339-0083-000 5-2005 Electronic Capacity Control - Milton Roy Company - #29

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d)Tool kit2. Preparation:a)All new components should be replaced.b)Insure pump is set to 0% setting. c)Remove AC power.d)Remove cover from ECC. 4.8.1.1 Calibration A Calibration A is performed to synchronize the ECCwith the pump. Calibration A is performed when:•Replacing any components in the position feedback assembly. This includes the nylon worm gear/driver, the potentiometer, and/or the potentiometer gear.•Adding or removing reverse action jump-ers (Section 3). 1. Tools needed for calibration A:a)Digital volt meter (DVM) or equivalent withresistance, 5 VDC, and 20 mA.b)4-20 mA (1-5 VDC) source and 115 or 220VAC sourcec)Precision screwdriver to adjust potentiom-eters VOLTAGE SELECTOR SWITCH SW1LOCATED ON TOP OF THE CIRCUIT BOARD MUST BE SET TO THE VOLT-AGE LISTED ON YOUR DATA PLATE(FIGURES 1 OR 2), OR DAMAGE TO MOTOR WILL RESULT. e)Ensure voltage selector switch is set to 115VAC or 230VAC as indicated on data plate (Section 2). f)If circuit board has been replaced ensureDIP switches SW2 and SW3 are set asneeded for proper operation (Section 2).g)Remove ECC from pump.3. Remove PCB (Paragraph 4.4.1) to gain accessto feedback potentiometer.4. Remove P2 and connect DVM between P2 pin1 and P2 pin 2 (Figure 14). Loosen screws topotentiometer to allow movement of potentiom-eter gear without moving nylon worm gear. Setpotentiometer to 1.5K ohms ±100 ohms for Mil-royal B, C, and Macroys, 0.87 ohms ±0.1 ohms for mRoys and 1.3 ohms ±0.1 ohms for Maxroys and Milroyal D ECCs and re-tighten potentiometer screws. This sets the resistance of the potentiometer. 5. Install PCB (Paragraph 4.4.2) and performremaining adjustments. Figure 14. Potentiometer Connector P2 Pins 1 and 2 21 There are three levels of calibration that can beperformed. Use the appropriate calibration routine for your requirement. For all routines, referenceFigure 10.