Bus Speed Reference Value - Danfoss FC 101 Design Manual

RS-485 Installation and Set...
Bit 15, Timer OK/limit exceeded
Bit 15='0': The timers for motor thermal protection and
thermal protection are not exceeded 100%.
Bit 15='1': One of the timers exceeds 100%.

7.11.3 Bus Speed Reference Value

Speed reference value is transmitted to the frequency
converter in a relative value in %. The value is transmitted
in the form of a 16-bit word; in integers (0-32767) the
value 16384 (4000 Hex) corresponds to 100%. Negative
figures are formatted by means of 2's complement. The
Actual Output frequency (MAV) is scaled in the same way
as the bus reference.
Master-follower
CTW Speed ref.
Follower-master
Actual output
STW
freq.
Illustration 7.15 Actual Output Frequency (MAV)
The reference and MAV are scaled as follows:
-100%
(C000hex)
Par.3-00 set to
Reverse
(1) -max- +max
Par.3-03
Max reference
Par.3-00 set to
(0) min-max
Illustration 7.16 Reference and MAV
®
VLT HVAC Basic Drive FC 101 Design Guide
16bit
0% 100%
(0hex) (4000hex)
Forward
0 Par.3-03
Max reference
0% 100%
(0hex) (4000hex)
Forward
Par.3-02 Par.3-03
Max reference
Min reference
MG18C502 - Rev. 2013-09-06
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