Rockford Fosgate DETECT-A-FINGER RKC-502 Installation Manual page 7

General Overview
The purpose of the Detect-A-Finger® Drop Probe Device is to effectively reduce accidents on applications where the
operator's fingers may enter the point of operation. The components of this system are a sensing probe shaped to fit
over or around the workpiece, a drop-probe assembly, and a control box. When the operator initiates a weld cycle,
the sensing probe is released and drops by gravity over or around the workpiece. If the operator's fingers are still in
the danger area, the sensing probe cannot reach its preset down position and the welder is prevented from cycling.
Conversely, if no obstruction prevents the sensing probe from dropping, then as soon as it reaches its preset down
position, the control unit will allow the welder to cycle.
The control unit is ruggedly built to assure continued successful operation under adverse operating conditions usually
found around this type of machinery. For additional safety, the control relay in the control unit (when properly wired into
the machine system) will prevent cycling of the machine accidentally or intentionally. This can be confirmed by moving
the sensing probe manually without actuating the operating means.
Components in the System
• Control box
• Drop-probe assembly
• Sensing probe (2)—to be formed by user
• Sensing probe clamp
• Danger signs
Additional components that may be required
• Disconnect switch
• Transformer
• Lockout valve
• Foot switch
Specifications
Detect-a-Finger
Input voltage ......................................................................................................................... 115 + 15% VAC, 50/60Hz
Operating current ................................................................................................................................. 0.6 Amps typical
Weight .......................................................................................................................................................approx. 8.5 lb
Input voltage ........................................................................................................................... 24 + 15% VAC, 50/60Hz
Operating current ................................................................................................................................. 3.0 Amps typical
Duty cycle ...................................................................................................25% (10-second max. continuous on-time)
Stroke .................................................................................................................................. 1.63 (1
Mechanical life ................................................................................................. Rotary solenoid–100 million operations
Weight .......................................................................................................................................................approx. 3.5 lb
Wire size ............................................................................................................................... .156 dia. x 18 inches long
Material ...................................................................................................................................Aluminum rod (standard)
Total weight ................................................................................................................... approx.0.5 lb (probe and clamp)
Rockford Systems, LLC
Call 1-800-922-7533
For mechanically operated welders:
• Air cylinder assembly
• Solenoid air valve
• Air filter-regulator-guage and lubricator assembly
®
Assembly—RKC-500
CONTROL BOX
SECTION 1—IN GENERAL
Detect-A-Finger Drop Probe Device-Welder
®
SENSING PROBE ASSEMBLY
SENSING PROBE (UNFORMED)
(supplied from control box)
⁄ ) inches maximum
5
8
7