Response
The normal response returns the slave address, function
code, starting address, and quantity of registers preset.
Field Name
Example (HEX)
Slave Address
01
Function
10
Starting Address HI
04
Starting Address LO
D7
No. of Registers HI
00
No. of registers LO
02
Error Check (CRC)
-
Table 8.32 Response
8.11 Danfoss FC Control Profile
8.11.1 Control Word According to FC
Profile (
8-10 Control Profile
= FC
profile)
Speed ref.
CTW
Master-follower
130BA274.11
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Bit
no.:
Illustration 8.16 Control Word
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 02 active
13
Parameter set-up
Selection lsb
14
Parameter set-up
Selection msb
15
No function
Reverse
Table 8.33 Control Word Bits
Explanation of the Control Bits
Bits 00/01
Bits 00 and 01 are used to select between the 4 reference
values, which are pre-programmed in
3-10 Preset Reference
according to
.
Programmed ref.
value
Parameter
Bit 01
Bit 00
1
3-10 Preset
Reference
[0]
0
0
2
3-10 Preset
Reference
[1]
0
1
3
3-10 Preset
Reference
[2]
1
0
4
3-10 Preset
Reference
[3]
1
1
Table 8.34 Reference Values
NOTICE
Make a selection in
8-56 Preset Reference Select
to define
how Bit 00/01 gates with the corresponding function on
the digital inputs.
Bit 02, DC brake
Bit 02 = ’0’ leads to DC braking and stop. Set braking
current and duration in
2-01 DC Brake Current
and
2-02 DC
Braking Time
. Bit 02 = ’1’ leads to ramping.
Bit 03, Coasting
Bit 03 = ’0’: The frequency converter immediately "lets go"
of the motor, (the output transistors are "shut off") and it
coasts to a standstill. Bit 03 = ’1’: The frequency converter
starts the motor, if the other starting conditions are met.
Make a selection in
8-50 Coasting Select
to define how Bit
03 gates with the corresponding function on a digital
input.
Bit 04, Quick stop
Bit 04 = ’0’: Makes the motor speed ramp down to stop
(set in
3-81 Quick Stop Ramp Time
).
Bit 05, Hold output frequency
Bit 05 = ’0’: The present output frequency (in Hz) freezes.
Change the frozen output frequency only with the digital
inputs (
5-10 Terminal 18 Digital Input
to
5-15 Terminal 33
Digital Input
) programmed to
Speed up
and
Slow down
.
NOTICE
If Freeze output is active, the frequency converter can
only be stopped by the following:
•
Bit 03 Coasting stop
•
Bit 02 DC braking
•
Digital input (
5-10 Terminal 18 Digital Input
to
5-15 Terminal 33 Digital Input
) programmed to
DC braking
,
Coasting stop
, or
Reset
and
coasting
stop
.
Bit 06, Ramp stop/start
Bit 06 = ’0’: Causes a stop and makes the motor speed
ramp down to stop via the selected ramp down parameter.
Bit 06 = ’1’: Permits the frequency converter to start the
motor, if the other starting conditions are met.
Installation and Set-up
Design Guide
144
Danfoss A/S © Rev. 06/2014 All rights reserved.
MG11BC02
8
8
