4.5 Danfoss FC Control Profile
4.5.1 Control Word according to FC Profile
(CTW)
To select Danfoss FC protocol in the control word, set
parameter 8-10 Control Word Profile
to
[0] frequency
converter
profile
. Use the control word to send commands
from a master (PLC or PC) to a follower (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 4.8 Bit Values for FC Control Word
Explanation of the control bits
Bits 00/01 Reference value
Bits 00 and 01 are used to select between the 4 reference
values, which are pre-programmed in
3-10 Preset Reference
according to
NOTICE
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 4.9 Programmed Reference Values for Bits
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 immediately to
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.
NOTICE
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
3-42 Ramp 1 Ramp Down Time
or
3-52 Ramp 2 Ramp Down 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.
NOTICE
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.
NOTICE
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.
Bit 07, Reset
Bit 07="0" - does not cause a reset.
Bit 07="1" - causes the reset of a trip. Reset is activated on
the signal’s leading edge, that is, when changing from
logic "0" to logic "1".
Bit 08, Jog
Bit 08="0" - no function.
Control
Programming Guide
20
Danfoss A/S © Rev. 05/2014 All rights reserved.
MG37G102
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