A Fast Diagnosis Method of Escalator Reversal Faults Based on Dynamic Information and Multiattribute Decision-Making

Table 1

Event code.

Event symbol	Event name
T	Escalator reversal
M1	Nonmanipulative reversal
M2	Torque chain instability or broken chain
M3	Voltage fluctuation
M4	Underpowered
M5	Power drive chain broken
M7	Traction chain broken
M8	Insufficient braking friction
X1	Overload
X2	Gear meshing failure of gearbox
X3	Damaged gearbox bearings
X4	Insufficient grid voltage
X5	Motor power is too small
X6	Reversal protection device fails
X7	Deformation and damage of drive chain
X8	Loose host position
X9	Damaged rung chain
X10	The brake is not working properly