Danfoss VLT DeviceNet MCA 104, Programming Manual

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Illustration 4.6 Speed Reference Value
The bus speed reference has the following format:
Parameter 3-00 Reference Range = 0 [ref
MIN
to ref
MAX
] 0
(0000 hex) [RPM] to + 32767 (7FFF hex) [RPM]
Parameter 3-00 Reference Range = 1 [-ref
MAX
to +ref
MAX
]
-32767 (8001 hex ) to +32767 [RPM] (7FFF hex)
The actual reference [Ref. %] in the frequency converter
depends on the settings in the following parameters:
Parameter 1-23 Motor Frequency
Parameter 1-25 Motor Nominal Speed
Parameter 3-03 Maximum Reference
NOTICE
When the bus speed reference is negative, and the
control word contains a run reverse signal, the frequency
converter runs clockwise (- - is +).
Example:
Parameter 1-25 Motor Nominal Speed = 1420 RPM
Parameter 1-23 Motor Frequency = 50 Hz
Parameter 3-03 Maximum Reference = 1420 RPM
To run the motor at 25%, the reference transmitted must
be: (1420x0.25) = 355 = 16.3 hex
163 hex
⇒
25%
⇒
F
out
= 12.5 Hz
4.4.4 Actual Output Speed under Instances
20/70 and 21/71
Illustration 4.7 Actual Output Speed Value
The value of the actual speed of the motor, is transmitted
in the form of a 16-bit word.
The value is transmitted as a whole number (negative
figures are formed with 2's complement).
-32767 (8000 hex) [RPM] to +32767 [RPM] (7FFF hex) [RPM]
4.5 FC Control Profile
4.5.1 Control Word under Instances
100/150, 101/151, and 102/152
To select FC protocol in the control word, set
parameter 8-10 Control Word Profile to [0] FC profile . The
control word is used to send commands from a master
(PLC or PC) to a slave (frequency converter).
Illustration 4.8 Control Words in Instances 100, 101, and 102
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 04 active
13 Parameter set-up Selection lsb
14 Parameter set-up Selection msb
15 No function Reverse
Table 4.5 Bits in Instances 100, 101, and 102
Explanation of the control bits:
Bits 00/01
Bits 00 and 01: Select between the 4 reference values,
which are pre-programmed in
parameter 3-10 Preset
Reference according to Table 4.6 .
Programmed
reference
value Parameter Bit 01 Bit 00
1 3-10 [0] 0 0
2 3-10 [1] 0 1
3 3-10 [2] 1 0
4 3-10 [3] 1 1
Table 4.6 Reference Values
Control Programming Guide
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