Daktronics H-2024-9, Installation And Maintenance Manual

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SCOREBOARD HOIST/SUSPENSION
SYSTEM SPECIFICATIONS
Vern Voelzke Sr. Mechanical Engineer Daktronics, Inc.
The objective of these specifications is to design to single component failure prevention principles. This means
that the system has been analyzed for reasonable failure possibilities and a means of backing up the possible
failing component is designed into the system. It is the responsibility of the owner to assure that the system and its
integration into the building structure composes a thoroughly designed and adequately engineered system to
support all anticipated static and dynamic loads.
GENERAL SPECIFICATIONS:
n Shall be designed to carry the scoreboard load 100 % of the time.
n Shall have automatic failure-protection overspeed brake on each of the drums to slow and stop the load
with a maximum impact of 150% of rated load.
n Shall automatically disable hoist motor functions when an overspeed condition is detected.
n Shall have Key ways designed to eliminate possibility of keys walking or escaping.
n Shall have reeving of lifting cables with maximum of two degree fleet angle.
n Shall have 8:1 f.o.s. (factor of safety) on any single leg of a reeved cable.
n Shall have hoist, sheave, cable, and drum suspension connections with 8:1 f.o.s. to to average pick point load.
n Shall have gear shaft couplings with 8:1 f.o.s. at full load.
n Shall have worm reducer with little to no backwinding, manufactured to AGMA specification,
rated to support the scoreboard at a service factor of 1.
n Shall have lifting speed range of 5-9 fpm.
n Shall have two separate cables per pick point on two pick point systems.
n Shall have integral motor disc brake rated in excess of 150% of full load motor torque.
n Shall have hoist, sheave, cable and drum suspension connections with 8:1 f.o.s. to design weight.
n Shall have usage timer.
CONTROL SPECIFICATIONS:
n Shall have single starter operation with EMERGENCY stop circuit.
n Shall have anti motor bumping protection to eliminate bouncing.
n Shall have scoreboard elevation indicator.
n Shall have operational audible warning signal that activates when power is on at control station.
n Shall have key lock remote pendent with “UP”-”DOWN” momentary push buttons and “E”-stop button.
Hoist mounted control cabinet to have duplicate buttons.
n Shall have protection to assure continued control in the event that a contactor would fuse together.
n Shall have adjustable motor over current protection.
n Shall have “drop-out” line contactor activated by e-stop circuit and all ultimate (secondary) limit switches.
n Shall have secure, independent EMERGENCY stop circuit to drop out line contactor.
n Shall have independent (redundant) “Ultimate UP” or extreme cable wrap condition limit switches.
n Shall have six possible settings: up, down and four intermediate.
n Shall have failsafe and self-diagnostic control system.
n Shall have security system that can permit only authorized and trained personnel to change the operating
parameters of the system.
® Daktronics, Inc.
P.O. Box 5128 331 32nd Avenue Brookings, SD 57006
Phone (605) 697-4300 or (888) 325-8766 Fax 697-4700
www.daktronics.com e-mail sales@daktronics.com
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Copyright © 1999-2001 Daktronics, Inc. SL011801-3610