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Series 1999SEMC Semelex® Safetimeter
6380 Brockway Rd, Peck, Michigan 48466 • Phone: 248-435-0700
1.2: Theory of Operation
The P/V transducer measures the open height of a press. When this measurement coincides with the preset CSP
position, and the ram is traveling in the direction selected on the TIME UP/TIME DOWN switch, the Auto-Hand will
release one of the two run controls or press an E-STOP control to initiate the press stop. When the ram stops, the P/V
transducer sends a stop signal to the Safetimeter and the meter displays either stop time or safety distance, whichever
display mode was selected prior to the test.
NOTE: No OSHA standard exists for defining when a press has stopped (at what ram velocity). The Safetimeter ends its
measurement when the ram velocity is approximately .17 inches per second (10 inches per minute). When measuring
stop time, you must take into account all elements and devices used to bring the ram to rest. These include the “flight
time” of the run and E-STOP buttons (time for switch to activate), control relays, solenoids valves and clutch and brake
mechanical elements. Where an electronic guard (light curtain) is used, response time of the device and the depth
penetration factor must be added to that measured by the Safetimeter before calculating safety distance. Response
time is generally stated by manufacturers of electronic guards. However, to verify systems, the Auto-Flag can be used.
Chapter 2: Unpack & Set-up
The Series 1999 Semelex II Safetimeter has been carefully inspected and tested before shipment. Unpack the unit
and perform a visual inspection to assure that no damage has occurred during shipping. If damage is found, notify
the transportation company immediately. Only the consignee may institute a claim with the carrier for damage during
shipment.
2.1: Set-Up and Test
1. The Safetimeter battery is shipped with a partial charge. Plug in the unit and charge the battery until the green LED
goes off (maximum charge time is eight (8) hours).
2. Connect the P/V transducer with the appropriate connector.
3. Connect the Auto-Hand cable to the controller.
4. Make the following Safetimeter switch settings:
Display
SAFETY DISTANCE (IN)
Revolution
PART REV
Timing Direction
TIME DOWN
Control Start Point (CSP) 200 (20.0 inches)
5. Push the ON/OFF switch ON.
6. Place the P/V transducer on a metal desk or steel plate. The magnetic base will hold the unit in place.
7. Carefully slide the cable magnet from its keeper. Do not let the cable run free, it can be damaged by impact from
sudden release. Pull the cable magnet out approximately 24 inches.
8. Bring the magnet back towards the P/V transducer. The P/V transducer will reel in the cable automatically. When
the cable magnet is about 20 inches from the base of the P/V transducer, the Safetimeter will send a command to
the Auto-Hand and the controller will start counting. The unit will continue counting as long as the cable velocity
is .17 inch per second (10 inches/minute) or greater.
