5-65
H28 Droop Control
In a system in which two or more motors drive single machinery, any speed gap between
inverter-driven motors results in some load unbalance between motors. The droop control
allows each inverter to drive the motor with the speed droop characteristics for increasing its
load, eliminating such kind of load unbalance.
To use droop control, be sure to auto-tune the inverter for the motor.
H30
y98
Communications Link Function (Mode selection)
Bus Link Function (Mode selection)
Using the RS-485 communications link (standard/option) or field bus (option) allows you to
issue frequency commands and run commands from a computer or PLC at a remote location,
as well as monitoring the inverter running information and the function code data.
H30 and y98 specify the sources of those commands--"inverter itself" and "computers or
PLCs via the RS-485 communications link or field bus." H30 is for the RS-485
communications link; y98 for the field bus.
Command sources selectable
Command sources Description
Inverter itself Sources except RS-485 communications link and field bus
Frequency command source: Specified by F01/C30, or
multi-frequency command
Run command source: Via the keypad or digital input
terminals selected by F02
Via RS-485 communications link
(standard)
Via the standard RJ-45 port used for connecting keypad
Via RS-485 communications link
(option card)
Via RS-485 communications link (option card)
Via field bus (option) Via field bus (option) using FA protocol such as DeviceNet or
PROFIBUS-DP
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