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OTIS elevator main board LCB-II GGA21240D1 has chip and non-chip versions at different prices. On-site confirmation of the inverter power rating is required for accurate parameter matching.
The LCB-II series consists of three models: GDA21240D1, GFA21240D1 and GGA21240D1. Higher versions can replace lower ones, but GGA21240D1 and GFA21240D1 cannot substitute GDA21240D1. Mismatched hardware interfaces may cause motherboard burnout or elevator failure.link:https://www.nonaelevatorparts.com/elevator-parts-for-otis/otis-elevator-main-board-lcb-ii-gga21240d1.html