Giddings & Lewis M.1302.7479 MMC Servo Amplifier

Technical Specifications

Model： M.1302.7479, Revision R2

Brand： Giddings & Lewis

Product Type: Cabinet mount MMC single-axis digital servo amplifier for PiC900 CNC system

Module Feature:

Function: Single-axis MMC servo drive for G&L PiC900 CNC platform. Receives SERCOS fiber digital motion commands from MMC motion control boards, drives Giddings & Lewis brushless servo motors, realizes closed-loop speed, torque and position control for heavy horizontal boring mills and large machining centers.

Command interface: SERCOS optical fiber ring bus

Feedback: Differential incremental encoder input for closed-loop position feedback

Onboard function: DSP digital control, integrated dynamic brake chopper

LED indicators: POWER, READY, AXIS FAULT, FAULT diagnostic lights

Hardware self-diagnosis: DC bus overvoltage / undervoltage, overcurrent, overtemperature, encoder signal loss, motor winding short-circuit detection

Programming software: PiCPro / MMCPro for motor parameter setup, servo gain tuning and fault history reading

Electrical Parameters

AC Input: 230V 3-phase AC

Auxiliary control power: 24VDC

Continuous output current: 12A

Peak output current: 36A

Mechanical & Structure:

Mounting: Vertical cabinet backplate mounting

Weight: 3.2kg

Protection class: IP20

Environmental:

Operating temperature: 0℃ ~ +50℃

Ambient humidity: 5~85% non-condensing

Certification: CE

Status: Manufacturer discontinued legacy PiC900 MMC single axis servo amplifier

System compatibility

Compatibility description: M.1302.7479 belongs to Giddings & Lewis MMC SmartDrive servo family. Compatible with PiC900 CNC controller, MMC motion control boards and G&L HSM series brushless servo motors. Widely installed on heavy G&L horizontal boring mills.

Function

Function description: M.1302.7479 is MMC single-axis digital servo amplifier manufactured by Giddings & Lewis. It communicates with motion control board via SERCOS fiber ring to receive high-speed digital motion instructions. It converts DC bus power into three-phase AC output to drive brushless servo motors, reads encoder feedback to implement high precision closed-loop control. Built-in brake chopper absorbs regenerative energy during axis deceleration. It is legacy heavy-duty single-axis servo spare for G&L CNC boring mills.

Installation

Installation steps: Follow lockout/tagout safety procedure before installation. Disconnect main AC power and 24VDC control power. Mount M.1302.7479 vertically on cabinet backplate. Wire three-phase AC input, shielded motor power cable, differential encoder cable and SERCOS fiber loop. Configure motor parameters and servo gains via PiCPro or MMCPro. Run drive self-test and verify axis jog, homing and positioning performance.

Interface

Interface list: 3-phase AC terminal block, motor power connector, encoder D-sub port, SERCOS fiber transmit/receive ports,on-board POWER / READY / AXIS FAULT / FAULT LED indicators for Giddings & Lewis M.1302.7479.

Diagnostic

Troubleshooting: AXIS FAULT: Encoder cable breakage, mechanical overload or position tracking error over threshold. FAULT LED lit: DC bus voltage abnormality, overcurrent, overtemperature or internal hardware damage. Axis vibration: Improper servo gain setting, insufficient brake resistance or poor cable shielding.

Product Brief

Brief description: M.1302.7479 is Giddings & Lewis legacy PiC900 MMC single axis servo amplifier,with SERCOS fiber ring digital interface for heavy CNC boring mill brushless servo motor closed-loop motion control,discontinued CNC servo drive spare.