Bus Speed Reference Value; Control Word According To Profidrive Profile (Ctw) - Danfoss VLT AutomationDrive FC 301 Design Manual

RS-485 Installation and Set...
All bits in the STW are set to '0' if the connection between
the Interbus option and the frequency converter is lost, or
an internal communication problem has occurred.

12.13.3 Bus Speed Reference Value

Speed reference value is transmitted to the frequency
converter in a relative value in %. The value is transmitted
in the form of a 16-bit word; in integers (0-32767) the
value 16384 (4000 hex) corresponds to 100%. Negative
figures are formatted by means of 2's complement. The
actual output frequency (MAV) is scaled in the same way
as the bus reference.
Master-follower
CTW
Follower-master
STW
Illustration 12.18 Actual Output Frequency (MAV)
The reference and MAV are scaled as follows:
Par.3-00 set to
(1) -max- +max
Max reference
12 12
Par.3-00 set to
(0) min-max
Illustration 12.19 Reference and MAV
190
16bit
Speed ref.
Actual output
freq.
-100% 0%
(C000hex) (0hex)
Reverse
Par.3-03 0
0%
(0hex)
Par.3-02
Min reference
®
VLT AutomationDrive FC 301/FC 302 Design Guide, 0.25-75 kW
12.13.4 Control Word according to
The control word is used to send commands from a master
(for example, a PC) to a follower.
Bit
00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
Table 12.24 Control Word Bits
Explanation of the control bits
100%
(4000hex)
Bit 00, OFF 1/ON 1
Forward
Normal ramp stops using the ramp times of the actual
Par.3-03 selected ramp.
Max reference
Bit 00="0" leads to the stop and activation of the output
relay 1 or 2 if the output frequency is 0 Hz and if [Relay
100%
(4000hex) 123] has been selected in 5-40 Function Relay.
When bit 0="1", the frequency converter is in State 1:
Forward
"Switching on inhibited".
Par.3-03
Bit 01, OFF 2/ON 2
Max reference
Coasting stop
When bit 01="0", a coasting stop and activation of the
output relay 1 or 2 occurs if the output frequency is 0 Hz
and if [Relay 123] has been selected in 5-40 Function Relay.
Bit 02, OFF 3/ON 3
Quick stop using the ramp time of 3-81 Quick Stop Ramp
Time. When bit 02="0", a quick stop and activation of the
output relay 1 or 2 occurs if the output frequency is 0 Hz
and if [Relay 123] has been selected in 5-40 Function Relay.
When bit 02="1", the frequency converter is in State 1:
"Switching on inhibited".
Bit 03, Coasting/No coasting
Coasting stop Bit 03="0" leads to a stop.
When bit 03="1", the frequency converter can start if the
other start conditions are satisfied.
MG33BF02 - Rev. 2013-12-20
PROFIdrive Profile (CTW)
Bit=0 Bit=1
OFF 1 ON 1
OFF 2 ON 2
OFF 3 ON 3
Coasting No coasting
Quick stop Ramp
Hold frequency output Use ramp
Ramp stop Start
No function Reset
Jog 1 OFF Jog 1 ON
Jog 2 OFF Jog 2 ON
Data invalid Data valid
No function Slow down
No function Catch up
Parameter set-up Selection lsb
Parameter set-up Selection msb
No function Reverse