5.2.5 Influence of the Digital Input
Terminals upon FC Control Mode
The influence of the digital input terminals upon control of
the frequency converter can be programmed in
8-50 Coasting Select
to
8-56 Preset Reference Select
.
NOTE
Note the
8-01 Control Site
overrules the settings in
8-50 Coasting Select
to
8-56 Preset Reference Select
, and
terminal 37
Coasting Stop (safe)
overrules any parameter.
Each digital input signal can be programmed to logic AND,
logic OR, or to have no relation to the corresponding bit in
the control word. This way, fieldbus only, fieldbus AND
Digital Input, or Ether Fieldbus OR Digital input terminal
can initiate a specific control command, that is stop/coast.
CAUTION
To control the frequency converter via POWERLINK, set
8-50 Coasting Select
to either
[1] Bus
, or to
[2] Logic AND
.
Then set
8-01 Control Site
to
[0] Digital and ctrl.word
or
[2]
control word only
.
5.3 Control Profile
The frequency converter can be controlled according to
the DS 402 profile, or the Danfoss FC profile. Select the
desired control profile in
8-10 Control Word Profile
. The
choice of profile affects the control and status word only.
The change of
8-10 Control Word Profile
will first be
activated at the next power up.
The desired control profile can also be controlled by object
6060 Modes of operation and readout by object 6061
Modes of operation display. Value -1 indicates frequency
converter profile. Value 2 indicates DS 402 Velocity mode.
If the frequency converter is run in DS 402 profile, the DS
402 profile must be selected (for example, by
8-10 Control
Word Profile
or object 6060). The four process data Control
Word, Reference, Status Word and Main Actual Value will
the information in according the specification. Make sure
that the profile selected is also the profile used in the PLC.
5.4 Danfoss FC Control Profile
5.4.1 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] frequency
converter
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 5.5 Bit Values for FC Control Word
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
Table 5.6
.
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 5.6 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 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.
How to Control the Frequenc...
MCA 123 POWERLINK Operating Instructions
16
MG92C102 - VLT
®
is a registered Danfoss trademark
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