Product Description:

The 7426AC is a DC servo amplifier from Copley Controls that belongs to the DC Servo Amplifiers series. It links a motion controller’s ±10 V command signal to a permanent-magnet DC motor, delivering regulated power that translates voltage commands into motor torque. The amplifier performs current-loop control and high-frequency switching so an axis can track position or velocity references with low error. Its compact format and single-axis design make it suitable for machine tools, semiconductor handlers, and general-purpose automation equipment requiring responsive servo performance.

Under continuous loading, the amplifier delivers 10 A of motor current while maintaining a bus voltage of 250 V, allowing sustained operation on moderate-power axes. A commanded step can draw up to 20 A for brief accelerations, and the transistors switch at 25 kHz, keeping audible noise low and smoothing current ripple. The small-signal loop tracks changes up to 3 kHz, so control gains can be set aggressively without instability. A minimum load inductance of 800 µH prevents excessive current rise, and an on-state resistance of 0.15 Ω limits thermal loss. Logic inputs recognize levels above 2.5 V, while a 94 kΩ reference input keeps controller outputs lightly loaded. The peak output voltage reaches 205 V for rapid motor reversal.

Protective thresholds support power integrity and fault handling. The maximum inrush current is 37 A, while nominal line demand remains near 16 A during operation. An internal fuse rated at 20 A and 250 V protects the supply rail. The overvoltage circuit latches the output off at 390 VDC, while the undervoltage detector trips at 45 VDC to prevent the control logic from switching incorrectly. Thermal monitoring disables the drive at 70 °C, preventing device damage in congested panels. Shutdown states clear only after the fault disappears and the command input is cycled, maintaining predictable restart behavior.