Other Information, Fine Tune Alignment | Bosch Power Tools DS241

7.3 Fine Tune Alignment

•Connect the supplied TC2000 Test Cable to Pins 1, 2 and 3 of P6, the group of pins located just to the right of the receiver’s terminal strip (see Figure 14).

•An alarm test may be performed here if desired by connecting the white and black wires of the TC2000. To reset the unit, temporarily remove power.

•Press the receiver’s Set-up button located just below the P6/test cable connection (see Figure 15). Press only if the covers are on both transmitter and receiver.

Figure 14 - TC2000 Connection

-Temporarily disconnect the Remote Indicator Plate connector, if installed.

•Connect a 20,000 Ohm/volt (or greater) DC VOM to the black

(–) and red (+) leads of the TC2000.

-Set meter scale so that readings of 0.0 to 5.0 VDC can be read.

•Check the three LEDs on the receiver.

-If the beam is being received by the receiver, the green LED should be flashing, and the red and yellow LEDs should be on steady.

-If the green LED is on steady, the beam is not reaching the receiver. If this is the case, the preliminary alignment proce- dure should be attempted again.

•Observe the meter readings and adjust the receiver’s optical module using the Horizontal and Vertical Fine Tuning adjustment screws for a maximum reading on the meter. This is the most critical process of alignment. For the most effective operation of this system, the peak voltage during fine tune alignment must be obtained.

NOTE: When performing fine tune alignment, keep arms and hands away from the front of the receiver and out of the beam path.

•The maximum voltage peaked reading will vary depending on the distance between the transmitter and receiver. The acceptable peaked voltage range is 0.50 to 5.00 V. The voltage at the receiver is greater at shorter distances. It is very important to peak the voltage to insure a stable trouble free detector.

Hint: Make a note of the alignment voltage. It may be helpful if future troubleshooting is necessary.

•After completing the fine tune alignment, remove the test cable, then replace and secure the receiver's cover.

•Check the status of the receiver’s green LED. It should still be flashing.

•With the meter still connected to the test cable, re-install the test cable to P6 through the opening in the cover (red lead towards center of unit).

-This starts a one to two minute automatic internal setup process that results in a reference voltage for measuring beam blockages.

LEDs

Setup

Button

Figure 15 - The Receiver's Set-up Button

-The red and yellow LEDs should turn off, and the green LED will turn on steady. After some voltage fluctuations, the meter should settle at 5.0 VDC.

NOTE: Be careful not to block the beam or move the units during this time.

-At the end of the setup period, the receiver’s green LED will flash, and the voltage will drop to between 3.8 and 4.2 VDC. This is a reference voltage that later readings can be com- pared to when determining the need for cleaning.

•If the voltage is not between 3.8 VDC and 4.2 VDC, push the Set- up button again.

•After set-up is complete, remove the test cable (and reconnect the Remote Indicator Plate connector if used).

•Replace and secure the access door.

8.0Other Information

8.1Fire Alarm Reset

To reset the receiver after a fire alarm has occurred, remove power from the receiver for at least one second, then re-apply (see also, Section 8.4 Power Outage on page 7).

8.2 Cleaning

At least once a year, the outside of the covers should be cleaned with a common window cleaner and a soft, clean cloth. Under normal conditions, this should not result in a trouble alarm as long as the beam is not continuously blocked for more than 18 sec. After cleaning, recheck the reference voltage. If the voltage is less than 3.8 VDC, or greater than 4.2 VDC, calibrate the units (see Section 8.3 Reference Voltage Calibration).

8.3 Reference Voltage Calibration

The reference voltage of the detectors should be checked at least once a year (or more often if required by local regulations or authorities having jurisdiction). Clean covers are necessary for proper reference voltage readings.

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DS240/DS241 Installation Instructions

DS240, DS241 specifications

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