Indication of fault conditions
OM3500 HF has the following indication LED on the front panel:
GRID MIN
- indication of first gird currency
GRID MAX
- max. First grid currency exceeded
HV
- measuring of anode voltage by bargraph
IP
- measuring of anode currency by bargraph
FAULT
- fault
OPR
- amplifier in operation mode
STBY
- amplifier in standby mode
WAIT
- heating of tube after switching on the amplifier
Should a fault condition appear during the tuning or operation of the amplifier the
safety circuits of OM3500 HF will react. The amplifier will be turned to STBY mode.
After approx. 1 sec the control circuits will switch the amplifier back to OPR. If the
fault will repeat 3 times after each other the control circuits will turn the amplifier to
STBY. Brining the amplifier to OPR is enabled by using the OPR/STBY switch.
After the reaction of safety circuits the FAULT LED will be lit up for approx. 5 sec
depending on the nature of the fault.
Flashing LED signalizes:
IP
- anode currency exceeded
HV
- low anode voltage
FAULT
- reflected output exceeded
GRID MAX
- first grid currency exceeded
- second grid currency exceeded
GRID MAX + HV
- maximum load power exceeded
GRID MAX + IP
- zero output power during tuning
HV + IP
- tuning fault, incorrect tuning of the Pi-L output circuit
In case your OM3500 HF amplifier is not working, please contact the
manufacturer.
