FC101 Design Guide

Field name Example (hex)
Slave address 01
Function 17
Byte count 04
Read registers value HI 00
Read registers value LO 00
Read registers value HI C3
Read registers value LO 50
Error check (CRC) –
Table 7.35 Response
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.:
Figure 7.15 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 7.36 Control Word According to FC Prole
Explanation of the control bits
Bits 00/01
Bits 00 and 01 are used to select among the 4 reference
values, which are preprogrammed in parameter 3-10 Preset
Reference according to Table 7.37.
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 7.37 Control Bits
NOTICE!
In parameter 8-56 Preset Reference Select, 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 motor (the output transistors are shut
o), and it
coasts to a standstill.
Bit 03 = 1: If the other starting conditions are met, the
frequency converter starts the motor.
In parameter 8-50 Coasting Select, dene 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 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 programmed to [21] Speed up and [22] Speed down
(parameter 5-10 Terminal 18 Digital Input to
parameter 5-13 Terminal 29 Digital Input).
NOTICE!
If freeze output is active, the frequency converter can
only be stopped in 1 of the following ways:
•
Bit 03 coast stop.
•
Bit 02 DC brake.
•
Digital input programmed to [5] DC brake
inverse, [2] Coast inverse, or [3] Coast and reset
inv (parameter 5-10 Terminal 18 Digital Input to
parameter 5-13 Terminal 29 Digital Input).
RS485 Installation and Set-...
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HVAC Basic Drive FC 101
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