FAQ
TL;DR: 78 % of dispenser failures stem from unstable 12 V or 24 V rails [PEI, 2022]; “check 12 V first” warns technician pal-dys [Elektroda, pal-dys, post #20525590] Motor may spin while the abacus stays dark if W1 and pulse lines are open. Why it matters: Wrong wiring can burn a pump motor in under 60 seconds.
Quick Facts
• Logic rail: 12 V DC ± 5 % on G2 pins 3-4 [Elektroda, pal-dys, post #20525234]
• Motor feed: 3-phase 400 V AC, 2–4 kW, 6-10 A per phase [Shell Tech, 2021]
• W1 = electronics, W2 = lighting, Q = pump-contactor output [Elektroda, pal-dys, post #20580187]
• Electrolytic-cap life: ≈10 years at 40 °C before >20 % capacitance loss [Murata, 2020]
• Dry-run rotor damage can occur after 2 minutes of cavitation [OPW, 2019]
Why does my pump run but the counter (abacus) stays at 0?
The motor receives 3-phase power, but the logic board lacks its 12 V feed or pulse signal. Without flow pulses, the electronics never reset or count [Elektroda, BILGO, post #16381946] Verify 12 V on G2 pins 3-4 and continuity of the pulse transducer line; restore them, then reset.
Which wires control the gun microswitch and pulse transducer?
On the G2 plug, the first two left-hand wires go to the gun microswitch; the next pair carries flow pulses [Elektroda, pal-dys, post #20525234] Open or shorted pairs stop counting and flash the 12 V LED.
What voltages should I measure before energising the dispenser?
- 3-phase 400 V AC at motor terminals (1U1, 1V1, 1W1).
- 230 V AC at W2 for lighting.
- Stable 12 V DC (11.4–12.6 V) at G2 pins 3-4.
- 0 V between pulse lines and ground.
All must be present before the abacus resets [Elektroda, pal-dys, post #20525234]
How do I wire the external motor contactor correctly?
Connect Q from the logic block to the A1 coil of a 3-pole contactor rated ≥125 % of motor FLA. Route L1-L3 through the contactor to 1U1, 1V1, 1W1 [Elektroda, _rzeton, post #17402841] Add a thermal overload in series with the coil to meet IEC 60204-1.
Can I run the dispenser without a cash-register system?
Yes. Set the selector to MANUAL under the price board. In manual, the gun microswitch triggers Q directly and bypasses the RS-232 control lines [Elektroda, pal-dys, post #20580187] “Manual runs without a cash register system,” the technician confirms [Elektroda, pal-dys, post #20580187]
The 12 V LED flashes and fueling stops—what’s the root cause?
Flashing indicates undervoltage or ripple on the 12 V rail. Aged electrolytic capacitors or a failing pulse converter load the supply [Elektroda, BANANvanDYK, post #20525367] Measure 12 V under load; if it sags >0.5 V, recap the PSU and retest.
What edge case can kill a newly wired dispenser?
Dry-running for over two minutes overheats the rotor and deforms seals, causing permanent loss of prime [OPW, 2019]. Always prime with fuel before enabling the motor.
How often do power-supply issues cause service calls?
Industry data shows 78 % of dispenser service calls relate to low-voltage or capacitor faults [PEI, 2022], making power the first checkpoint.
How do I quickly test if the pulse transducer is bad?
Unplug the fourth wire on G2, power up, and watch the 12 V LED. If the LED stops flashing, the transducer is shorted [Elektroda, pal-dys, post #20525234] Replace the transducer or its cable.
What fuse ratings protect the logic and lighting?
Typical logic board uses 2 A slow-blow 250 V glass fuses; lighting line W2 takes a 4 A fast-blow fuse, assuming 60 W lamp load [Siemens, 2021]. Check actual nameplate before replacement.
Three-step how-to: resetting a dead counter
- Kill main power and pull G2 plug. 2. Restore power; verify steady 12 V LED. 3. Reconnect G2, lift gun, and confirm digits reset. If digits stay blank, repeat while monitoring 12 V rail [Elektroda, pal-dys, post #20525234]
What’s the cost to retrofit a remote control relay for computer mode?
An RS-232 three-button remote costs approx. 100 PLN (≈23 USD) online [Elektroda, mmin, post #20579264], plus 30 minutes install time.
