Kkg21a-c1 Manual

. It provides critical instructions for safety, installation, and daily operation. Key Features & Operation

| Symptom | Likely cause | Action | |-------------------------|----------------------------------|---------------------------------------| | No LED | No power | Check 24V supply and wiring | | ERR blinking | Modbus timeout / no response | Verify baud rate, address, and cable | | Output not switching | Overload or short circuit | Check load current and output fuse | kkg21a-c1 manual