Franklin Electric MonoDrive - Symptom Based Troubleshooting

MAINTENANCE
Troubleshooting
47
Symptom Based Troubleshooting
Condition Display Possible Cause Corrective Action
No Water
None
• No supply voltage
present
• Display board cable
disconnected or loose
• Verify cable connection between main control board and
display board
• If correct voltage is present, replace drive
Green
“---”
• Pressure sensor circuit
• Verify water pressure is below system set point
• If Pressure Input Board break-away tab is removed,
ensure auxiliary device is connected and closed circuit
• Jumper wires together at pressure sensor; if pump starts,
replace sensor
• If pump doesn’t start, check sensor connection at
Pressure Input Board; if loose, repair
• If pump doesn’t start, jumper sensor connection at
Pressure Input Board. If pump starts, replace wire
• If pump doesn’t start with sensor Pressure Input Board
connection jumpered, replace Pressure Input Board
• If pump doesn’t start with new Pressure Input Board,
replace drive
Red
Fault Code
• Fault detected
• Refer to
“Diagnostic Fault Codes” on page 43.
Green
Motor Frequency
• Drive and motor are
operating
• Loose switch or cable
connection
• Incorrect motor or pump
settings
• Motor may be running
backwards
• Gulping water at pump
inlet
• Verify Maximum Frequency setting. If this setting was
reduced below maximum value, increase
• Verify motor/pump ratings and match to motor/pump
settings on drive (DIP switch or Wi-Fi)
• Verify motor connections
• Frequency max, amps low, check for closed valve, or
stuck check valve
• Frequency max, amps high, check for hole in pipe
• Frequency max, amps erratic, check pump operation,
dragging impellers
• This is not a drive problem
• Check all connections
• Disconnect power, allow well to recover and retry
Pressure Fluctua-
tions (Poor Regu-
lation
Green
Motor Frequency
• Pressure sensor
placement and setting
• Pressure gauge
placement
• Pressure tank size and
pre-charge
• Leak in system
• Air in pump intake (lack
of submergence)
• System response setting
• Correct pressure sensor placement and settings
• Tank may be too small for system flow
• This is not a drive problem
• Disconnect power and check pressure gauge for drop
• Set deeper in the well or tank; install a flow sleeve with
airtight seal around drop pipe and cable
• If fluctuation is only on branches before sensor, enable
Steady Flow
• Change tank size configuration
• Reduce frequency output range
• Adjust System Response value