Carrier 17 Start Up & Operation Manual

Contents

The test voltage, based on the motor operating voltage, isas follows:Operating Voltage DC Test Voltage0- 900 500901- 7000 10007001-14500 2500This is particularly important if the motor may have beenexposed to excessive dampness either during transit or whilein storage. A ‘‘megger’’ type instrument can be used to mea-sure the insulation resistance. The test voltage should be ap-plied between the entire winding (all winding leads connectedtogether) and ground for approximately one minute with thewinding at ambient temperature. The recommended mini-mum insulation resistance is determined as follows:RM = KV + 1WhereRM = Recommended minimum insulation resis-tance in megohms at 104° F (40° C) of theentire winding.KV = Rated motor terminal to terminal voltage inkilovolts (1000 volts = 1 KV).On a new winding, where the contaminant causing lowinsulation resistance is generally moisture, drying the wind-ing through the proper application of heat will normally in-crease the insulation resistance to an acceptable level. Thefollowing are several accepted methods for applying heat toa winding:1. If the motor is equipped with space heaters, they can beenergized to heat the winding.2. Direct current (as from a welder) can be passed throughthe winding. The total current should not exceed approxi-mately 50% of rated full load current. If the motor hasonly 3 leads, 2 must be connected together to form onecircuit through the winding. In this case, one phase willcarry the full applied current and each of the others, one-half each. If the motor has 6 leads (3 mains and 3 neu-trals), the 3 phases should be connected into one seriescircuit.3. Heated air can be either blown directly into the motor orinto a temporary enclosure surrounding the motor. Thesource of heated air should preferably be electrical as op-posed to fueled (such as kerosene) where a malfunctionof the fuel burner could result in carbon entering the mo-tor. Caution must be exercised, when heating the motorwith any source of heat other than self contained spaceheaters, to raise the winding temperature at a gradual rateto allow any entrapped moisture to vaporize and escapewithout rupturing the insulation. The entire heating cycleshould extend over 15 to 20 hours.Insulation resistance measurements can be made while thewinding is being heated. However, they must be corrected to104 F (40 C) for evaluation since the actual insulation re-sistance will decrease with increasing temperature. As an ap-proximation for a new winding, the insulation resistance willapproximately halve for each 18° F (10° C) increase in in-sulation temperature above the dew point temperature.Open-Drive Motor Pre-Start Checks — To pre-vent damage to the motor, the following steps must be takenprior to initial start-up:1. Remove the shaft shipping brace (if supplied).2. For sleeve bearing motors, the oil reservoir must be filledwith oil to the correct level. The proper oil is a rust andoxidation inhibited, turbine grade oil. The viscosity of theoil must be 32 ISO (150 SSU) at 100 F (37.7 C). Oil ca-pacity in each of the two bearings is 0.6 gal. (2.3 L) perbearing. Use of Carrier Oil Specification PP16-0 is ap-proved (Mobil DTE Light or Sun Oil SUNVIS 916).3. If possible, the shaft should be turned over by hand toensure that there is free rotation. On sleeve bearing mo-tors, the shaft should be moved to both extremes of itsend play while it is being rotated, and the oil rings shouldbe viewed through the viewing ports in the top of the bear-ing housing to verify free ring rotation.4. On fan-cooled motors, the area around he external faninlet should be checked for loose debris that could be drawninto the fan during operation.5. All external, factory-made, bolted joints should be checkedfor any looseness that may have occurred in transit. Referto Table 6 for recommended bolt torques.Table 6 — Recommended TorqueBolt size 1⁄4( 5⁄ 16( 3 ⁄8( 1 ⁄2( 5⁄ 8( 3⁄ 4( 7⁄ 8( 1( 1 1⁄ 3( 1 1⁄ 2(Grade SAE GR 5Torque* Ft-lbs 3.5 7 12 31 63 115 180 275 550 960N.m 4.7 9.5 16 42 85 156 244 373 746 1302Bolt size M4 M6 M8 M10 M12 M10 M12 M16Grade DIN 8.8 DIN 12.9Torque* Ft-lbs 2 8 15 35 65 45 92 225N.m 2.7 11 20 47 88 61 125 305*Torque values based upon dry friction.Carrier Comfort Network Interface — The CarrierComfort Network (CCN) communication bus wiring is sup-plied and installed by the electrical contractor. It consists ofshielded, 3-conductor cable with drain wire.The system elements are connected to the communicationbus in a daisy chain arrangement. The positive pin of eachsystem element communication connector must be wired tothe positive pins of the system element on either side of it;the negative pins must be wired to the negative pins; the sig-nal ground pins must be wired to signal ground pins.To attach the CCN communication bus wiring, refer tothe certified drawings and wiring diagrams. The wire is in-serted into the CCN communications plug (COMM1) on thePSIO module. This plug also is referred to as J5.NOTE: Conductors and drain wire must be 20 AWG (Ameri-can Wire Gage) minimum stranded, tinned copper. Indi-vidual conductors must be insulated with PVC, PVC/nylon,vinyl, Teflon, or polyethylene. An aluminum/polyester 100%foil shield and an outer jacket of PVC, PVC/nylon, chromevinyl or Teflon with a minimum operating temperature rangeof –20 C to 60 C is required. See table below for cables thatmeet the requirements.53