Elmo SERVO AMPLIFIER DBP SERIES - Manual (Page 27)

26
DBP - Rev 6/93
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:
4.7.1 Short circuit protection
The amplifier is protected against shorts between outputs, or either output
to ground, or either output to the positive supply line.
4.7.2 Under/over voltage protection
Whenever the DC bus voltage is under or over the limits indicated in the
technical specifications, the amplifier will be inhibited.
4.7.3 Temperature 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?.
4.7.4 Internal 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.
4.7.5 Loss of commutation feedback
Lack of either of the commutation signals will inhibit the amplifier.
4.7.6 Low 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.