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]
00
2 3-10 Preset
Reference [1]
01
3 3-10 Preset
Reference [2]
10
4 3-10 Preset
Reference [3]
11
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
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