Danfoss VLT Decentral FCD 300, Design Manual

Page: 104 / 156

Conversion table
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 two blocks of 16 bits, which
always occur in the defined sequence.
PCD 1 PCD 2
Control telegram
(master
⇒
slave)
Control word Reference-
value
Control telegram
(slave ⇒ master)
Status word Present outp.
frequency
4.7.6 Control Word According to FC Protocol
To select FC protocol in the control word, parameter 512 Telegram Pro-
file must be set to FC protocol [1].
The control word is used to send commands from a master (e.g. a PC) to
a slave (frequency converter).
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 output
12 No function Digital output
13 Select Setup, lsb
14 Select Setup, msb
15 Reversing
Bit 00/01:
Bit 00/01 is used to select between the two pre-programmed references
(parameters 215-218
Preset reference
) according to the following table:
Preset ref. Parameter Bit 01 Bit 00
1 215 0 0
2 216 0 1
3 217 1 0
4 218 1 1
NB!
In parameter 508
Selection of preset reference
a se-
lection 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 parameter 126 DC brak-
ing time . Note: In parameter 504 DC brake a selection is made to define
how Bit 02 gates with the corresponding function on a digital input.
Bit 03, Coasting stop:
Bit 03 = '0' causes the frequency converter to immediately "let go" of the
motor (the output transistors are "shut off"), so that it coasts to a stand-
still.
Bit 03 = '1' causes the frequency converter to be able start the motor if
the other starting conditions have been fulfilled. Note: In parameter 502
Coasting stop
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's speed is ramped down to
stop via parameter 212
Quick stop ramp-down time
.
VLT
®
Decentral FCD 300 Design Guide 4 Programming
MG.90.S1.02 - VLT ® is a registered Danfoss trademark
103
4