FAQ

Where can I get pre and post transfer signals on the ATS?
Accessory 31Z is a selective load disconnect that sends a pre- transfer and post transfer signal. The
length of the pre and post transfer delays can be set to 0-5 minutes. Refer to your units wiring diagram
for reference to the correct points on the customer block.
You can get pre-transfer and post transfer signals from an accessory 31Z (Selective load disconnect
contacts) if the transfer switch came with the feature. Refer to the transfer switch wiring diagram and it
should look like figure A (but not exactly the same). If you don’t have this feature on your switch, contact
an ASI technician so they can set-up the feature or call 1-800-800-ASCO (2726) option 1.
Figure A. Selective load disconnect terminal connections
Where can I get source availability signals?
Accessory 18B/18G or source availability contacts are customer contacts added as optional accessory
for the ATS to indicate separate source availability on utility/emergency source regardless of the switch
position. Refer to diagram for example.
You can get source availability signals through an accessory 18B or 18G. The terminal connection would
look like the one shown on Figure B (but not exactly the same). If you don’t have this feature installed on
your switch you may contact an ASI technician or 1-800-800-ASCO (2726) option 1 to have it set-up.