Surely, several years from now, a third generation of controls will add another vintage to the list. Another important consideration when developing a maintenance schedule is the equipment condition. Seals, commutators, relays, rollers, sheave grooves and door equipment must be in good, working condition. If they are not, then the equipment is more maintenance-intensive. Depending on the severity, routine examinations may need to be done biweekly or every third week.
Usage is another important consideration when determining the routine-examination frequency.
For traction elevators, the number of stops, for normal usage, should be less than 10,000 per month. As the stops per month increase appreciably over 10,000, consider increasing the examination frequency from monthly to every three weeks, or sooner, in some high-usage categories. Elevators in some high-use buildings may have 80,000 or more stops per month. Escalators and walks operating more than 400 hours per month will require monthly or more frequent routine examinations. Brakes', moving selectors', controllers' and governors' tests will require periodic maintenance one to four times annually.