I. Introduction

Platform screen doors (PSDs) at train or subway stations screen the platform from the train. They are a relatively new addition to many metro systems around the world; some having been retrofitted to established systems. They are widely used in Asian and European metro systems. The platform doors slide open or closed simultaneously with the train doors.

Normal operation mode
After the train parks within the required range, ATC system will give door opening or closing order to the central control cabinet (PSC). Then PSC gives order to individual DCU to implement the door opening and closing.

System Failure Mode
In case the system control fails, the station operator can open and close the platform door using the control panel in the station control room.

Door Unit Failure Mode
If the individual door has mechanical or electrical problem, the platform operator can open and close door by using local key.

II. Mechanism

PF400 Platform screen door consists of Mechanical & Electrical system. Mechanical system includes frame structure, door operator, sliding door, fixed door, emergency door, and end door. Electrical system includes power supply, door control unit (DCU), central control cabinet (PSC), and network connection equipment.

The door operator consists of driving mechanism, hanging mechanism, guiding mechanism, and locking & unlocking mechanism.

Driving mechanism
Includes DC motor and multi-head ball screw to achieve smooth motion and high reliability.

Hanging system
Includes hanger and guide rod. Hanger is connected to the door panel and meanwhile is also connected to the guide rod through the linear bearing. Therefore, the weight of door panel is transferred to the guide rod, which is installed on the frame.

Guiding mechanism
Consists of lower guide roller and track.

Locking and unlocking mechanism
Includes spring locking & solenoid activated unlocking mechanism and emergency unlocking mechanism.

DCU
Controls the door movement by getting orders from central control panel.

Sensitive edge system
The sensitive edge system is part of electrical system.

Central control Cabinet (PSC)
Consists of central logic control (PEDC) and monitoring system (MMS). The CAN based technology is used to connect the PSC and DCU.

III. Main Parameters