Hybrid Servo Hardware Installation Manual
11
output rating to avoid problems like current clamp, for example using 4A supply for 3A motor-drive
operation. On the other hand, if unregulated supply is used, one may use a power supply of lower
current rating than that of motor (typically 50%～70% of motor current). The reason is that the drive
draws current from the power supply capacitor of the unregulated supply only during the ON
duration of the PWM cycle, but not during the OFF duration. Therefore, the average current
withdrawn from power supply is considerably less than motor current. For example, two 3A motors
can be well supplied by one power supply of 4A rating.
Multiple Drives
It is recommended to have multiple drives to share one power supply to reduce cost, if the supply
has enough capacity. To avoid cross interference, DO NOT daisy-chain the power supply input pins of
the drives. Instead, please connect them to power supply separately.
Selecting Supply Voltage
Higher supply voltage can increase motor torque at higher speeds, thus helpful for avoiding losing
steps. However, higher voltage may cause bigger motor vibration at lower speed, and it may also
cause over-voltage protection or even drive damage. Therefore, it is suggested to choose only
sufficiently high supply voltage for intended applications, and it is suggested to use power supplies
with theoretical output voltage of drive’s minimum + 10% to drive’s maximum – 10%, leaving room
for power fluctuation and back-EMF.
Select Power Supply Voltage
Driver Input Voltage
Driver Upper Input limit
Power Supply Voltage
Heating
Vibration
Maximum Safe Rating
Driver Upper Input limit – 10%
Driver Lower Input limit + 10%
Driver Lower Input limit
Minimum Safe Rating
Torque
Speed
Safe Region
Driver Input Voltage
Driver Upper Input limit
Power Supply Voltage
Heating
Vibration
Maximum Safe Rating
Driver Upper Input limit – 10%
Driver Lower Input limit + 10%
Driver Lower Input limit
Minimum Safe Rating
Torque
Speed
Safe Region
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