960903‑02（Cooper Power Tools STM12 Servo Drive）

1. Model Meaning

• STM12 = Nutrunner (torque wrench) servo controller series

• 960903‑02 = Specific part number, often labeled as 960900 Rev.03a/02 on the unit

2. Key Specifications

Input

• Voltage：230 VAC ±10%，single‑phase

• Frequency：50/60 Hz

• Power：≈2 kVA

Output

• Continuous current：10 Arms

• Peak current：20 Arms

• Motor type：AC brushless servo / resolver‑based

Control & Feedback

• Application：Torque‑controlled nutrunner / fastening axis

• Feedback：Resolver（standard for STM12）

• Control：Internal torque/position profile；±10 V analog or fieldbus option

• Safety：Overcurrent, overvoltage, overtemperature, short‑circuit

Mechanical & Environmental

• Dimensions：330 × 230 × 70 mm（approx. 13 × 9 × 2.75 in）

• Weight：≈2 kg

• Protection：IP20

• Cooling：Convection（finned chassis）

• Operating temp：0–45 °C

3. Common Applications

• Cooper / Apex torque nutrunners（assembly line fastening）

• Automotive powertrain & chassis assembly

• General torque‑critical servo axes（resolver feedback）

4. Compatibility

• Works with Cooper/Apex brushless servo motors with resolver feedback（230 V, ≤10 A）

• Not a Kollmorgen drive（separate brand；your earlier CE### models are Kollmorgen）

5. Notes

• 960903‑02 is a legacy Cooper STM12；discontinued, only available used/refurbished.

• Often seen labeled as 960900 Rev.03a/02 on the drive label.