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

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22 HMI Bypass Controller Installation and Commissioning Guide
If all above checks are good, attempt to reset the overload relay using the
overload reset button.
• Fire Alarm : A 24V input signal on Fire Alarm input (24) is present.
Recommended action:
»
If an external fire alarm is not present, verify customer terminal block
wiring.
• Damper Timeout : A 24V input signal on Damper Feedback (23) is present,
Damper Fault Response is “ENABLED,” and Damper Timeout has expired.
Recommended action:
»
Check operation of the customer damper and verify customer terminal
block wiring.
• Safety Input : A 24V input signal on Safety input (203) is present
Recommended action:
»
If an external Safety input is not present, verify customer terminal block
wiring.
• Watchdog : External VFD trip due to loss of communication between VFD
and HMI.
Recommended action:
»
Verify physical Ethernet connection between VFD and LCD touchscreen
HMI. Verify IP address of LCD touchscreen HMI and VFD are on the
same network.
Notes : If the fault cannot be cleared from the LCD touch screen HMI with a
reset it may be required to access the HVAC Drive H300 VFD directly with a
keypad or through Connect VFD configuration software.
For a full explanation of VFD faults, refer to the HVAC Drive H300 VFD User
Guide.
3.1.3.4 Graphical Trend Viewer
Historical view of Motor RPM, Motor Load (0-100%), and Motor Thermal
Overload (0-100%) going back 8 minutes. Use the left and right arrows to
navigate between the graphs.