
Under-Voltage Protection
If the supply to the amplifier drops below 18 VDC, the amplifier will be disabled. The amplifier will return to
normal operation once the supply is raised above the 18V threshold.
NOTE
: If there is an #AMPERR routine and the controller is powered before the amplifier, then the #AMPERR
routine will automatically be triggered.
Over-Voltage Protection
If the voltage supply to the amplifier rises above 94 VDC, then the amplifier will automatically disable. The
amplifier will re-enable when the supply drops below 90 V.
The over voltage condition will not permanently shut down the amplifier or trigger the #AMPERR routine. The
amplifier will be momentarily disabled; when the condition goes away, the amplifier will continue normal operation
assuming it did not cause the position error to exceed the error limit.
Over-Current Protection
The amplifier also has circuitry to protect against over-current. If the total current from a set of 2 axes (ie A and B
or C and D) exceeds 60 A, the amplifier will be disabled. The amplifier will not be re-enabled until there is no longer
an over-current draw and then either SH command has been sent or the controller is reset. Since the AMP-43740
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.
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 amplifier is also equipped with over-temperature protection.
If the average heat sink temperature rises above 80°C, then the amplifier will be disabled. The over-temperature
condition will trigger the #AMPERR routine if included in the program on the controller.
The amplifier will not be re-enabled until the temperature drops below 80°C and then either an SH command is
sent to the controller, or the controller is reset (RS command or power cycle). A proper heatsink is highly
recommended for the AMP-43740.
A6 – AMP-43740 (-D3740) ▫ 246
DMC-40x0 User Manual