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Mitsubishi TS1860N1170 | Servo Motor Shaft Encoder — New Original, Fast Ship

Part Number: TS1860N1170

Cross Reference: TS186ON117O (display variant)

Manufacturer: Mitsubishi Electric (Japan)

Product Type: Shaft Encoder — Servo Motor Feedback Device

Precision Feedback for Servo Systems

The TS1860N1170 is a shaft encoder from Mitsubishi's TS1860 series — a high-resolution feedback device that mounts on the servo motor shaft and provides accurate position and speed data to the Mitsubishi servo amplifier. This real-time feedback is the foundation of closed-loop servo control: the amplifier continuously compares the encoder's position signal against the commanded position from the CNC controller and adjusts motor current to eliminate any error.

In Mitsubishi's servo system architecture, the TS-series encoders use a serial communication interface rather than traditional incremental A/B quadrature signals. The serial protocol allows the encoder to transmit multi-turn absolute position data alongside speed feedback over a single cable, and to store motor-specific parameter data in an internal chip that the servo amplifier reads at power-up. This is why Mitsubishi servo encoders cannot simply be swapped for encoders from other manufacturers — the serial data format and the motor parameter storage are proprietary.

TS1860 Series Characteristics

The TS1860 designation identifies the encoder's resolution class and design generation within Mitsubishi's TS encoder family. The 1860 series delivers high pulse resolution matched to the precision requirements of Mitsubishi's MR-series servo amplifiers. The N1170 suffix identifies the specific variant within the series — connector type, cable length, and interface specification.

Related variants in the same series include TS1860N1171 and adjacent numbers, which may differ in shaft dimension, connector orientation, or cable configuration. Confirm the exact TS1860N1170 variant matches the installed motor before ordering.

New Original Availability

New original TS1860N1170 encoders from Mitsubishi are the recommended replacement for servo motor encoder failures. Original Mitsubishi encoders carry the motor-specific parameter data pre-programmed in the internal memory chip — essential for the servo amplifier's initial motor identification at power-on. Third-party encoder replacements typically lack this pre-programmed data, requiring additional parameter configuration that may not be supported for all amplifier models.

Key Specifications

FAQ

Q1: The servo amplifier shows encoder alarm E1 or a position deviation alarm after the encoder was replaced. What should be checked?

Encoder alarms immediately after replacement are typically caused by incorrect cable seating at the encoder connector — particularly the serial data signal wires. Remove and reseat the encoder cable at both the encoder and amplifier ends. If the alarm persists with a confirmed-good connection, verify the replacement encoder's TS1860N1170 part number matches exactly — an incorrect variant with different parameter data will cause the amplifier to reject the encoder identification.

Q2: The TS1860N1170 encoder is described as having a serial interface. Can it be connected to a non-Mitsubishi servo amplifier?

No. Mitsubishi's TS-series encoders use a proprietary serial protocol specific to Mitsubishi MR-series amplifiers. The data format, timing, and motor parameter storage are not compatible with servo amplifiers from other manufacturers. The encoder must be used with a matching Mitsubishi MR-series amplifier.

Q3: Is the TS1860N1170 an absolute or incremental encoder?

The TS1860 series supports multi-turn absolute position — the encoder retains absolute position through power cycles using battery backup. This eliminates the need for a homing cycle at machine startup. When the battery voltage drops below threshold and absolute position is lost, a "return to reference position" alarm is generated and the axis must perform a homing operation before resuming normal operation.

Q4: The encoder has been physically damaged — the cable exit is cracked. Can the cable be replaced separately?

The TS1860 series encoder cable is part of the encoder assembly in most configurations. A cracked cable exit at the encoder body risks intermittent connection and position errors. If the encoder body itself is undamaged, a specialist servo encoder repair company can sometimes replace the cable assembly. If the encoder housing is damaged, full replacement with a new TS1860N1170 is the safer option to ensure long-term reliability.

Q5: How is the battery for the absolute position backup in the TS1860N1170 maintained?

The absolute position backup battery is typically located in the servo amplifier (for Mitsubishi MR-series systems), not in the encoder itself. The amplifier supplies battery voltage to the encoder via the encoder cable. Battery replacement is performed at the servo amplifier — the encoder does not contain a user-replaceable battery cell. Follow Mitsubishi's specified battery maintenance interval to avoid unexpected position loss.