VLT
®
FCD Series
■
Control Word according toFC protocol
To select
FC protocol
in the control word, parameter
512
Telegram Profile
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
12
No function
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 refer-
ence
a selection is made to define how Bit 00/
01 gates with the corresponding function on the digi-
tal inputs.
Bit 02, DC brake:
Bit 02 = ’0’ causes DC braking and stop. Brake volt-
age and duration are preset in parameters 132
DC
brake voltage
and parameter 126
DC braking time
.
Note: In parameter 504
DC brake
a selection is
made to define how Bit 02 gates with the corre-
sponding function on a digital input.
Bit 03, Coasting stop:
Bit 03 = ’0’ causes the frequency converter to imme-
diately "let go" of 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. 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
.
Bit 05, Freeze output frequency:
Bit 05 = ’0’ causes the present output frequency (in
Hz) to freeze. The frozen output frequency can now
only be changed by means of the digital inputs pro-
grammed to
Speed up
and
Speed down
.
NB!:
If
Freeze output
is active, the frequency con-
verter cannot be stopped via Bit 06
Start
or
via a digital input. The frequency converter can only
be stopped by the following:
•
Bit 03 Coasting stop
•
Bit 02 DC braking
•
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’s
speed is ramped down to stop via the selected
ramp
down
parameter.
Bit 06 = ’1’ causes the frequency converter to be
able to start the motor, if the other starting condi-
tions have been fulfilled. Note: In parameter 505
Start
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 acti-
vated on the signal’s leading edge, i.e. when
changing from logic ’0’ to logic ’1’.
Bit 08, Jog:
Bit 08 = ’1’ causes the output frequency to be deter-
mined by parameter 213
Jog frequency
.
Bit 09, Selection of ramp 1/2:
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