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NO
FAULTS and
ALARMS
POSSIBLE CAUSE
SOLUTION
1
PANEL COULD
NOT BE STARTED
No 24 V DC signal on
EPLC-6 board terminal
number 1
• Check Manual-0-Automatic selector button.
• Check if there is any start signal from BMS or “Remote Start”
terminals are not short-circuited.
• Check if there is any signal on RL3 relay.
• Check cable connections.
2
NO WATER
No 24 V DC signal on
EPLC-6 board terminal
number 2
• Check if there is any water in the tank.
• Check if the floater working properly.
• Be sure there is signal on RL1 relay terminals.
• Check cable connections.
3
PHASE FAULT
No 24 V DC signal on
EPLC-6 board terminal
number 3
• Check mains supply and voltage for each phase-neutral.
• Check phase sequence.
• Check phase protection relay.
• Be sure there is signal on RL2 relay terminals.
• Check cable connections.
4
THERMAL
PROTECTOR
FAULT
No 24 V DC signal on all
EPLC-6 board terminal
number 4,5,6,7,8,9
• Check the related thermal protection.
• Check auxiliary contact of relay.
• Check if the existing number of pumps is the same as set number of
pumps on Settings menu.
• Check cable connections.
5
SENSOR 1 FAULT
The sensor signal value
connected to EPLC-
6 panel number 35
terminal is less than a
proper working sensor
current (4mA ).
• Check pressure transmitter.
• Check pressure transmitter 4-20 mA signal with Ammeter.
• Check pressure transmitter cable directions.
• Check cable connections.
6
SENSOR 2 FAULT
The sensor signal value
connected to EPLC-
6 panel number 37
terminal is less than a
proper working sensor
current (4mA ).
• Check pressure transmitter.
• Check pressure transmitter 4-20 mA signal with Ammeter.
• Check pressure transmitter cable directions.
• Check cable connections.
7
MINIMUM
PRESSURE FAULT
System pressure value
is less than “Minimum
Pressure Protection
Value” during “Minimum
Pressure Protection
Time”
• Check “Minimum Pressure Protection Value” parameter on Settings
menu.
• Check “Minimum Pressure Protection Time” parameter on Settings
menu.
• Check the difference between system pressure value on manometer
and screen,
• Be sure that transmitter maximum value is same as the value set on
Settings menu
• Check if suction line is blocked or there is any leakage on the
system
8
MAXIMUM
PRESSURE FAULT
System pressure value
is more than “Maximum
Pressure Protection
Value” during “Maximum
Pressure Protection
Time”
• Check “Maximum Pressure Protection Value” is in line with system
hydraulic characteristics
• Check “Minimum Pressure Protection Time” parameter on Settings
menu.
• Check the difference between system pressure value on manometer
and screen,
• Be sure that transmitter maximum value is same as the value set on
Settings menu
9
DRIVER FAULT
No 24 V DC signal on
EPLC-6 board terminal
number 10.
• Check driver supply and fuse
• Check the cable connection between driver fault terminal and EPLC
6 terminal number 10
Table 4. Panel Troubleshooting Table
