Bus Speed Reference Value - Danfoss VLT HVAC Basic Drive FC 101 Design Manual

RS485 Installation and Set-...
Bit 08, Speed ≠ reference/speed = reference
Bit 08 = 0: The motor runs, but the present speed is
different from the preset speed reference. It might happen
when the speed ramps up/down during start/stop.
Bit 08 = 1: The motor speed matches the preset speed
reference.
Bit 09, Local operation/bus control
Bit 09 = 0: [Off/Reset] is activated on the control unit or [2]
Local in parameter 3-13 Reference Site is selected. It is not
possible to control the frequency converter via serial
communication.
Bit 09 = 1: It is possible to control the frequency converter
via the fieldbus/serial communication.
Bit 10, Out of frequency limit
Bit 10 = 0: The output frequency has reached the value in
parameter 4-12 Motor Speed Low Limit [Hz] or
parameter 4-14 Motor Speed High Limit [Hz].
7 7
Bit 10 = 1: The output frequency is within the defined
limits.
Bit 11, No operation/in operation
Bit 11 = 0: The motor is not running.
Bit 11 = 1: The frequency converter has a start signal
without coast.
Bit 12, Frequency converter OK/stopped, auto start
Bit 12 = 0: There is no temporary overtemperature on the
frequency converter.
Bit 12 = 1: The frequency converter stops because of
overtemperature but the unit does not trip and resumes
operation once the overtemperature normalizes.
Bit 13, Voltage OK/limit exceeded
Bit 13 = 0: There are no voltage warnings.
Bit 13 = 1: The DC voltage in the frequency converter's DC
link is too low or too high.
Bit 14, Current OK/limit exceeded
Bit 14 = 0: The motor current is lower than the current
limit selected in parameter 4-18 Current Limit.
Bit 14 = 1: The current limit in parameter 4-18 Current Limit
is exceeded.
Bit 15, Thermal level OK/limit exceeded
Bit 15 = 0: The timers for motor thermal protection and
thermal protection are not exceeded 100%.
Bit 15 = 1: 1 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. The integer value 16384
(4000 hex) corresponds to 100%. Negative figures are
formatted using 2's complement. The actual output
frequency (MAV) is scaled in the same way as the bus
reference.
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®
VLT HVAC Basic Drive FC 101
Master-slave
Follower-slave
Illustration 7.17 Actual Output Frequency (MAV)
Danfoss A/S © 04/2016 All rights reserved.
16bit
CTW Speed reference
Actual output
STW
frequency
MG18C702