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SECTION E. POWER SUPPLY UNIT E·, Section E. Power Supply Unit Description The 7715 power supply unit is a rack-mount module for use with Compumotor's range of brushless seIVO and stepping motor cb1ves. The unit accepts a s1ngle- or three-phase AC Snput and provides a single DC output voltage. Input and output are sent via connections to a motherboard. which 1s mounted on the rack and connected to the power supply. The motherboard also carnes the AC line fuses. two AC line suppression capadtoni. and a DC supply bleed resistor. AddiUonal circuitry Sn the power supply dumps power generated by the motor during deceleration. The max1mum power dump ratlng is 68 watts continuous. In hJgh duty cycle applications. this rating may need to be increased. Provisions have been made for the addition of an external dump reSistor (contact Compumotor for more information). The module can power up to three rack-mounted drtves. depending on the total maxfmum current demand. Adequate venUlation for the power supply unit should be provided. Rack-mounted systems usually require a cooling fan. depending on the max1rnum load. A built-in fan tray. With fans tnstalled as necessary. is an avallable option with the Compumotor-suppl1ed rack. Specifications Table E-l provides the specifications for the power supply unit. P.r.meter AC Input DC Output VA Rating SDeclfic.tlon 50 - 107V rms. single or three phase 70 -150VOC Single-phase input: 2200VA at 107V Three-phase input: 3400VA at 107V Max. Ambient Temperature 95°F (45OC) Power Dump Current 11Almaximum) Power Dump Rating 68 Watts continuous (provision for high-power external dump resistor if reQuired) Dimensions 3U!12HP Weight 2 Ibs (0.9 Kgs) Table E- i. Power Supply Specifications E-2 SYSTEM 7 USER GUIDE Fuse Ratings Table E-2l1sts the power supply module fuse ratings and types. Figure E-l shows the location of the fuses. In the event of a failure. use only the spec1fled fuse types for replacement. Fu •• Location R.tlng FS1 FS1 FS2 FS3 Power Supply Module PS Motherboard PS Motherboard PS Motherboard 2A llHB3Z mm Table E-2. Location & Ratings II II II C=::J PSI CJ II o II D II FS2 FS3 CJ 0 D II II II II II II II II II DD II FSI Figure E-l. Fuse LocaUon 25A OA HB 32 mm 25A OA HB 32 mm 2SA OA HB 32 mm SECTION E. POWER SUPPLY UNIT Installation E-3 The power supply module Is nonnally suppUed as part of a complete rack system. If this is not the case. and you are mounting the power supply separately. you should observe the following precautions: • • • • • Handle the unit With care. Install the unit in a clean. dry. well-ventilated area. Do not mount the unit on a hot surface. Do not mount the unit above a radiant heat source. The ctrculattng air must be free from steam. chemical substances, combustible vapors. and oil. Allow adequate venUlatlon above and below the rack. In some applications tnvolvtng high duty cycles. additional dump resistors may be needed as described earlier in this chapter. Connections You will need to make the following connections to the power supply module via the power supply motherboard. DC Output The DC output is taken via a pair of standoffs mounted on the power supply motherboard. Normally. the connection. between the power npply aDd the rack-mounted modulea are done for ,.au. AC Input The AC input to the power supply unit may be either slngle- or three-phase. Connection should be made between the power supply motherboard and the isolating transformer in accordance with the Instructions in Section D. Isolating Transjonner. When m.aJcinQ connections between the power supp~ and the fsolatinQ ~ormer ,or drWe modrclls. be sure to use the app apr iat.e JIClUIIe t6wire. HV Supply Indicator A single green LED illuminates on the front panel to Indicate the presence of the HV supply. SYSTEM 7 USER GUIDE E·4 Figures E-2 and E-3 show the c1rcult diagrams of the power supply unit and its motherboard. Principles of Operation The AC input is rect1fled by the two bridges BRI and BR2 and smoothed by capadtors C 1 - C4. to provide the main HV supply. Additional smoothing is provided by capacitors mounted on the drive motherboards. When HV is present. the front panel LED w1ll1llum1nate. The power dump circuit will remain operative if one of the input fuses fails wl)en a three· phase supply is used. The remainder of the drcwtry absorbs power generated by the motor while It IS deceleration. Dur1ng deceleration. the motor generates power that causes the HV voltage to rise. If the HV voltage rises above the reference voltage (158V). the power dump drewt will be turned on and current will flow through the dump resistors (R8 • Rll) until HV is restored to its nominal value. The dump fuse. FSI. IS included to protect the dump resistors and the circuit from over-dissipation. If this fuse is blown and Is nOlt replaced. the driVe may be damaged. When the AC power is switched off. the dump circu1t becomes operative. redUCing the HV supply to about 30V Within 5 seconds. FS, 210 32 mmTl HS , ~........_ 0 AC' C---~----~'-~----~ D..M' CIRCUIT AC2 C3 C1 C. C2 32w Con_. ~.., HI! SUPPl V ON LED AC3 32 o0 FJgure E-2. Power Supply Circuit Diagram ... OUUP RES 2 SECTrON E. POWER SUPPLY UNIT E-5 FSI 25A 32 mm QA ~ LI O~""I-cI-CQ..~~---...t==~r FS2 2SA 32 mm QA He L2 _----G C2 32 . .y ConrwClOf RI22IInZW fN DUMP RES I _===~ o [)IMP RES 2 - - - - 0 0 L3 FS3 25A 32 mm QA He Figure E-3. Power Supply Motherboard C1TCutt Diagram Summary You should now have an understanding of the operation of the power supply circuit. You should be able to adjust the isolating transformer tappings to suit your supply voltage and to provIde the required output voltage. If a fault occurs. refer to Section K. Maintenance & Troubleshooting.