Look for LED status indicators on the board face for power, error, and communication status.
In the world of industrial automation, legacy equipment often forms the backbone of a production line. Among the most reliable pieces of hardware from the late 20th and early 21st centuries are the servo drives manufactured by Berger Lahr. Specifically, the remains a common sight in factories utilizing older CNC machinery, textile robots, and packaging systems. Berger Lahr D450 Manual
Fault LED: If this illuminates, check for short circuits in the motor leads or over-temperature conditions in the control cabinet. Look for LED status indicators on the board