Static Phase Converter Application
Notes
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1. WHAT TYPE OF CONVERTER
SHOULD BE USED?
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The most important question is whether or
not the motor is heavily loaded. You must keep in mind the
fact that the motor will produce approximately 2/3 of its
rated horsepower when running on the static converter. If
the motor is loaded beyond that point, you must use our Rotary
Converter, or use method
number 2 as explained in the Installation
Instructions. Otherwise, you must unload the motor by
reducing the motor pulley diameter by 1/3, or increase the
motor horsepower size by 50% to accommodate the loss of
power.
For further information or verification of
proper sizing, contact Phase-A-Matic, Inc. |
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NOTE: For the following
outlined applications you MUST use a Rotary
Converter:
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| Battery Charger |
Plasma Cutter |
Some CNC Equipment |
| EDM Machine |
Radar |
Transmitter (Radio
& Television) |
| Heating Elements |
Rectifier |
Variable Frequency Drive |
| Laser |
Rheostat |
Welder |
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| 2. REGULAR OR HEAVY DUTY SERIES? |
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Next you must determine whether to use a Regular
Duty or Heavy Duty converter. Keep in mind you can always use a
Heavy Duty converter in place of a Regular Duty one. A Heavy Duty
converter will not provide greater horsepower. However, there are some
static converter applications for which you should
always use the Heavy Duty series. |
| These are: |
| 1. |
Frequent starting
(more than once a minute).
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| 2. |
Instant reversing.
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| 3. |
Unattended equipment,
such as air compressors.
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| 4. |
Long, heavy starting cycles, such as lathes
without a clutch, flywheel driven equipment, etc.
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| 5. |
If jogging is
required.
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| 6. |
If there is a chance of the motor being
stalled during use (woodworking equipment, etc.).
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| 3. WHAT HORSEPOWER RANGE
CONVERTER SHOULD BE USED? |
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Next, you must find the proper horsepower
range for the application. The largest motor on the
machine, or idler motor if used, must fall within the
minimum and maximum ranges of the converter. Two speed
motors are usually dual horsepower. For example, a 3
horsepower 3600 RPM motor is 1-1/2 horsepower at 1800 RPM.
You should select a converter with a minimum and maximum
range which will accommodate both horsepower ratings. However,
with Taiwanese and Chinese motors, the larger horsepower
should be at the lower range of the converter whether it
is a two speed motor or not. For example, for a 5
horsepower Taiwanese motor you should use a 4-8 horsepower
range converter, even if it is a two speed motor with
2-1/2 horsepower on the low speed. This is because
Taiwanese and Chinese motors draw more amperage during
start than do domestic motors and therefore require a
slightly larger converter than would normally be used. A
larger size converter will not provide greater horsepower.
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| A Few Additional Items to
Remember: |
| 1. |
The first motor to start on the
converter must fall within the minimum and maximum
horsepower range on the converter. However, after the
first motor has started, motors below the minimum range
may be started and can usually be left running as the
main motor is stopped and started. |
| 2. |
Do not add the horsepower of the power
feed, coolant pump, or other accessory motors when
sizing a converter. The only time you would add the
horsepower of two or more motors together would be if
they always start at exactly the same time. |
| 3. |
A larger size converter or a Heavy Duty
series converter will not produce greater horsepower
than a Regular Duty converter. |
| 4. |
Heavily loaded equipment usually
consists of equipment with pumps, blowers, fans,
compressors, etc. |
| 5. |
If further technical assistance is
required, contact Phase-A-Matic, Inc. for
assistance at 661-947-8485. Our business hours are
Monday through Friday 8:00 AM to 4:30 PM Pacific Time.
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