We just installed some UPS units for battery lowering on a TAC20 duplex. The cars recover properly but when car 1 in the group is tested it knocks out the hall calls in the group and car 2 is a dead duck. The group status changes to EmerPower. Is this a problem with TAC20 group software. The EPNP input on car 2 never goes low but the signal is being communicated through the group communication. EPNP inputs are isolated and all parameters seem to be correct.
Anyone got an ideas?
