Home › ZAPI Controllers › MDI-PRC 55
What this code means
The SW continuously matches the potentiometer connected to CNA#18 with the Main Lifting/Lowering pair request (CNB#9 and CNB#8). When the TRUCK TYPE is set 2, the alarms occurs in the following conditions: - If both the Main Lifting and Main Lowering request are disactive and the potentiometer voltage is higher than 60 mV over either the MIN LIFT or the MIN LOWER (see “Adjustments” submenu) setting. - If the Main Lifting request is active and the potentiometer voltage is higher than 200 mV over the MAX LIFT setting (see “Adjustments” submenu). - If the Main Lowering request is active and the p
Applies to: ZAPI AC-0 SSL Sensored inverter (traction configuration).
Possible causes / checks (from the source)
Check the Main Lifting/Lowering pair (CNB#8 and CNB#9) and the voltage on the potentiometer connected to CNA#18. (Use the readings LIFTING SWITCH, DESCENT SWITCH and LIFTING CONTROL in the TESTER to facilitate the troubleshooting).
Need the part?
If diagnosis points to a failed sensor, solenoid, controller or harness part, send us the code (MDI-PRC 55), machine model and serial number — we quote genuine and OEM replacement parts for export.
Ask for the replacement part on WhatsAppSource: ZAPI AC-0 SSL Sensored User Manual (AE0ZP0EC) via ManualsLib; corroborated by ZAPI AC0 Inverter manual (eastelite.co.za). Cross-checked in two independent sources. Compiled 2026-10-30. No manufacturer affiliation.