Application Specifications

• Interior and exterior surface of frame painted with epoxy enamel
• Armature and shaft (except shaft extension) painted with epoxy enamel
• Stainless steel or neoprene slinger mounted on external shaft extensions
• External fan on TEFC motors is plastic or epoxy coated cast iron
• Fan cover on TEFC motors is finished with epoxy enamel
• Automatic breather drains provided a positive drain, on totally enclosed motors
• Assembled motor with mounted accessories painted with epoxy enamel
• Conduit box - Neoprene gaskets on cover and box to frame. Box construction is :
  • C180ATZ - C360ATZ - Epoxy coated cast iron with pipe tap lead outlet
  • C400ATZ - Epoxy coated mill type
  • B500ATZ - B1600 - Epoxy coated mill type with pipe flanges for conduit thread connection
  Optional at additional cost -
  • MOD 172 - Mill type for Frames C180ATZ - C360ATZ
  • MOD 174 - Oversize mill type for Frames C400ATZ - B960AT
• Bracket to frame rabbet fit sealed with special sealing compound
• Two transparent handhole covers sealed with neoprene gaskets
• All hardware corrosion resistant
• Stainless steel nameplate
• All external bolt heads sealed, includes bearing cap bolts, main field pole and interpole bolts
• Unused lifting eye bolt holes sealed, Frames C180ATZ - C360ATZ
• Special brush grade to provide more cleaning action for paper mill environments (when required, usually on lower horsepower ratings)
• Shaft grounding brush minimizes bearing failure from circulating shaft currents
• Splash-Proof Covers
• Thermostat

• MOD 280 - Space heaters (or fields energized at 50% voltage)
• Motor accessories, such as, brakes to be priced and specified as totally enclosed (Add space heaters on brakes)

These Motors are designed for Metal Rolling Mill Service (Except Reversing Hot Mill) and meet the requirements of NEMA MG1-23.02

• Temperature Rise According to MG1-23.40

• Overload Capability is in accordance with NEMA MG 1-23.41.2 for Metal Rolling Mill Service Motors. The motors are capable of carrying, with successful commutation, the Following Loads:

1. 115 percent of rated horsepower load continuously at rated voltage throughout the rated speed range. Under this load, the temperature rises will be higher and other characteristics may differ from those specified for operation under rated conditions.
2. 125 percent of rated horsepower load for 2 hours at rated voltage throughout the rated speed range, following continuous operation at rated load, without exceeding the temperature rises specified in MG 1-23.40 above.
3. The Following Momentary (one minute) Loads:

Designed to operate at a common speed from a common DC Supply while load sharing in proportion to rating.

• Criteria:

1. Load share in proportion to rating
2. Operate in both motoring and regenerative modes with stabilizing winding not reversed
3. Operate with 15% field weakening at no load
4. Final load sharing by adding trim resistors in armature circuit

Looper motor must withstand full load armature current at zero speed and near zero speed continuously. The armature current must be reduced for this application, resulting in over framed motors.

The designation "Winder Duty" has evolved as a result of the need to provided very wide speed ranges (by field control) where the load and time at the highest speed is limited and predictable.

Originally, attempts were made to use only certain base speeds and "winder" speeds, but the diversity of applications required the use of the term "Winder Duty" for various base speeds and speed ranges.

Specifically, "Winder Duty" means that at the "Winder" speed or "Winder" RPM, the motor is limited to 100% load (armature current) and one minute duty. At lower speeds ("maximum continuous RPM" and below), the normal NEMA ratings of 100% load, continuous duty; and 150% load (armature current), one minute duty are applicable.

NOTE: there is NO peak overload capability (beyond (100%) at the winder speed.

3-50 HP, Splash-Proof Guarded, Continuous Duty, 40?C Ambient, 1.0 Service Factor, Class F Insulation, Stabilized Shunt Wound, Power Code C, 240 V Armature ? 240 V Field, Provision for Adding Flange Mounted Tachometer, Thermostat

• Range Drive Motors have matched IR drops within approximately 5 Volts and good regulation characteristics out to the maximum field weakened speed of 2300 RPM.
• Capable of operation at 25% Base Speed with 67% armature current and motor field pre-weakened to 2100 RPM.
• Specially designed for use on multi-motor drives operating on a common voltage power supply such as Textile Range Drives, Roofing Machines, Tube Mills, etc.

• A Definite purpose design for the plastics industry
• Reduced user maintenance and improved reliability
• Prevents contamination from reaching commutator and brushes
• Motor Features:

1. Enclosed commutator design duplicates brushlife performance of non-vent machines
2. Lexan cover is standard
3. Disposable furnace type filter
4. Class B temperature rise armature
5. 100 to 1 constant torque speed range
6. PLS bearing lubrication
7. Warning and high limit thermostats

• One Year Brush Life Guarantee
• Ratings Available:

1. 10 to 400 HP at 1750 RPM are stocked
2. 10 to 350 HP at 1150 RPM are pre-engineered

Reliance has received a number of requests for replacement spindle motors. Sometimes the request is to replace an existing motor made by Reliance or another manufacture. Sometimes the machine is being rebuilt and has a new mission, which requires a new motor rating. When a new rating is required, the rebuilder occasionally asks for help in sizing the new motor. In either case, the drive may be the original or a replacement. It is important to know what drive is being used since the drive power code will affect motor sizing.

When the specification is this complete, quoting a replacement is very easy. When the specification is not this complete, quoting a replacement is risky.

If the machine has a new mission, knowing that mission will allow us to calculate the required horsepower using the formula and table below.

Before we calculate horsepower, lets review a few basics. A lathe starts a cut at maximum diameter and slow speed. Speed increases, up to a point, as the diameter decreases. Speed is then held constant at some maximum speed and the cut is finished. This is done since speed could increase to infinity at zero diameter. We then have a constant horsepower requirement throughout most of the speed range. Gears are used to change speed ranges. The torque required to cut metal varies with the metal being cut. It takes about five times as much torque to cut steel as it does to cut aluminum. Aluminum however, can be cut at a speed 10 times faster than that used to cut steel. Aluminum is cut at about 2,000 surface feet per minute and steel is cut at about 200 surface feet per minute. Thus the horsepower required to cut aluminum is twice the horsepower required to cut steel.

HP = Q x P
HP = spindle drive motor horsepower when machine is 80% ?
P = unit power factor or constant from the below chart
Q = rate of metal removal in cubic inches per minute
	Q = F x W x D
	F = feed rate, inches per minute
	W = width of cut, inches
	D = depth of cut, inches

Example:	Q = 28 cu in/min
	P = 1.4 factor for cast steel, dull tool, 200 Brinell, 14 Rockwell C
	HP = Q x P = 28 x 1.4 = 39.2

Note: A Brinell, Rockwell C and Rockwell B hardness comparison chart can be found in the Engineering Information section of the Dodge catalog.