YASKAWA JZSP-CVP60-20 Driver and Motor Cable JZSPCVP6020

JZSP-CVP60-20 | Yaskawa Sigma-7 SGM7G Encoder Feedback Cable — 20m / Absolute Encoder / Battery Case / Shielded / Straight Connector

The Encoder Cable's Role in a Sigma-7 Servo System

A Sigma-7 servo system has two cable connections between the motor and the servo drive: the power cable (supplying three-phase AC to the motor) and the encoder feedback cable. The encoder cable carries:

• Encoder signal: The serial data stream from the 24-bit absolute encoder inside the SGM7G motor to the SGDV servo drive
• Battery supply: DC voltage from the battery case on the cable assembly to the encoder's non-volatile memory circuits

Both signals run through the JZSP-CVP60-20 in a single shielded cable assembly. Only the correct encoder cable for the specific motor series provides the matching connector, wire count, shielding arrangement, and battery case that the SGM7G requires.

Key Specifications

Battery Case — Maintaining Absolute Position Through Power-Off

The JZSP-CVP60-20 includes an integrated battery case in the cable assembly. The battery inside this case provides continuous low-current power to the SGM7G motor's absolute encoder circuits when the servo drive is powered down.

The absolute encoder stores shaft position in internal non-volatile memory. This memory requires a small supply current to maintain its count across power-off periods. When the servo system is powered off — at end of shift, during maintenance, or during an emergency stop — the battery in the cable assembly maintains the position count without interruption. On the next power-up, the servo drive reads the encoder position immediately and the axis is ready without a homing cycle.

A failed or depleted battery is detected by the servo drive as an encoder battery alarm. The alarm indicates that battery voltage has dropped below the threshold required to guarantee position data integrity. Replace the battery promptly when the alarm appears to prevent position data loss on the next power-down cycle.

Application Scenarios

Gantry-mounted SGM7G motor: A large gantry system has the SGM7G-13A7C61 motor mounted at the top of the structure. The servo drive panel is at floor level, 18 metres away. The JZSP-CVP60-20 at 20 metres provides adequate length for the routing path from motor to panel with slack for service loops.

Rotating table servo axis: The SGM7G motor drives a rotating table. The servo drive is in a panel 15 metres from the machine. The 20-metre cable routes through the cable tray to the drive with appropriate service loop.

Encoder cable replacement: The installed JZSP-CVP60-20 has been damaged by mechanical abrasion or crushing during maintenance. The replacement cable at the same length restores the encoder feedback path without requiring drive reconfiguration — the cable length does not change the servo system's parameter setup.

FAQ

Q1: Is the JZSP-CVP60-20 a fixed-application cable or can it be used in moving (drag chain) installations?

The CVP-series cables with standard PVC jacket are classified for fixed (static) installation — cables that remain in position after routing. For applications where the cable moves continuously with the axis (drag chain, cable carrier systems), a high-flexibility version designated as flex-type (e.g., CVP26 series or similar) with a flexible jacket rating is required. Using a static-rated cable in a continuous-flex drag chain application shortens cable service life significantly.

Q2: How should the JZSP-CVP60-20 be routed in relation to motor power cables?

Encoder feedback cables carry low-level serial signals that are susceptible to electromagnetic interference from the high-current, PWM-switched motor power cables. Maintain a minimum separation of 30 cm (300 mm) between the JZSP-CVP60-20 and motor power cables when routing in parallel. Where crossing is unavoidable, cross at 90 degrees rather than running parallel. Use cable trays with separate compartments for signal and power cables in panel and tray routing.

Q3: Can the battery in the JZSP-CVP60-20 be replaced without replacing the full cable?

Yes. The battery case on the JZSP-CVP60-20 is a user-replaceable component — the battery cell is accessible within the case. The battery type is specified in the Yaskawa SGDV servo drive user manual (battery for absolute encoder use). Replace only with the specified battery type to ensure correct voltage and capacity. After battery replacement, confirm the servo drive's encoder battery alarm has cleared before returning the axis to operation.

Q4: What shielding termination is required when installing the JZSP-CVP60-20?

The cable shield should be connected at the servo drive end, not at the motor end. Single-point grounding of the shield at the drive's FG (frame ground) terminal prevents shield current from creating a ground loop between the motor frame and the drive panel. The motor end of the shield is connected within the encoder connector assembly — do not add an additional ground connection at the motor end during installation.

Q5: What happens if the JZSP-CVP60-20 is routed near high-frequency switching devices?

High-frequency noise from VFDs, contactors, and solenoid drivers can couple into the encoder signal cable if routing practices are not followed. The shielding in the JZSP-CVP60-20 provides a defined level of EMC protection — it attenuates coupled interference but does not eliminate it. In environments with extreme electrical noise, additional measures include ferrite cores on the cable, routing inside metallic conduit, and ensuring all panel grounding is completed to the machine frame before commissioning.