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POWER REQUIREMENTS
SECTION 9.1
MOTOR POWER
Pins 11 (ground), and 12 (+V) are used to connect the motor DC power to the IM481H.
Two local capacitors are needed, connected between pins 11 and 12 and located as
close to the pins as possible, to insure stable operation.
The first capacitor is a low impedance, aluminum electrolytic. The continuous operating
voltage of the capacitor should exceed the maximum supply voltage as well as any
additional voltage caused by the motors back EMF. The value of the capacitor should be
approximately 150 microfarads for every 1 amp of peak per phase output current.
EXAMPLE: For a peak output current of 1.4 amps, and a supply voltage of 45 volts, a
220uf 50v capacitor is recommended.
Along with the aluminum electrolytic, a 0.1 microfarad ceramic capacitor must be used to
filter out high frequency noise. It should be located between the IM481H’s power input
pins and the aluminum electrolytic capacitor. The continuous operating voltage of the
capacitor should exceed the maximum supply voltage as well as any additional voltage
caused by the motors back EMF.
POWER SUPPLY SPECIFICATIONS
Table 4
Recommended Type: ..............Unregulated DC.
Ripple Voltage .............................±10% max.
Output Voltage ......................... +12 to +45Vdc
*Output Current .................. 0.75 Amps (TYPICAL)
NOTE: RECOMMENDED POWER SUPPLY IMS: PART # ISP200-4
With the exception of IMS Power Supplies, Switching Power Supplies and
regulated linears with overcurrent protection are not recommended because of
their inability to handle surge currents. If multiple drivers are to be run off of one
power supply each drive should have separate power and ground wires that
connect directly to the output capacitor of the power supply.
*THE OUTPUT CURRENT NEEDED IS DEPENDENT ON THE SUPPLY VOLTAGE,
MOTOR SELECTION, AND LOAD.
13
NOTE:
W A R N I N G : When using an unregulated power supply, care
should be taken that the output voltage does not exceed the
maximum driver input voltage because of variations in line
voltage. It is recommended that a input line filter be used on the
power supply to limit voltage spikes to the driver!!
W A R N I N G : Do not connect or disconnect motor leads with
power applied !! Do not connect or disconnect power supply
with power applied !!