What causes SRVO-230?

An E-stop button or deadman switch operated 'halfway' - one channel's contact made, the other didn't (check the history for which device: panel E-stop, TP E-stop, deadman). A failing contact in one channel of a safety device. Wiring fault in one chain.

How do I fix SRVO-230?

Do not reset this alarm to keep running until the fault is found and repaired: this is a dual-channel safety circuit, and one working channel is not a working safety function. The most common cause is benign (a safety device operated 'halfway,' where one channel switched and the other did not), so first check the alarm history for which device is implicated, then operate that device fully and deliberately (press the E-stop fully and release, or grip and fully release the deadman). If SRVO-236 'Chain failure is repaired' appears, the mismatch has cleared and you can run the chain-release procedure: (a) press and release an E-stop button on the pendant or operator panel, (b) press F4 'RES_1CH' on the Alarm ACTIVE screen, (c) press RESET. If it will not clear this way, one channel has a genuine fault (a failing contact or single-chain wiring), which is qualified-technician diagnosis per the maintenance manual. Never bypass a safety chain to get running.

SRVO-230

SRVO-230: Chain 1 abnormal

What it means

Dual-channel safety fault: every E-stop-type input runs on two redundant chains (chain 1 on +24V, chain 2 on 0V), and the controller saw them disagree - for SRVO-230, a chain-1 contact closed while its chain-2 partner sat open. Half-pressed buttons and half-gripped deadman switches cause most of these; genuinely failed contacts cause the rest. Clearing it requires a specific release ritual most techs have never seen.

Common causes

Ranked by what technicians most often find, most likely first.

An E-stop button or deadman switch operated 'halfway' - one channel's contact made, the other didn't (check the history for which device: panel E-stop, TP E-stop, deadman).
A failing contact in one channel of a safety device.
Wiring fault in one chain.

How to fix it

Do not reset this alarm to keep running until the fault is found and repaired: this is a dual-channel safety circuit, and one working channel is not a working safety function. The most common cause is benign (a safety device operated 'halfway,' where one channel switched and the other did not), so first check the alarm history for which device is implicated, then operate that device fully and deliberately (press the E-stop fully and release, or grip and fully release the deadman). If SRVO-236 'Chain failure is repaired' appears, the mismatch has cleared and you can run the chain-release procedure: (a) press and release an E-stop button on the pendant or operator panel, (b) press F4 'RES_1CH' on the Alarm ACTIVE screen, (c) press RESET. If it will not clear this way, one channel has a genuine fault (a failing contact or single-chain wiring), which is qualified-technician diagnosis per the maintenance manual. Never bypass a safety chain to get running.

Quick facts

Category: Servo
Affected series: R-30iB; R-30iB Mate; R-30iB Plus; R-30iB Mate Plus
Alarm family: SRVO