FANUC Alarm SRVO-230 — SERVO Chain 1 (+24v) abnormal

Description

A single chain 1 (+24V) failure occurred.

Remedy

1. Repair the circuit of the chain 1 (+24V) on the hardware. 2. Set CHAIN FAILURE detection to TRUE on the SYSTEM/CONFIG screen. 3. Press RESET on the teach pendant.

Field diagnosis

Fault detected on chain 1 of the dual emergency stop circuit. At power-up, a teach pendant of a different specification (RIA/CE versus standard) gives the same code.

What to check

• Check the alarm history: if the code accompanies an operator panel, teach pendant or deadman switch stop, repeat the action (press, then release fully); the appearance of SRVO-236 confirms the chain has been restored, then reset.
• Otherwise check the teach pendant specification, then the devices wired on both channels.
• Note: Never reset a chain without understanding which channel dropped out: with one dead channel, the emergency stop is no longer redundant.
• Diagnostic sequence “Dual emergency stop circuit”: A chain code (230/231, 266…275, 370…373) means that only one of the two redundant channels has switched: the robot still runs, but safety is no longer redundant. Identify the channel from the number (1 = +24 V, 2 = 0 V), reproduce a firm operation of the device concerned, wait for the chain-repaired message, then RES_1CH and RESET. Never reset without having found the cause.

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