Troubleshooting - Honeywell 3G SmartVFD HVFD3D3A0015 Installation And User Manual

7.5 Troubleshooting

Table 7.5. Troubleshooting.
Symptom
Display dark/
No function
Intermittent
display
74
Possible cause
Missing input power
Missing or open fuses or
circuit breaker tripped
No power to the LCP
Shortcut on control
voltage (terminal 12 or
50) or at control terminals
Incompatible LCP
Wrong contrast setting
Display (LCP) is defective
Internal voltage supply
fault or SMPS is defective
Overloaded power supply
(SMPS) due to improper
control wiring or a fault
within the adjustable
frequency drive
Test
See Table 4.4
See open fuses and
tripped circuit breaker in
this table for possible
causes.
Check the LCP cable for
proper connection or
damage.
Check the 24 V control
voltage supply for
terminals 12/13 to 20-39
or 10 V supply for
terminals 50 to 55.
Test using a different
LCP.
To rule out a problem in
the control wiring,
disconnect all control
wiring by removing the
terminal blocks.
Solution
Check the input power
source.
Follow the
recommendations
provided.
Replace the faulty LCP or
connection cable.
Wire the terminals
properly.
Use only LCP 101 or LCP
102.
Press [Status] + []/[]
to adjust the contrast.
Replace the faulty LCP or
connection cable.
Contact supplier.
If the display stays lit,
then the problem is in the
control wiring. Check the
wiring for short circuits or
incorrect connections. If
the display continues to
cut out, follow the
procedure for display
dark.
31-00559-01