Shanghai STEP Electric Corporation
Chapter 3 Product function
registered. Then the elevator returns to the base station, turns off in-car lighting and fan after
opening the door automatically, lighten the door-opening button indicator, and automatically close
the door when 10 seconds time delay expired. Finally, the elevator stops running, and will be back
to operation when the lock-in switch reset.
29 Protection against Door-opening outside Door Zones
The door cannot open outside the door zone, which is preset by the system for safety concern.
30 Light Gate Protection for Doors
every elevator is equipped with a light gate door protection, whenever any object appears or stays
between the closing doors, the light gate protection or safety contact plate will be activated to
reopen the doors. The light gate protection is not in effect when elevator is in fire-fighting mode.
31 Over-load Protection
With the over-load switch functioning, the door remains open with alarm buzzing on
32 Anti-nuisance at Light-load
when the elevator is in light-load mode, the in-car registrations have reached or exceeded the
setting value. The system will clear all the registrations.
33 Reversing Protection
when the system has detected an inconsistency between the elevator registered direction and travel
direction for a while, an emergency stop will be activated with alarm buzzing on.
34 Operation Time Limiter
If the elevator in operation has traveled incessantly for a longer time than the value preset by the
time limiter (max.45s) without leveling, all elevator operation will be stopped.
35 Deceleration switch failure protection
When encountering the deceleration switch failure, elevator land in emergency to avoid possible
top or bottom floor collision
36．Protection against terminal overtravels
both the uppermost and the lowest ends of the hoistway are mounted with limit switches and speed
retardation switch to prevent any elevator over-travels
37 Contact Detection protection of Safety Relay and Contactor
The system checks up the contact reliability of the safety relays and contactors. If any
inconformity between the contact movement and the working status of the coil is detected, all car
movements will be stopped.
38.Main Circuit Fault protection:
Emergency stop occurs once system receives the signals indicating failure of main circuit. This
function is also able to prevent running of a elevator at fault.
39 Master CPU Protection by WDT
The master control PCB is integrated with WDT protection. When any CPU or program problems
are detected, the WDT Circuit will make a forced cutoff at the output terminals of the Master
Control and reset the CPU.
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