1. Model Definition & Code Breakdown

• CACR-SR: Vintage analog servo amplifier series dedicated for Yasnac VS CNC control system

• 03: Rated output power 300W (0.3kW)

• A: Standard main control board specification

• B: Revised internal power circuit layout

• 2: Analog voltage speed/position command input (core difference vs AB1ER: AB1=line-driver differential pulse input; AB2=±10V analog signal input)

• E: Matches 1500PPR incremental encoder feedback

• R: Standard base & housing structure (no OEM customized suffix like Y82/Y1/Y3)

2. Key Electrical Specifications

• Input Power: Single/Three-phase AC180~230V 50/60Hz (200V class industrial input, standard universal power, different from 100V BB series)

• Rated Output Current: 3A continuous

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

• Control Mode: Triple closed-loop (current + speed + position); primary control via 0~±10V analog speed/position command from CNC controller, pulse position input is not the default setting

3. Connector & Terminal Description

1. Main power terminals: R/S for AC input; U/V/W for servo motor connection; spare terminals reserved for external dynamic braking resistor

2. CN1 (50Pin control connector): Standard universal pinout for AB2 version, designed for analog signal wiring, fully different pin definition from AB1ER (pulse type) and Y-suffix customized drives (Y1/Y3/Y82)

3. CN2 (20Pin encoder port): Standard universal pin layout, compatible with all SR03 series 1500PPR encoder wiring

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 mounting only); Net weight ≈3.5kg

• Cooling: Natural convection cooling for 300W low power model

5. Parameter & Operating Features

• All core gain parameters (speed/position loop gain) are factory default open for modification via front panel keypad (no parameter lock unlike Y82 customized variant)

• Supports free parameter adjustment for speed scale, analog input gain, IO logic without OEM limitation

• Widely used for general Yasnac VS800 lathe/machining center feed axis (X/Z axis standard drive)

6. Fault Code & Protection Function (Same SR series standard codes)

• 1: Overcurrent fault

• 2: Abnormal input power supply

• A: Encoder cable disconnection

• F: Drive overheat protection

• C: Main control board malfunction

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

7. Replacement Notes (vs CACR-SR03AB1ER / Y-suffix models)

1. Cannot directly swap with CACR-SR03AB1ER: AB1 receives differential pulse command, AB2 receives analog voltage command → full CN1 rewiring + parameter reset required for interchange

2. Cannot direct replace Y1/Y3/Y82 customized drives: Yxx has locked parameters & customized CN1 pin assignment; AB2 standard drive needs full wiring rearrangement and parameter rewriting before substitution

3. Direct plug-and-play only with identical CACR-SR03AB2ER original unit

8. Application Scope