Museum Technology Source 4321 Count Down Timer - Manual (Page 2)

4321 Count Down Timer
Technical Specifications
Display
Time Range
Operating Modes
Start Input
Relay Output
Display Connection
Power
Controls
Display Physical
Control Physical
Included Accessories
Optional Accessories
Two digit, 4 inch high LED. Red standard; green available
1 to 99 minutes in 1 minute increments
a) counts down continuously; upon reaching zero reverts to
present number and starts counting down again. b) counts
down as long as contact is maintained across start terminals.
c)Starts counting upon momentary contact across start terminals.
d) same as (c) but if momentary contact while counting will
cause display to revert to preset count
Optoisolated input. Start switch must be capable of switching
12 VDC @20mA. Screw terminals on plugable block
SPDT relay rated at 2 Amps, 24 VDC. Activates for 1 second.
three screw terminals on plugable block
4 wires; 2 for RS-485 data; 2 for 12 VDC power @ 700mA
Supplied 15 VDC 900 mA external power supply. Sufficient for
control unit and one display; multiple displays require addition-
al power
Front panel Run/ Set toggle. In Set mode, Increment pushbut-
ton is held until desired time is indicated on 2 digit display con-
trol unit. Toggle in Run position enables normal operation.
Front panel display reads same as remote display. Two LED’s
indicate status
Display is mounted on 9.4”x7.1” metal plate which is attached to
13.5” x 9.5” red Plexiglas drilled with 4 countersunk holes for
mounting to exhibit surface. Weight 3 lbs.
1.5” high x 5.5” wide x 9.0” deep. Weight 3 lbs.
Power supply, 20 foot 4 conductor interconnect cable
RK-3 Rack Mount Kit; additional display units.
Rear Panel View of Control Unit
323 Andover Street Wilmington, MA, 01887
800-729-6873 / 978-657-3898 Fax: 978-657-7132
www.museumtech.com / [email protected]