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Now we monitor the proper operation of the relays by periodically plugging each LC-1800 into a 140 VAC autotransformer, attaching a VOM to one of the output duplexes, and slowly turning the autotransformer voltage down from 140 to 87, watching the VOM to see that the relays engage the various secondaries on the LC-1800's transformer and thus keep the output voltage in the 110-120 VAC range.
Do the LC1800s sold today have an indicator or alert when a relay dies?
For datasheet, refer the below link-
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