Section 2
– Operation
TOELLNER Electronic Instrumente GmbH
15
hysteresis), the device automatically clears the fault condition and the switching paths are
again driven. The permissible switching frequency range is then again available.
2.6.4
Excessive temperature protection
The excessive temperature protection responds to excessive component temperatures in the
unit. This protection is provided in two stages. For continuous operation at high voltage, high
current and high switching frequency, the fan speed is first increased.
If the component temperatures continue to rise, the internal driver stages are shut off, i.e. the
switching paths are no longer driven.
This fault condition is indicated by the
OVL
LED.
After an appropriate cool-down time the unit can be reset by turning it off and on using the
mains switch.
