Nidec Control Techniques HVAC Drive H300 HMI Bypass, Installation And Commissioning Manual

Page: 41 / 56

HMI Bypass Controller Installation and Commissioning Guide 41
If the application requires the HMI Bypass to disable in the case of loss of
Damper Feedback input (terminal 23) and enable the Damper Timeout trip,
then the Damper Fault Response should be set to “ENABLED.” If enabled,
set Damper Timeout for the time between loss of Damper Feedback input
(terminal 23) and when the HMI Bypass initiates a Damper Timeout trip.
Once complete press the “MORE” icon.
Step 8 - Alarm Response - Fireman’s Override :
Set Fireman’s Override (VFD mode) to “ON” if you require the VFD to run at
a fixed frequency when the Fireman’s Override is ENABLED. The fixed speed
setting is adjusted in the SETPOINT window. Setting to “OFF” will result in the
system running in Bypass Mode when the Fireman’s Override is ENABLED
Note: To adjust the setpoint Fireman’s Override (VFD mode) must be “ON.”
Once set, return Fireman’s Override (VFD mode) to “OFF” for normal HMI
Bypass operation.
Set Fireman’s Override PID Control to “ON” if you require the VFD to run
from PID control frequency reference.
Note: This feature requires the PID controller to be setup and ignores VFD
Setpoint frequency.
Once complete press the “NEXT” icon.
Step 9 - PID Controller : The Setup Wizard will prompt the question, “Are you
using the onboard PID controller?”