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

Page: 45 / 56

HMI Bypass Controller Installation and Commissioning Guide 45
Section 5 - Troubleshooting
The HMI will annunciate VFD and system alarms and trips when supply and
control power is applied.
The chart below is intended to assist with troubleshooting a system when the
HMI is not illuminated or no fault is indicated.
Symptom Indications Corrective Actions
Power disconnect is
ON, the HMI display
does not illuminate
when the screen is
tapped HMI is OFF - Check power lights on 24 Vdc power supply
- If power lights on, check 24 Vdc connections
to HMI
- If no power lights, check the 24 Vdc power
supply and control transformer fusing and
connections
Motor does not
rotate when VFD
mode is selected and
HAND is pressed or
AUTO is pressed and
the Auto-Run input
is ON HMI Bypass
status
displays
"VFD FAULT
DETECTED" - Check Trip log in HMI (see Section 3.1.3.3 for
instructions)
- If no fault is indicated on the HMI connect to
the drive using a plug in keypad or Connect
software and record the trip code. Refer to
the drive manual for further assistance or
download the diagnostic APP from www.
controltechniques.us
VFD and
BYP are
not visible
and/or HMI
displayed
"Timeout" - Check that the optional VFD service switch
is ON
- Check the VFD input fusing
- Check Ethernet cable connection between
HMI and VFD SI-ETHERNET module
- Check HMI IP address is 192.168.0.2 (see
Section 3.3 for instructions)
- Check VFD SI-ETHERNET module connection
status lights (see Section 6.4 for instructions)
VFD and BYP
are green
and status
displays
"RUN" - Check mechanical motor to load couplings
are intact
- Ensure that motor connections are made
and no VFD to motor disconnects are open
- If VFD contactor is not closed check control
transformer and contactor coil
- Check I/O status screen Terminal 29 STO
status is “ON”
- If Terminal 29 STO status is “OFF,” check OC
[1-C11] auxiliary contactor and connections