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10. Protective facilities / Fault indication
10.1 Display
"th"
If excessively high temperatures build up inside the unit despite the fan cooling effect,
the charge mode will be blocked for a certain period of time and a long audible signal
will be emitted.
During the cool-down period "th" shows on the display of lamp base outlet 2 (15). The
display of lamp base outlet 1 shows in "countdown" procedure the remaining duration of
the cooling process. The fan continues to operate, thus accelerating the cooling effect.
Attention: Do not switch off the power pack while it is cooling down.
If the power
pack is switched off too early, it is likely, despite a long break, that only a few flashes
are possible when switching the unit on again, because the processor has not been
able to follow the entire cooling process.
10.2 Display
"A1"
The unit is equipped with an automatic afterglow blockout. If the flash tube exhibits
afterglow (for example at the end of its service life), this blockout will block further
charging to prevent consequential damage. A1 will show on the display of lamp base
outlet 2 (15). In this status, the ready lamp is no longer green. The block can be
cancelled by switching the unit off and on again.
10.3 Circuit
breaker
In the event of an electrical malfunction, the circuit breaker (2) will automatically
disconnect the power pack from the power source. The unit can be restarted by
pressing the circuit breaker button. If it disconnects again immediately, the power pack
must be serviced by authorized service staff.
10.4
Monitoring of the modelling light
If the power packs Topas A2 and Topas A4 are connected to 200-240 V mains (AC-line)
voltage, after previously having been operated on 100-120 V mains voltage, they will
release an audible signal and the modelling light will blink at a safely reduced voltage.
This function serves as a reminder that the modelling lamp must be exchanged, and
also to protect against bursting of the lamps. Switch the unit off and on again to return to
standard operation.
10.5
Acoustic trigger control
At the end of their service life the flash tubes often show flash trigger failure. This fault is
indicated by the unit with an intermittent acoustic signal. The sound disappears, when
the flash tube flashes again correctly or the unit is switched off.
