Bus Speed Reference Value - GE AF-650 GP Design And Installation Manual

RS485 Installation and Set-...
All bits in the STW are set to 0 if the connection between
the InterBus option and the frequency converter is lost, or
an internal communication problem has occurred.

9.3.3 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.
Illustration 9.4 Actual Output Frequency (MAV)
The reference and MAV are scaled as follows:
Illustration 9.5 Reference and MAV
MG35M402
AF-650 GP™ Design and Installation Guide
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