1. Model Code Definition

• CACR-SR: Vintage analog servo amplifier platform for Yasnac VS CNC controller

• 03: Rated output power = 300W (0.3kW)

• A: Standard main PCB base specification

• C: Revised internal power & control circuit (core difference vs AB1ER: different internal PCB layout, optimized for higher instantaneous load capacity)

• 1: Differential line-driver pulse position command input (open-collector/differential pulse input; opposite to "2" = ±10V analog voltage command)

• E: Matched for 1500PPR incremental encoder feedback

• R: Standard housing & base mounting structure (no OEM customized Y-suffix parameter lock)

2. Electrical Specifications

• Input Power: Single/Three-phase AC 200~230V, 50/60Hz industrial 200V class input

• Continuous rated output current: 3.0A

• Peak overload current: 8.5A

• Compatible Servo Motors: Yaskawa USAM-03 / USAF-03 300W series servo motors with 1500PPR incremental encoders

• Control Mode: Current + speed + position triple closed-loop; default receives differential pulse command from CNC controller (±10V analog function optional via parameter setup)

3. Connector Definition

1. Main power terminals: R/S = AC input; U/V/W = motor three-phase output; spare terminals for external dynamic brake resistor

2. CN1 (50Pin control connector): Unique pin assignment for AC version, different from AB1ER; dedicated wiring for differential pulse input, servo enable, ready output, fault alarm signals

3. CN2 (20Pin encoder port): Universal SR-series pinout for 1500PPR incremental encoder wiring, same as AB/AC full SR03 family

4. Environmental & Mechanical Parameters

• Operating temperature: 0℃ ~ +55℃; Storage temperature: -20℃ ~ +60℃

• Ambient humidity ≤95%RH non-condensing; Max installation altitude ≤1000m above sea level

• Protection grade: IP20 (cabinet-only installation); Net weight ≈3.5kg

• Cooling method: Natural convection cooling for 300W low-power design

5. Parameter & Functional Features

• All speed/position loop gain, pulse scaling, input filter parameters are factory-unlocked, fully adjustable via front panel digital keypad (no OEM parameter lock like Yxx customized variants)

• Supports jog operation, no-load motor test, pulse/analog command switching via internal parameter modification

• Single-digit LED fault/status display on front panel

6. Standard Fault Codes & Protection Functions

• 1: Overcurrent fault

• 2: Abnormal input power supply

• A: Encoder cable break/open circuit

• F: Internal overheat shutdown

• C: Main control board malfunction

  Fault reset: Cut off main power ≥30s after troubleshooting before restart

7. Replacement & Compatibility Note

1. Direct plug-and-play only with identical CACR-SR03AC1ER unit

2. Cannot directly swap with CACR-SR03AB1ER: different CN1 pin definition & internal circuit; full CN1 rewiring + parameter calibration required for replacement

3. Cannot replace Y-suffix custom drives (Y1/Y3/Y82/Y105): Y-type has locked OEM parameters & customized CN1 pinout; full wiring rearrangement needed

4. CACR-SR03AC2ER (analog input model): Command type differs completely, pulse input disabled by default, cannot direct interchange

8. Application