17
462
Stepping motor drivers are designed with the intention that a user’s power
supply output will ramp up to greater or equal to the minimum operating
voltage. The initial current surge is quite substantial and could damage the
driver if the supply is undersized. The output of the power supply could fall
below the operating range of the driver upon a current surge if it is undersized.
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 unregu-
lated, both of which can be switching or linear. All have their advantages and
disadvantages.
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 can
cause problems if the voltage drops below the working range of the drive.
Also of concern is the fluctuation in line voltage. This can cause the unregu-
lated linear supply to be above or below the anticipated or acceptable voltage.
A regulated supply maintains a stable output voltage which is good for high
speed performance. They are also not bothered 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 IB462H.
Non IMS switching power supplies and regulated linear supplies with
overcurrent protection are not recommended because of their inability to
handle the surge currents inherit in stepping motor systems.
P o w e r S u p p l y S p e c i f i c a t i o n s
Recommended type ............................................... Unregulated DC
Ripple Voltage ................................................................ ±10%
Output Voltage ....................................................... +12 to +40VDC
*Output Current ............................................................ 2A Peak
* The output current needed is dependant on the power supply voltage, motor
selection and load.
WARNING!
Verify that the power supply wiring is correct
prior to power application. If +V and GND are connected in
reverse order catastrophic damage to the IB462H may
occur! Ensure that the power supply output voltage does not
40VDC, the maximum input voltage of the IB462H!
WARNING!
Hazardous voltage levels may be present if
using an open frame power supply to power the IB462H!