gefran TPD32-EV-...-2B, Instructions Manual

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Figure 1: SCR test Figure 2: Example. Open SCR (white) displayed with GF_eXpress Tool
Figure 3: Example. SCR shorted (red) displayed with GF_eXpress Tool
Open SCR thr Setting of current limit for detection of open SCR. .
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If the current flowing through the SCR module is below 50% (factory setting) of the average
level measured in the period, the message SCR open: “Open F <…>” is shown.
Higher settings increase the sensitivity of measurement. (Example: a setting of 90% is very
sensitive but could generate false detections of open SCRs.)
1527 Open test act Setting Drive Status 1525 SCR diag status Displayed on TPD32-EV Keypad
Open test act = Disable Drive
Open W <SCR> @ 50% of Internal Integer value -
DISABLED Open F <SCR> @ 100% of Internal Integer value Open SCR
Open test act = Ignore
Open W <SCR> @ 50% of Internal Integer value -
IGNORE Open F <SCR> @ 100% of Internal Integer value -
Open test act = Warning
Open W <SCR> @ 50% of Internal Integer value -
WARNING Open F <SCR> @ 100% of Internal Integer value Open SCR
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nternal integrator
At each line frequency period, the software compares the current that flows when the SCRs are
active to the average current in the period, increasing or decreasing the value of the integrator
if the current flowing through the SCR is below or above, respectively, that of the period based
on the set limit.
Example:
- Limit at 50% (default) - IPA 1528 Open SCR thr
The current flowing through the SCR is 30% of the average in the period --> The integrator is
increased by 20 counts.
The current flowing through the SCR is 60% of the average in the period --> The integrator is