Watchdog Relay Function

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The Watchdog relay for the ACR controller cards (except the ACR1500) is a dry contact reed relay. The contacts are rated at +24VDC @ 1.0 A. These contacts are not AC rated. The Watchdog outputs of the ACR1500 are Open-Collector Output and are rated at +24VDC @ 30 mA. The emitter of these outputs is connected to the 5VDC common power applied to the ACR1500. This relay is accessed through the P2 connector. The connections are labeled WD-COM (Watchdog Common), WD-NO (Watchdog Normally Open) and WD-NC (Watchdog Normally Closed).

This relay is intended to be used in safety interlock circuits used in a system operated by an ACR controller card. The Watchdog relay is energized when power is applied to the ACR card and passes a DSP function check.

NOTE: The 5 volt power applied to the DSPs used with ACR controller cards has a rating of +5VDC +/- 0.2VDC. The card will not operate in low voltage conditions.

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