Users Manual Chapter 5

100 Thor VM3A Vehicle-Mounted Computer
Screen Blanking Installation
Screen blanking (blackout) can be enabled when the vehicle is in motion. Once
screen blanking is enabled, the display is blanked out (or a preselected zoom area
is displayed) any time when the cable sends the signal that the vehicle is in motion.
If the cable is removed, screen blanking is disabled and the display remains on.
Prerequisite: The steps outlined in either 12-48 VDC Vehicles (10-60 VDC Direct
Connection), 60-144 VDC Vehicles (50-150 VDC Power Supply, Screws on Side of
Lid) or 60-144 VDC Vehicles (50-150 VDC Power Supply, Screws on Top of Lid)
have been completed.
Screen blanking is accomplished by either a Screen Blanking Box or a user sup-
plied switch.
Fuse Requirements for Screen Blanking
Note: For North America, a UL Listed fuse is to be used. The fuse and the fuse holder must
be supplied by the user.
Screen Blanking Cable
Refer to Screen Blanking to configure the VM3A for screen blanking.
When routing any additional cables for screen blanking:
• Route the cable the shortest way possible removing any left-over cable
• Route the cables so they are protected from physical damage and from surfaces
that might exceed the cable's rated temperature threshold.
• Cable should be protected from physical damage from moving parts
• Do not expose the cable to chemicals or oil that may cause the wiring insulation
to deteriorate
• Always route the cable so that it does not interfere with safe operation and
maintenance of the vehicle.
• Provide mechanical support for the cable by securing it to the vehicle structure
at approximately one foot intervals, taking care not to over tighten and pinch
conductors or penetrate outer cable jacket.
Honeywell Screen Blanking Box Cable
An optional Honeywell Screen Blanking Box Cable is available (VM1080CABLE).
Caution: For installation by trained service personnel only.
Warning: For proper and safe installation, the input power lead to the
Screen Blanking Box requires a 3 Amp maximum time delay
(slow blow) high interrupting rating fuse.