Fc Drive Control Profile - Danfoss VLT AQUA Drive FC 202 Design Manual

System Integration
3.8.11.2 Storage of Data
The coil 65 decimal determines whether data written to
the adjustable frequency drive is stored in EEPROM and
3 3
RAM (coil 65=1) or only in RAM (coil 65=0).
3.8.11.3 IND (Index)
Some parameters in the adjustable frequency drive are
array parameters, for example, 3-10 Preset Reference. Since
the Modbus does not support arrays in the holding
registers, the adjustable frequency drive has reserved the
holding register 9 as pointer to the array. Before reading or
writing an array parameter, set the holding register 9.
Setting the holding register to the value of 2 causes all
following read/write to array parameters to be to the index
2.
3.8.11.4 Text Blocks
Parameters stored as text strings are accessed in the same
way as the other parameters. The maximum text block size
is 20 characters. If a read request for a parameter is for
more characters than the parameter stores, the response is
truncated. If the read request for a parameter is for fewer
characters than the parameter stores, the response is
padded with spaces.
3.8.11.5 Conversion Factor
Since a parameter value can only be transferred as a whole
number, a conversion factor must be used to transfer
decimals.
3.8.11.6 Parameter Values
Standard data types
Standard data types are int 16, int 32, uint 8, uint 16 and
uint 32. They are stored as 4x registers (40001–4FFFF). The
parameters are read using function 03 hex Read Holding
Registers. Parameters are written using the function 6 hex
Preset Single Register for 1 register (16 bits), and the
function 10 hex Preset Multiple Registers for two registers
(32 bits). Readable sizes range from one register (16 bits)
up to ten registers (20 characters).
Non-standard data types
Non-standard data types are text strings and are stored as
4x registers (40001–4FFFF). The parameters are read using
function 03 hex Read Holding Registers and written using
function 10 hex Preset Multiple Registers. Readable sizes
range from one register (two characters) up to ten registers
(20 characters).
92
®
VLT AQUA Drive FC 202

3.8.12 FC Drive Control Profile

3.8.12.1 Control Word According to FC
Bit
no.:
Figure 3.56 Control Word
Bit
00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
Table 3.43 Control Word Bits
Explanation of the Control Bits
Bits 00/01
Bits 00 and 01 are used to select between the four
reference values, which are pre-programmed in 3-10 Preset
Reference according to Table 3.44.
Programmed ref.
value
1
2
3
4
Table 3.44 Reference Values
Danfoss A/S © 09/2014 All rights reserved.
Profile (8-10 Control Profile=FC
profile)
Master-follower
CTW
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Bit value=0 Bit value=1
Reference value External selection lsb
Reference value External selection msb
DC brake Ramp
Coasting No coasting
Quick stop Ramp
Hold output frequency Use ramp
Ramp stop Start
No function Reset
No function Jog
Ramp 1 Ramp 2
Data invalid Data valid
No function Relay 01 active
No function Relay 02 active
Parameter set-up Selection lsb
Parameter set-up Selection msb
No function Reverse
Parameter Bit 01
3-10 Preset 0
Reference [0]
3-10 Preset 0
Reference [1]
3-10 Preset 1
Reference [2]
3-10 Preset 1
Reference [3]
Speed ref.
Bit 00
0
1
0
1
MG20N622