Table 5.1 Motor Power Supply Requirements - Intelligent Motion Systems IM805 Operating Instructions Manual

the driver if the supply is undersized. The output of an undersized power
supply could fall below the operating range of the driver upon a current
surge. This could cause the power supply to start oscillating in and out of
the voltage range of the driver and result in damage to either the supply, the
driver, or both.
There are two types of supplies commonly used, regulated and unregulated,
both of which can be switching or linear. Each have advantages and disad-
vantages.
R e g u l a t e d v s . U n r e g u l a t e d
An unregulated linear supply is less expensive and more resilient to current
surges, however, the voltage decreases with increasing current draw. This may
cause problems if the voltage drops below the working range of the drive.
Fluctuations in line voltage are also a point of concern. These fluctuations
may cause the unregulated linear supply to be above or below the antici-
pated or acceptable voltage.
A regulated supply maintains a stable output voltage, which is good for high
speed performance. These supplies are also not affected by line fluctuations,
however, they are more expensive. Depending on the current regulation, a
regulated supply may crowbar or current clamp and lead to an oscillation
that, as previously stated, can cause damage to the driver and/or supply.
Back EMF can cause problems for regulated supplies as well. The current
regeneration may be too large for the regulated supply to absorb. This could
lead to an over voltage condition which could damage the output circuitry of
the IM805.
Non IMS switching power supplies and regulated linear supplies with over-
current protection are not recommended because of their inability to handle
the surge currents inherit in stepping motor systems.
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20 IM805 Operating Instructions Revision R032306
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Table 5.1: Motor Power Supply Specifications
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