Conversion
index
Conversion
factor
73 0.1
2 100
1 10
0 1
-1 0.1
-2 0.01
-3 0.001
-4 0.0001
-5 0.00001
4.7.5 Process Words
The block of process words is divided into 2 blocks of 16
bits, which always occur in the defined sequence.
Illustration 4.28 Block of Process Words
PCD 1 PCD 2
Control telegram
(master⇒slave)
Control word Reference-value
Control telegram
(slave⇒master)
Status word Present output
frequency
Table 4.10 Function of PCD 1 and PCD 2
4.7.6
Control Word According to FC
Protocol
To select FC protocol in the control word, set parameter
512 Telegram Profile to [1] FC protocol.
The control word is used to send commands from a master
(e.g. a PC) to a slave (frequency converter).
Illustration 4.29 Control Word According to FC Protocol
Bit Bit=0 Bit=1
00 Preset ref. lsb
01 Preset ref. msb
02 DC braking
03 Coasting stop
04 Quick stop
05 Freeze outp. freq.
06 Ramp stop Start
07 Reset
08 Jog
09 Ramp 1 Ramp 2
10 Data not valid Data valid
11 No function Relay 01 activated
12 No function Digital output Terminal 46
activated
13 Select Setup, lsb
14 Select Setup, msb
15 Reversing
Table 4.11 Bit Definition
Bit 00/01
Bit 00/01 is used to select between the 4 pre-programmed
references (parameters 215-218 Preset reference) according
to Table 4.12.
Preset ref. Parameter Bit 01 Bit 00
1 215 0 0
2 216 0 1
3 217 1 0
4 218 1 1
Table 4.12 Bit 00/01
NOTICE
In parameter 508 Selection of preset reference, 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' causes DC braking and stop. Brake voltage and
duration are preset in parameters 132 DC brake voltage and
126 DC braking time.
NOTICE
In parameter 504 DC brake, a selection is made to define
how bit 02 gates with the corresponding function on a
digital inpu
Bit 03, Coasting stop
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' causes the frequency converter to be able start
the motor if the other starting conditions have been
fulfilled.
Programming
Design Guide
110 Danfoss A/S © Rev. May/2014 All rights reserved. MG27E402
44
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