causes a stop, in which the motor speed is
ramped 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 have been fulfilled.
NOTE
In
8-53 Start Select
a selection is made to define how Bit 06
Ramp stop/start gates with the corresponding function on
a digital input.
How to Control the Frequenc...
MCA 124 EtherCAT Operating Instruction
22
MG92A302 - VLT
®
is a registered Danfoss trademark
6
6