Danfoss VLT Compressor Drive CDS 803 - Danfoss FC Control Profile; Control Word According to FC Profile (8-10 Protocol = FC Profile)

7.11 Danfoss FC Control Prole
7.11.1 Control Word According to FC Prole
(8-10 Protocol = FC prole)
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 7.14 Control Word According to FC Prole
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 Relay 01 open Relay 01 active
12 Relay 02 open Relay 02 active
13 Parameter set-up Selection lsb
15 No function Reverse
Table 7.34 Control Word According to FC Prole
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 parameter 3-10 Preset
Reference according to Table 7.35.
Programmed
reference
value
Parameter Bit
01
Bit
00
1 Parameter 3-10 Preset Reference [0] 0 0
2 Parameter 3-10 Preset Reference [1] 0 1
3 Parameter 3-10 Preset Reference [2] 1 0
4 Parameter 3-10 Preset Reference [3] 1 1
Table 7.35 Control Bits
NOTICE
Make a selection in parameter 8-56 Preset Reference Select
to dene 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 parameter 2-01 DC Brake Current and
parameter 2-02 DC Braking Time.
Bit 02=1 leads to ramping.
Bit 03, Coasting
Bit 03=0: The frequency converter immediately releases the
compressor, (the output transistors are shut o) and it
coasts to a standstill.
Bit 03=1: The frequency converter starts the compressor if
the other starting conditions are met.
Make a selection in parameter 8-50 Coasting Select to
dene how bit 03 gates with the corresponding function
on a digital input.
Bit 04, Quick stop
Bit 04=0: Makes the compressor speed ramp down to stop
(set in parameter 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 (parameter 5-10 Terminal 18 Digital Input to
parameter 5-13 Terminal 29 Digital Input) programmed to
Speed up=21 and Slow down=22.
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 (parameter 5-10 Terminal 18 Digital
Input to parameter 5-13 Terminal 29 Digital
Input) programmed to [5] DC braking, [2]
Coasting stop, or [3] Reset and coasting stop.
Bit 06, Ramp stop/start
Bit 06=0: Causes a stop and makes the compressor speed
ramp down to stop via the selected ramp down parameter.
Bit 06=1: Permits the frequency converter to start the
compressor, if the other starting conditions are met.
Make a selection in parameter 8-53 Start Select to dene
how bit 06 Ramp stop/start gates with the corresponding
function on a digital input.
Bit 07, Reset
Bit 07=0: No reset.
Bit 07=1: Resets a trip. Reset is activated on the signal’s
leading edge, that is, when changing from logic 0 to logic
1.
Bit 08, Jog
Bit 08=1: The output frequency is determined by
parameter 3-11 Jog Speed [Hz].
RS485 Installation and Set-... Design Guide
MG18N202 Danfoss A/S © 12/2015 All rights reserved. 65
7 7