21 UCLS is a geared unit with a 6850DK Selector(No Advancer Panel). To run on Inspection you need DX-HX which picks D and H. If the relays are picking you have another deeper problem in the Generator Leveling Field Circuit. If they are not picking when you press safe button and Down check the bottom limits on 6850DK selector. The bottom most limit controls DX. The limit above will drop FE. These limits on the DK Selector are the NTS System for the Unit. The switches top and bottom mounted in the Hoistway which causes an Emergency Stop if FE is still in when it is hit at either Terminal is the ETS System. Those selector limits are weak spots and get covered with oil or dirt. My advice is to check them first.
