Why installing an Automatic Voltage Regulator (AVR) with Surge Protective Device(SPD) in Elevator is a wise decision to owners

Why installing an Automatic Voltage Regulator (AVR) in Elevator is a wise decision to owners.
Elevator control systems is complicated and sensitive circuitry since, most control modules used nowadays are almost all microprocessor based. Therefore, delicate to abrupt changes of voltages and currents or power quality(Harmonics, swells, transient surges, overvoltage and undervoltage, and lightning events) . The cost associated for replacing these circuits modules and drives is always high and these events are always seem unpredictable.
SERVICES PROVIDERS TERMS FOR DESTRUCTIVE POWER EVENTS

Most Elevator OEM provider or their service contracts either comprehensive or non-comprehensive does not and will not cover warantee of parts and performance when destructive power events like lightning, surge caused by local utility provider or internal to the building power disturbances happens. Cost that is incurred in these events will always be shouldered by building owner. And, it is seem inevitable and traditionally practiced in the field that even to defects not caused by power disturbances are blamed by Service provider on this issue.

COST INCURRED IN POWER DISTURBANCES

Major surge or lightning strikes can and may destroy sensitive electronic instruments like
•Control modules
•Drives
•Sensors

Control modules cost about P60K to P150K pesos while, drives cost about P200K to P500K depending on the its corresponding capacity. These elevators parts are not cheap and should be seriously protected to avoid any circumstantial cost on safety and equipment in the future.