Home Forums General Discussion Technical Questions another 21ucl issue doors this time??!!!!

what selector is there or no selector at all? plus it really depends on the door open cct.

is it any particular direction? i wonder if you hall calls are cancelling(UHR,DHR)? i dont think its this but check it.if its all directions and the rear 1do,2do are coming in it really sounds like the do cct. the difference between when the lift is there or not is that 1 part of the cct that calls the lift and the other is that it doesnt need to do so the same common door open cct exists for both situations.

i think the system works sort of like this.

for a 10 ucl.


up hall on 2 is set.
2u sets.
hst relay pulls in thru uhr & uhc and 2u 3,4.
hst 11,12 pull in nt.
i think dz 1 & 2 make at this time.
nt 11,12 pulls in ntx.
nt 3,4 pulls in d1r,d2r.
d2r 3,4 & 11,12 energise dma and doors should open.

this sequence can be for your lift.also this is why i sadi to bridge a spare trailer(if you have 1) as you dont have to run a new 1 and/ or change it, you just bridge 2 together as its easier.