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

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32 HMI Bypass Controller Installation and Commissioning Guide
3.2.12 Alarm Response - Fireman’s Override
This Alarm Response screen allows for the configuration of the Fireman’s
Override feature.
Fireman’s Override : When enabled, a fireman override command will ignore
“Motor Overload” and “Damper Timeout” faults. The system will still wait for
a damper feedback, but if no feedback is detected and a timeout is triggered,
the system will bypass anyway. The system will run to destruction as long as
the override command and safety input (terminal 203) are present.
Note: When disabled, “Motor Overload” and “Damper Timeout” will stop the
motor.
Firemans’s Override (VFD mode): If ON, a Fireman’s Override command will
initiate VFD operatin rater than turning the bypass contactor on.
VFD Override Setpoint : Determines the frequency reference used by the VFD
when in override mode.
Fireman’s Override PID Control: Allows PID control loop to regulate frequency
reference in override mode (ignores VFD Setpoint frequency).
Note: Fireman’s Override (VFD mode) must be ON for Fireman’s Override PID
Control to function (requires analog input to terminal 6 of VFD).
3.2.13 Advanced I/O Settings
The Advanced, I/O Settings screen, allows the setup of the I/O settings needed
for the onboard PID feature
Analog PID Feedback Mode : Defines the input mode for analog input 2 (PID
feedback input) VFD terminal 6.
Sensor Range : Defines the operating range of the feedback sensor. This
information can be found in the documentation provided with your sensor.