CSPN Capacitor Charging Unit Operation Manual
CSP-CSPN-8000/1
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1.2. Introduction
The CSP-N is an evolution of the CSP-D range of seismic power supplies. The CSP-N has a high
voltage charger rated at 2000 joules per second, and can supply up to 1200 or 2400 joules of
energy per shot into the seismic sound source for example Dura-Spark. The CSP-N allows the
user to select HI and LO power levels this can effectively tune the source to a lower frequency
response.
The CSP-N incorporates many common parts to the CSP-D, -P, -S range of power supplies and
apart from utilizing negative High Voltage can be considered essentially as the same. All units
feature a switchable soft start ‘power save’ circuit; AVIP (Automatic Variable Input Power) which
allows the units to be operated from reduced generator sizes when operating at low output
powers:-
Traditional high voltage power supplies (bang boxes) will charge the energy storage capacitors at a
fixed high rate for example at 1500J per second even when the average energy drawn from the
capacitors is less; a typical example may be 100 J at 3 pps (300J). This results in a rapid capacitor
charge rate for 67 mS followed by nothing, until the next discharge / charge cycle. This charge / no
charge operation can often result in generator hunting as the load changes, and may mean that a
larger generator is needed than would be the case if the power requirement was averaged over
time. By reducing the peak charge rate, the generator hunting is all but eliminated, and a smaller
capacity generator is required. The AVIP circuitry will automatically adjust charge rate from 20% to
100% of specification, thus lowering the peak charge rate to just 300 J / second compared to
bursts of 1500J/second. The circuitry also features a soft start function, which may take around 20
seconds before the charge rate is ramped up to the correct amount for the task in hand.
The CSP-N allows the user to effectively ‘tune’ the sound source to operate at a lower frequency
by lowering the operating voltage and increasing the capacitance to supply the correct energy to
the sound source. This may be effective in certain instances where more penetration is required.
The CSP-Ns monitor the output of the system for open circuit fault conditions and over current fault
conditions, limited to approx. 9000A.
Summary of Contents for CSP-N 1200
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