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Installation • OEM750
32
Choosing a Power Supply
The next table contains power ratings to help you choose a
power supply. Combinations of motors and current levels
other than those shown may result in power values that are
not recommended.
Motor Size Peak Motor Heat +
(@75VDC) Motor Avg. Shaft Drive Supply
Size 23 Current Power Heat Total**
OS2HA S (OEM57-40 S) 2.65A 56 Watts 9 Watts 65 Watts
OS2HA P (OEM57-40 P) 5.3A 56 Watts 19 Watts 75 Watts
OS21A S (OEM57-51 S) 3.3A 75 Watts 11 Watts 86 Watts
OS21A P (OEM57-51 P) 6.6A 75 Watts 25 Watts 100 Watts
OS22A S (OEM57-83 S) 3.8A 86 Watts 13 Watts 99 Watts
OS22A P (OEM57-83 P) 7.5A 86 Watts 31 Watts 117 Watts
Size 34
RS31B P (OEM83-62)* 4.4A 113 Watts 15 Watts 128 Watts
RS32B P (OEM83-93)* 5.6A 133 Watts 20 Watts 153 Watts
RS33B P (OEM83-135)* 6.9A 155 Watts 27 Watts 182 Watts
S: Series Configuration P: Parallel Configuration
*OEM83 motors are wired internally in parallel
** User must supply this level of wattage
Use the following equation to determine drive heat.
Drive Heat
(Watts) = (0.31) (I
M
2
) + (1.13 I
M
) + 3 I
M
=
Motor Current
Conversions
• To convert watts to horsepower, divide by 746
• To convert watts to BTU/hour, multiply by 3.413
• To convert watts to BTU/minute, multiply by 0.0569
SERIES AND PARALLEL WIRING
Compumotor OS motors may be configured in parallel or
series. Refer to the Quick Test section at the beginning of this
chapter for wiring instructions.
MOTOR TYPE
Compumotor’s OS and RS Series motors are custom-made for
use with the OEM750/OEM750X. These motors are not
available as a standard model from any other manufacturer.
They are designed for low loss at rest and at high speed.
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