Vertical Transportation System Fault Detection and Diagnostic

This article is about general and Fault Detection and Diagnostic for Vertical Transportation System used in Integrated Automation System or Building Automation System.

Vertical Transportation System Fault Detection and Diagnostic

Bad Energy Data
1. Description:
  - Find periods for at least a duration when data contains values outside of low and high limits or the data is shown as “not a number” (NaN). Fault dependencies and associated scenarios include the following;
  - All data will be imported into the SCMS ‘as is’ from its existing system.
2. Requirements
  - Consumption or Demand Point: Any point that has consumption or demand type units.
Cab Recall Failure
1. Description:
  - Generates a fault if an elevator cab fails to recall to a requested floor. This is an indication of an internal cab fault or an error associated with the cab recall switch. Fault dependencies and associated scenarios include the following;
  - The fault rule will ensure the specific elevator cab is not currently utilized or under a maintenance shutdown.
  - The fault rule will ensure the recall switch, as managed by the elevator management system (EMS) is currently registering values therein.
2. Requirements:
  - Floor Recall Command: Floor recall command is required, but status can be used as a primary reference.
  - Elevator Cab Status: Current operating position of the elevator cab.
Cab Maintenance Failure
1. Description:
  - Generates a fault when the elevator cabs have been operating without a required maintenance shutdown as measured by an hourly timer. This indicates that the elevator cab has not received required maintenance and inspection and is more susceptible to operational interruptions. Fault dependencies and associated scenarios include the following;
  - The fault rule will ensure the specific elevator cab is not currently under a maintenance shutdown.
  - The elevator manufacturer’s recommended maintenance procedures intervals are programmed as the hourly setpoint timer.
2. Requirements:
  - Elevator Cab Status: Current operating position of the elevator cab
  - Maintenance Hourly Timer Setpoint: Measured in hours according to manufacturer’s recommendations.
  - Elevator Cab Operation: Amount of time, as measured in hours, that the elevator has been in operation since a required maintenance shutdown.
Double Dipping Data
1. Description
  - Finds periods for at least a duration when a point’s history contains two or more data points within a leeway of an interval. Fault dependencies and associated scenarios include the following;
  - All data will be imported into the SCMS ‘as is’ from its existing system.
2. Requirements
  - Consumption or Demand Point: Any point that has consumption or demand type units
Missing Data
1. Description
  - Finds periods for at least a duration when a record’s history contains zero data points within a leeway of an interval. Fault dependencies and associated scenarios include the following;
  - All data will be imported into the SCMS ‘as is’ from its existing system.
2. Requirements
  - Consumption or Demand Point: Any point that has consumption or demand type units
Sensor Failure
1. Description:
  - Finds periods over a duration when a sensor does not change by a threshold for a 24-hour period and equipment is running.
2. Requirements:
  - Sensor: Any numerical data point, including statuses and operating mode(s).