Models DC-1, -10, -20B DC Spark Testers
DC-1, -10, -20B Instruction Manual
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Page 21
Definition of Terms
Actual Voltage-
Actual voltage is a metering winding on the high voltage transformer. This winding can
be monitored remotely and indicates the level of voltage supplied to the electrode.
Any Fault Alarm-
This alarm will respond when a fault of any type is detected. This alarm can be latched,
and when latched the voltage can be removed or left on. When the alarm is not latched, the duration of
this alarm is selectable. (See Latch, Non-Latch, & Remove Voltage on Fault, below).
Electrode Voltage-
This is a new feature, exclusive to Clinton’s
DC-B spark tester, a separate circuit makes
a direct connection to the spark tester electrode. The voltage is monitored by a high impedance sensing
circuit providing immediate data about the voltage at the electrode. This data is crucial to differentiate
the different fault types.
Fault Pulse-
The fault pulse is a signal generated by the DC-B when a defect is detected. This signal causes
the front panel fault lamp to light, increments the fault counter, and initiates process control relays to
change state. In general, the fault pulse must last at least as long as the fault stays in the electrode, in
order for a single fault to be counted only one time.
Fault Sensitivity-
Fault sensitivity refers to the amount of current that must pass through a pinhole or
other defect type to be detected as a defect and typed accordingly.
“
NOR
”:
The Normal Sensitivity setting is Clinton Instrument Company’s bench standard and will pass the
IEC 62230 600
u
A standard for spark tester sensitivity.
“
RED
”:
The Reduced Sensitivity setting will meet the NEMA WC 56 standard for spark tester sensitivity
and will meet the IEC 62230 reduced sensitivity (1.2 mA) standard used when high product capacitance
causes false or phantom counting. For more information, contact the Clinton Instrument Company at
Gross Barewire-
Gross Barewire is defined as a fault where the wire conductor is exposed, allowing metal
contact to be made with the electrode for a period of time equal to two and one half times the electrode
length.
High Voltage Enable-
In order for the DC-B to generate high voltage, the HV-ENABLE terminal must be
connected to the GROUND terminal on the terminal block. This can be by direct wire jumper at the
terminal block (pins 1 and 2) or the connection can be made remotely by switches or control relays.
Latch, Non-Latch, & Remove Voltage on Fault-
These are the conditions under which the fault relay
operates when a fault is detected.
Latch-
When a fault is detected the fault relay will change state and remain in that state until a reset
command is given, either by pressing the front panel reset button, connecting the RESET and GND
terminals on the terminal block, or providing a remote reset command through the Compact Comm
modules. High Voltage remains ON while the relay is latched.
Non-Latch-
When
a fault is detected, the fault relay will change state only for the amount of time the fault
remains in the electrode. This time can be extended by changing the Process Control Duration Time.