The BlastPED Firing Process
- The BlastPED is turned On, then the operator connects the BlastPED to the bell wire leading to the face. Once connected, the BlastPED will remain synchronised, the output terminals and the internal capacitors are short circuited.
- The PEDCALL operator transmits the ARM command (the appropriate security disk must be inserted for this to occur). After the ARM command is received, the BlastPED ARMING LED will light and the short on the capacitors will be removed. The capacitors will commence charging.
- The BlastPED unit will remain armed for up to 10 minutes. The firing process will be automatically aborted after 10 minutes should blasting not be performed during this time. When the process is aborted it will require another ARM command before blasting can proceed.
- The PEDCALL operator sends the BLAST command to the unit which has been armed. As the BLAST command is received by the armed unit the charged capacitors are connected to the output terminals. The capacitors discharge into the firing line, initiating the detonators.
- Two (2) seconds after blasting the BlastPED unit automatically locks out:
- the unit's output is isolated from the battery and firing capacitors,
- firing cables (connected to output terminals) are short circuited by the internal relay contacts,
- subsequent ARM and BLAST commands are ignored,
- red LED labelled BLASTED shows that the unit is locked out.
- After blasting the unit remains locked until it is manually reset by the safety key returned to SAFE position.
- BlastPED unit must be reset (unlocked) before another firing output can be produced.