Operating instructions

VLT
®
2800, VLT
®
6000 HVAC and VLT
®
8000 AQUA Modbus RTU
■ Process Data
Process Data is illustrated as coils in Modbus RTU.
■ Status Coil Maps
(128 coils total)
Note: The coil number shown in the following table
must be transmitted as ("shown value-1") in MODBUS
telegrams (e.g. Coil number 0:00001 is transmitted
as address 0000 in the MODBUS telegram).
Coil
Number
Description
1-16 PCD
1
Control Word (master → slave)
17-32 PCD
2
Reference Value (master →
slave)
33-48 PCD
1
Status Word (slave → master)
49-64 PCD
2
Given output frequency (slave
→ master)
65 Write parameters to eeprom (1 = true
/0=false)
66-128 Reserved
■ Control Word Bit Descriptions for VLT 2800
The control word is used to send commands from a
master (e.g. a PC) to a slave (frequency converter).
Bit Bit = 0 Bit =1
00 Preset ref. lsb
01 Preset ref. msb
02 DC braking
03 Coasting stop
04 Quick stop
05 Freeze outp. freq.
06 Ramp stop Start
07 Reset
08 Jog
09 Ramp 1 Ramp 2
10 Data not valid Data valid
11 No function Relay 01 activated
12 No function Digital output
Termina l 46
activated
13 Select Setup, lsb
14 Select Setup, msb
15 Reversing
Bit 00/01:
Bit 00/01 is used to select between the two
pre-programmed references (parameters 215-218
Preset reference) according to the following table:
Preset ref. Parameter Bit 01 Bit 00
1 215 0 0
2 216 0 1
3 217 1 0
4 218 1 1
NB!:
In parameter 508 Selection of preset
reference a selection is made to define how
Bit 00/01 gates with the corresponding
function on the digital inputs.
B
it 02, DC brake:
Bit 02 = ’0’ causes DC braking and stop. Brake
voltage and duration are preset in parameters
132 DC brake voltage and parameter 126 DC
braking time. Note: In parameter 504 DC brake a
selection is made to define how Bit 02 gates with the
corresponding function on a digital input.
B
it 03, Coasting stop:
Bit 03 = ’0’ causes the frequency converter to
immediately "let go" of the motor (the output transistors
are "shut off"), so that it coasts to a standstill.
Bit 03 = ’1’ causes the frequency converter to be able
start the motor if the other starting conditions have
been fulfilled. Note: In parameter 502 Coasting stop
a selection is made to define how Bit 03 gates with
the corresponding function on a digital input.
MG.10.S2.02 - VLT is a registered Danfoss trademark
20