Technical Description: Heidenhain 364914-02 (ERN 1387)
The Heidenhain 364914-02 is a specialized incremental rotary encoder from the ERN 1300 series. The ERN 1387 model is the definitive industry standard for feedback in elevator (lift) traction motors. It is meticulously engineered to provide high-resolution position feedback and commutation signals for permanent-magnet synchronous motors (PMSM), ensuring the smooth acceleration and deceleration required for passenger comfort.
Commutation and Pulse Precision
This specific encoder provides 2048 pulses per revolution via a 1Vpp sinusoidal interface. What sets the 364914-02 apart is the Z1 track, which outputs one sine/cosine period per revolution for commutation. This allows the drive inverter to immediately determine the absolute position of the motor rotor upon power-up, which is critical for torque control in modern high-efficiency traction systems.
Key Characteristics
- Part Number: 364914-02.
- Model: ERN 1387.
- Pulses per Rev: 2048.
- Output Signal: 1Vpp (Sin/Cos).
- Commutation: Z1 track (1 period per revolution).
- Shaft: Tapered shaft 1:10 (9.25mm).
- Standard: Optimized for traction motor integration.
- Protection: IP40 (stator side).
Safety and Elevator Reliability
The 364914-02 is designed to withstand the continuous operational cycles of high-traffic elevator systems. Its optical scanning system is highly resistant to thermal drift, operating reliably between -40°C and +120°C. The mechanical mounting via a stator coupling and tapered shaft ensures a high-stiffness connection, preventing signal jitter that could lead to motor noise or vibration.
| Feature | Specification |
| System Accuracy | ±20″ |
| Max Frequency | 210 kHz (-3 dB) |
| Supply Voltage | 5V DC ± 5% |
Maintenance Insights
The ERN 1387 is a precision instrument. During installation, it is vital to avoid any mechanical shock to the tapered shaft. Proper grounding of the encoder cable is mandatory to prevent electromagnetic noise from interfering with the commutation signals, which could result in drive «trips» or erratic motor behavior.
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