4.4 Danfoss FC Control Profile
Illustration 4.2 8-10 Control Word Profile=Frequency Converter
profile
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 4.7 Control Word Bits
Explanation of control bits
Bits 00/01
Bits 00 and 01 are used to choose between the four
reference values, which are pre-programmed in 3-10 Preset
Reference according to Table 4.8.
Programmed
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
Table 4.8 Reference Values
NOTICE
In 8-56 Preset Reference Select select a selection is made 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. Braking current
and duration are set in 2-01 DC Brake Current and 2-02 DC
Braking Time. Bit 02=‘1’ leads to ramping, 3-41 Ramp 1
Ramp Up Time
Bit 03, Coasting
Bit 03=‘0’ causes the frequency converter to immediately
release the motor (the output transistors are "shut off"), so
that it coasts 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 stop, in which the motor speed is
ramped 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 then be changed
only with the digital inputs (5-10 Terminal 18 Digital Input
to 5-15 Terminal 33 Digital Input) programmed to Speed up
and Speed down.
NOTICE
If Freeze output is active, the frequency converter can only
be stopped by the following:
•
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 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’ no reset.
Bit 07=‘1’ resets a trip. Reset is activated on the leading
edge of the signal, that is, when changing from logic ‘0’ to
logic ‘1’.
Bit 08, Jog
Bit 08=‘1’ causes the output frequency to be determined
by 3-19 Jog Speed [RPM].
How to Control MCA 122 Modbus TCP
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