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5. Using an ohmmeter, perform the following resistance measurements and record the results: 5. Using quarter-turn increments, alternating between clamping bolts, apply the appropriate number of whole turns referencing the table in Fig. 43. 6. Reconnect the red (cathode) wire from the SCR and the white (anode-gate) wire to the appropriate location on the firing card (i.e., SCR1 wires to firing card terminal G1-white wire, and K1-red wire). SCR PAIRS BEING CHECKED 3 and 6 2 and 5 1 and 4 MEASURE BETWEEN T1 and T6 T2 and T4 T3 and T5 RECORDED VALUE If all measured values are greater than 5K ohms, proceed to Step 10. If any values are less than 5K ohms, one or more of the SCRs in that pair is shorted. 6. Remove both SCRs in the pair (See SCR Removal/ Installation). 7. Using an ohmmeter, measure the resistance (anode to cathode) of each SCR to determine which device has failed. NOTE: Both SCRs may be defective, but typically, only one is shorted. If both SCRs provide acceptable resistance measurements, proceed to Step 10. 8. Replace the defective SCR(s). 9. Retest the “pair” for resistance values indicated above. 10. On the right side of the firing card, measure the resistance between the red and white gate/cathode leads for each SCR (1 through 6). A measurement between 5 and 50 ohms is normal. Abnormally high values may indicate a failed gate for that SCR. 11. Replace the SCRs and retest the pair. SCR REMOVAL/INSTALLATION — Refer to Fig. 43. 1. Remove the SCR by loosening the clamping bolts on each side of the SCR, 2. After the SCR has been removed and the bus work is loose, apply a thin coat of either silicon based thermal joint compound or a joint compound for aluminum or copper wire connections to the contact surfaces of the re- placement SCR. This allows for improved heat dissipa- tion and electrical conductivity. 3. Place the SCR between the roll pins on the heatsink assemblies so the roll pins fit into the small holes in each side of the SCR. NOTE: Ensure the SCR is installed so the cathode side is the side from which the red wire extends. The heatsink is labeled to show the correct orientation. 4. Hand tighten the bolts until the SCR contacts the heatsink. 7. Reconnect all other wiring and bus work. 8. Return starter to normal operation. NUT CLAMPING BOLT ALUMINUM HEATSINK ROLL PIN SCR SCR PART NUMBER BISCR 6601218 6601818 8801230 8801830 15001850 15001850 220012100 330018500 A LOOSEN AND TIGHTEN BOLTS FROM THIS END BOLT LENGTH (in.) 3.0 (76 mm) 3.0 (76 mm) 3.5 (89 mm) 3.0 (89 mm) 4.0 (102 mm) 5.0 (127 mm) If any red or white SCR gate leads are removed from the firing card or an SCR, care must be taken to ensure the leads are replaced EXACTLY as they were (white wires to gates, and red wires to cathodes on both the firing card and SCR), or damage to the starter and/or motor may result. CLAMP SIZE A DIMENSION (in.) NO. OF TURNS 1030 2.75 (70 mm) 11/2 1030 2.75 (70 mm) 11/2 1035 2.75 (70 mm) 13/4 1035 2.75 (70 mm) 13/4 2040 4.00 (102 mm) 23/4 2050 4.00 (102 mm) 23/4 90 Care must be taken to prevent nut rotation while tightening the bolts. If the nut rotates while tighting the bolt, SCR replacement must be started over. Consult Benshaw Representative Consult Benshaw Representative Fig. 43 — SCR Installation Physical Data — Tables 13A-20 and Fig. 44-56 provide additional information on component weights, compressor fits and clearances, physical and electrical data, and wiring sche- matics for the operator’s convenience during troubleshooting.PDF Image | 19XR,XRV Hermetic Centrifugal Liquid Chillers 50/60 Hz With PIC II Controls and HFC-134a
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