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Application Guide

ManualsBrandsHoneywell ManualsHVAC SuppliesSmart VFD HVAC Variable Frequency Drive, 208/230V, 2 HP, NEMA 1, Drive Alone
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63-70627
Spindle Drive DC Drive
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Honeywel
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General Purpose
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Honeywel
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Honeywel
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Honeywel
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Vector Drive
Universal Drive
Fig. 3. Universal Drive.
MOTOR FUNDAMENTALS
Three-phase electric motors are very rugged machines that have to withstand almost endless abuse from end users and still
continue to perform to specification. There are several variables of which the end user is often unaware. Many have significant
effect on the general performance of the motor. The motor terminal voltage is a major variable that can have significant effect
on the performance of the motor. Table 1 shows the effects of raising and lowering the motor terminal voltage, about its
nameplate value. The power supply feeding the majority of domestic facilities is nominally 200 Vac 1 Phase and nominally 400
Vac three-phase for commercial and industrial applications. This power is transmitted at a frequency of 60 Hz. The vast
majority of motors in industry and commerce are three-phase induction motors of the Squirrel Cage Design.
Table 1. AC Motors: Voltage Variation Effects (Constant Frequency).
90% Rated Voltage 110% Rated Voltage
Torque (Varies directly as Square of Voltage) -19% +21%
Speed, Synchronous No Change No Change
Speed, Full Load (Induction Motors) -1.5% +1%
Current, Starting -10 to -12% +10 to +12%
Current, Full Load +11% -7%
Slip +23% -17%
Efficiency -2% +½ to +1%
Power Factor +1% -3%
Advantages
— Long life.
— High protection levels available.
— High efficiency: 80%+.
— Readily available replacements world-wide.
— Minimal moving parts therefore low maintenance cost.
— High starting torque, suitable for wide variations of applications.
— Simple to reverse.
— Low cost.
Disadvantages
— Designed for fixed speed operation.
— Designed to be run from sine wave power supply.