DMC-21x3 Accessories Chapter 9 AMP-20540/20520• 57
Under-Voltage Protection
If the supply to the amplifier drops below 12 VDC, the amplifier will be disabled. The amplifier
will return to normal operation once the supply is raised above the 12V threshold; bit 3 of the
error status (TA0) will tell the user whether the supply is in the acceptable range.
Over-Voltage Protection
If the voltage supply to the amplifier rises above 68 VDC, then the amplifier will automatically
disable. The amplifier will re-enable when the supply drops below 66 V. This error is
monitored with bit 1 of the TA0 command. This protection is configurable to activate at 34V
and re-enable at 33V by placing a jumper onto JP5.
Over-Current Protection
The amplifier also has circuitry to protect against over-current. If the total current from the
supply exceeds 40 A, the amplifier will be disabled. The amplifier will not be re-enabled until
the SH command has been sent or the controller is reset. Since the AMP-20540 is a trans-
conductance amplifier, the amplifier will never go into this mode during normal operation. The
amplifier will be shut down regardless of the setting of OE, or the presence of the #AMPERR
routine. Bit 0 of TA0 will be set.
Note: If this fault occurs, it is indicative of a problem at the system level. An over-current fault
is usually due to a short across the motor leads or a short from a motor lead to ground.
Over-Temperature Protection
The controller is also equipped with over-temperature protection. If the average heat sink
temperature rises over 110°C, then the amplifier will shut down. Bit 2 of TA0 will be set. The
amplifier will re-enable when the temperature drops below 110 °C. This error will trigger the
#AMPERR routine if included, and the user may decide whether to disable the amplifier.
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