Set the idle voltage to roughly 230V for a 220V system, or 115V for a 110V system under no-load conditions. Troubleshooting Common AVR Wiring Issues
Based on data from multiple suppliers, the AN-5-203 AVR has the following electrical characteristics:
Adjusts the response time of the AVR to prevent voltage hunting. Under-Frequency Protection (U/F):
: Includes adjustable settings for 50Hz or 60Hz operation to protect the generator during under-speed conditions. Zhengzhou Atechi Machinery Co., Ltd. Installation Safety Tips Professional Only
The sampling wires are likely disconnected or broken. The AVR assumes output is zero and forces maximum excitation power. an-5-203 avr wiring diagram pdf
and Line 4 (Blue) serve as the primary power input terminals for the AVR. Excitation Output (F+ & F-):
generators (typically 13–25 kVA models). It functions by monitoring generator output and adjusting the exciter field current to maintain a stable voltage. AliExpress Wiring Overview
If the voltage "hunts" (bounces up and down), adjust this screw until the needle or digital display stays steady.
: Monitor the output voltage directly across the phase lines. Set the idle voltage to roughly 230V for
| Possible Cause | Solution | |----------------|----------| | Remote trimmer misadjusted | Adjust ±15% range | | Wrong frequency setting | Check 50Hz/60Hz jumper | | Sensing loss | Verify auxiliary winding voltage (5-200V AC) | | Under-speed condition | Check engine governor |
Installation and testing should only be performed by qualified personnel. Avoid touching the AVR while the generator is running to prevent electric shock.
Searching for a loose JPEG image on a forum might give you a general idea, but it is not a substitute for the official PDF. Here is why the is critical:
: Draws raw operating power for the AVR's internal thyristor switching circuit. Zhengzhou Atechi Machinery Co
Most AVRs in this class have a similar layout. You will typically find a terminal block with screws for wiring and a row of trim pots (adjustment knobs) on the front.
: Usually marked as terminals J and K (or F+ and F- ). These supply the DC current directly to the generator's exciter field winding.
| Problem | Likely Cause | Check in Diagram | | :--- | :--- | :--- | | No output voltage | Blown fuse on E1/E2 or S1/S2 | Locate fuse holder symbols; check continuity. | | High voltage (300V+) | Sensing circuit open (S1/S2 not connected) | Verify all sensing wires are tight. | | Low voltage under load | Loose F+ or F- connection | Check field wiring; measure field resistance. | | Voltage hunts (oscillates) | External pot wired incorrectly | Verify A+ and A- wiring; check for shorted wires. | | Voltage drops at high RPM | Wrong frequency jumper (60Hz running at 50Hz setting) | Set J1 correctly per the diagram. |