ABB REL 301, Instruction Manual

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I.L. 40-386.3
(10/94) 5-15
• Monitor Relay Failure Indication
• Remotely test Output Relay (Trip, Close, etc.)
• Check for Failure Alarm via annunciator or network
• Change real-time clock battery. (See Figure 5-3 for location.) Use a lithium type bat-
tery such as Ray O’Vac #BR2016.
5.3.1.2 Using Man-Machine Interface
• Use the front display, and push-buttons to manually perform the tests described in
Section 5.3.1.1 above.
5.3.1.3 Routine Visual Inspection
With the exception of routine visual inspection, the REL 301/302 relay assembly
should be maintenance free for one year. A program of routine visual inspection
should include:
• Condition of cabinet or other housing
• Tightness of mounting hardware
• Proper seating of subassemblies
• Condition of external wiring
• Appearance of printed circuit boards and components
• Signs of overheating in equipment
5.3.1.4 Perform the Acceptance Test
Performing this test is optional if all other test results are acceptable.
5. 4. CALIBRATION
5.4.1 Pre-Calibration
NOTE: When the REL301/302 is being calibrated, move the jumper from JMP3
to JMP6 position on the Microprocessor Module. After calibration, re-
place the jumper back to the original JMP3 position.
Three trimpots (P17, P16, P15) are used to calibrate the A/D converter; a variable ca-
pacitor (C6) is used for clock adjustment
(see Figure 5-1). The REL301/302 relay has
been properly adjusted at the factory; adjustments by the user are not required. The
following Factory calibration procedure is for reference only.
1) Turn “OFF” all Vac and Vdc power.
2) Remove the cover and front panel by using a screw driver.
3) Connect together all terminals FT-1, 2, 3, 4, 12-19 through an external mating
connector.
4) Move jumper from JMP3 to JMP6.
5) Remove U6 (Sample/Hold device from its socket on Input/Filter Module.
6) Connect a digital voltmeter (with at least 5 digits) to TP3, and TP2 (common).