Interlock Safety System - Oce Arizona 200 GT User Manual

Interlock Safety System

Interlock Safety System
Introduction
The Océ Arizona 200/250/300/350 GT printer has an integrated safety interlock system
that stops all machine motion when a situation that might compromise operator safety
occurs. The printer has three Emergency-Stop buttons: one on each end of the gantry,
and one on the Control Station podium. Activating an Emergency-Stop button will
switch the Safety Monitoring Relay input circuits. This causes the system to isolate the
power to the motion control motors, and also turns off the Océ Arizona 200/250/300/350
GT curing system (UV lamps). The Maintenance Station and the Safety Gate on the
carriage also have an interlock function. Beacons lights indicate the status of the safety
system as explained in this section.
How the Interlock System Works
All system Interlock circuits operate as one. This means that any open interlock switch
and/or Emergency Stop switch kills motion ability in all system electronics. Drive(s)
needed for media loading purposes are exempt from this requirement. Both System PCB's
contain the same Safety Interlock Circuit that functions as a single unit. However, an
over-current condition in the Drive circuit on one PCB can disable itself without the
knowledge/action of the other PCB's.
Emergency Stop Function:
There are three Emergency Stop buttons, one is located at the Operator Control Station,
and one at each end of the Gantry. The fourth Emergency Stop is the AC power Supply
Disconnect. Motion Motors that are disabled include the Gantry Drive, Carriage Drive,
Z-Axis Drive (Carriage up and down movement), all Ink and Maintenance Pumps,
Heaters, Table Vacuum Pump, and UV Lamps (not UV Cooling Fans).
Upon release (reset) of an Emergency Stop, no motion may be initiated without acknowl-
edgment of the Operator, i.e. User interface message on the LCD display with Operator
intervention acknowledgment. To re-activate the printer after you press an Emergency
Stop button, turn the button counter-clockwise. If the printer has encountered an error,
you must correct that error first. Errors are displayed on the LCD panel that is part of
the Control Station. When the error is corrected, release the Emergency-Stop button,
acknowledge the User interface message and continue printer operation.
Maintenance Station Interlock Function:
The Maintenance Station is located under the carriage and provides access to clean the
printheads. Carriage and Gantry motion motors are disabled and UV lamps are turned
off (if they were On), when the station sliding door is open. This includes the Gantry
Drive and Carriage Drive. Interlock system is automatically reset when sliding door is
closed. No User interface message with operator acknowledgment is required to re-enable
function of the printer.
34 Chapter 3 - Safety Information