Lovato 31 Rgam 12 User Manual ◉

| Parameter | Description | Typical Value | Why it matters | | :--- | :--- | :--- | :--- | | | Mains undervoltage threshold | 184V (for 230V nominal) | Prevents transfer when grid voltage sags. | | P03 | Mains return delay (Timer T1) | 60 seconds | Ensures the grid is stable before re-transfer. | | P05 | Generator starting delay (Timer T2) | 5 seconds | Gives the generator time to start before the controller tries to transfer. | | P07 | Generator stabilization delay (Timer T3) | 10 seconds | Allows generator voltage/frequency to stabilize. | | P10 | Generator stop delay (Timer T4) | 180 seconds | Cool-down period for the generator after load is removed. | | P15 | Remote test enable | 1 (Enabled) | Allows a remote switch to simulate a mains failure. | | P22 | Display language | English / Italian | Sets the LCD text language. |

| Error Code | Meaning | Likely Cause & Solution | | :--- | :--- | :--- | | | Loss of phase L1 on Mains | Blown fuse, loose wire, or utility outage. Check terminal 1. | | Err 04 | Generator frequency too low | Generator engine speed too low. Check governor. | | Err 08 | Phase rotation error | L1, L2, L3 are not in correct sequence. Swap any two phases on the input side. | | Err 12 | Emergency stop active | The external E-stop button is pressed or the NC contact is open. Check terminals 22-24. | | Err 19 | Internal memory failure | Replace the controller. This is hardware failure. | | Err 24 | Generator failed to start | The controller sent a start signal (out 15-16), but after T2+T3, no voltage was sensed on L1’-L3’. Check fuel, battery, and starter motor. | lovato 31 rgam 12 user manual

Whether you are an electrical contractor commissioning a new hospital generator or a facility manager troubleshooting a brewery’s backup system, keep a copy of the in your panel door. Without it, you are guessing. With it, you are in control. | Parameter | Description | Typical Value |