Operation
SHZF2/SHZF3 SCR Power Controller
16
Ametek HDR Power Systems
Rev 2
Figure 4.7 Unbalance Alarm Board
4.9
Shorted SCR Alarm
The Shorted
SCR Alarm, monitors each of the 3 SCR pair’s voltage drop and detects when an SCR is
shorted. Four LEDs are provided to help you determine the operation of the SCRs. Three green
LEDs are lit when the SCRs are not shorted. If an SCR shorts, the respective green LED will go out
and the red alarm LED will light and the Form C relay will energize. The relay output is on terminals
81 (N.O.), 82 (Common) and 83 (N.C.) as shown in Figure 4.8. The relay is energized on alarm.
These are the only customer connections.
Typically the SCR Shorted Alarm board is a piggy-back board on the Unbalance Alarm and does not
require any calibration.
The Shorted SCR Alarm can be used with or without the Unbalance Alarm
Figure 4.8 Shorted SCR Alarm Board
Summary of Contents for SHZF2 SCR Series
Page 6: ...Table of Contents SHZF2 SHZF3 SCR Power Controller iv Ametek HDR Power Systems Rev 2...
Page 8: ...Safety Instructions SHZF2 SHZF3 SCR Power Controller 2 Ametek HDR Power Systems Rev 2...
Page 12: ...Options SHZF2 SHZF3 SCR Power Controller 6 Ametek HDR Power Systems Rev 2...
Page 24: ...Operation SHZF2 SHZF3 SCR Power Controller 18 Ametek HDR Power Systems Rev 2...
Page 32: ...Troubleshooting SHZF2 SHZF3 SCR Power Controller 26 Ametek HDR Power Systems Rev 2...
Page 46: ...Appendix SHZF2 SHZF3 SCR Power Controller 40 Ametek HDR Power Systems Rev 2...
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Page 48: ...503 Lakeview Plaza Blvd Ste C Worthington Ohio 43085 USA...
