Elmo DBP SERIES Protective functions, 4.7.1Short circuit protection, 4.7.3Temperature protection

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4.7 Protective functions

All the protective functions except "Low Back-up Battery Voltage" activate an interrupt to the main processor which inhibits the power bridge and disable current flow to or from the motor. The user can interrogate the processor in order to verify the cause of the inhibit. An indication of the fault will appear on the display. The following protections are processed by the DCB:

4.7.1Short circuit protection

The amplifier is protected against shorts between outputs, or either output to ground, or either output to the positive supply line.

4.7.2Under/over voltage protection

Whenever the DC bus voltage is under or over the limits indicated in the technical specifications, the amplifier will be inhibited.

4.7.3Temperature protection

Temperature sensor is mounted on the heatsink. If, for any reason, the temperature exceeds 85°C the amplifier will be inhibited. The amplifier will restart when the temperature drops below 80 °C. The user can always interrogate the DCB about the heatsink temperature by using the command T?.

4.7.4Internal power supply failure

In any case that the sum of the internal power supplies is below 13V or its difference higher than 1V, the amplifier will be inhibited.

4.7.5Loss of commutation feedback

Lack of either of the commutation signals will inhibit the amplifier.

4.7.6Low back-up Battery voltage

When the battery voltage goes below 2.4V the DCB will send a message on the communication line and will display "BATT" on the display.

DBP - Rev 6/93