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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 7.33
7.9 FC
Control
Profile
7.9.1 Control Word According to FC Profile
(
8-10 Control Profile
= FC profile)
Illustration 7.16
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 7.34
Explanation of the Control Bits
Bits 00/01
Bits 00 and 01 are used to choose between the four
reference values, which are pre-programmed in
3-10 Preset
Reference
according to the following table:
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 7.35
NOTE
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 by means of the
digital inputs (
5-10 Terminal 18 Digital Input
to
5-15 Terminal 33 Digital Input
) programmed to
Speed up
and
Slow down
.
RS-485 Installation and Set...
VLT
®
Refrigeration Drive Design Guide
MG16G102 - VLT
®
is a registered Danfoss trademark
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