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ErrorLib — Industrial Fault Code Library

Disclaimer: ErrorLib is an independent technical reference tool. While we aim for accuracy, always verify with the manufacturer’s official service manuals before performing maintenance on industrial equipment. ErrorLib is not affiliated with the brands listed.

bAT

Keypad Battery Low Voltage

Yaskawa · V1000

What does bAT mean?

The keypad battery voltage has fallen below the acceptable threshold, indicating a low power state. If left unaddressed, this can lead to loss of real-time clock functionality or stored parameter values on the keypad. It is a precursor to complete battery failure.

Common Causes

  • The keypad's internal battery has reached its end of life and can no longer hold sufficient charge.
  • Extended periods of the drive being powered off, causing the battery to drain without recharge (if applicable).
  • A defect in the keypad's battery charging circuit, preventing proper recharging.
  • Incorrect battery type installed (if user-replaceable), leading to rapid discharge or incompatibility.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Locate the battery compartment on the keypad (often on the rear) and carefully open it.

  2. 2

    Replace the old battery with a new, compatible type (e.g., CR2032 lithium coin cell) as specified by the manual.

  3. 3

    After battery replacement, navigate to the keypad's time and date settings and reset the real-time clock.

  4. 4

    Verify the keypad's diagnostic menu (if available) shows the battery voltage as acceptable.

  5. 5

    Ensure the keypad is properly seated and connected to the drive to allow any charging functionality to operate.

Browse all codes in this manual (87)
Verified technical data. Last updated: April 2026

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Source: Yaskawa V1000
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