CHAPTER ONE
It also has the capability of measuring the frequency, phase angle, and elapsed time offset of an
externally applied 50 or 60Hz AC sine wave.
Input Voltage AC = 85 to 264 VAC (47-440 Hz) @ less than thirty watts.
DC = +120 to 373 VDC
Input Frequency Range 47 to 440 Hz
Fault Relay Closure on fault.
Timing Relay Closure when not locked.
Relay Contact Ratings 10 watts, 0.5 amps, 200 volts.
50/60Hz Measurement Input 85-250 VAC.
Note: When using 120 VAC, install 1 Amp Line Fuses. When using 220 VAC, install ½ Amp
Line Fuses. Fuses are found in the Shipping Kit.
All input/outputs from the 55191 are from a rear panel terminal strip TB1.
All input/outputs have metal oxide varistors for transient voltage suppression.
The pin assignments for TB1 are shown below (as viewed from the rear of the unit):
TB1-1 TB1-12
Pin Assignments
TB1-1 AC HI Input
TB1-2 AC LO Input
TB1-3 Chassis Ground
TB1-4 Fault Relay - Common Contact
TB1-5 Fault Relay - Normally Closed Contact
TB1-6 Timing Relay - Common Contact
TB1-7 Timing Relay - Normally Closed Contact
TB1-8 50/60Hz Measurement Input - HI
TB1-9 50/60Hz Measurement Input - LO
TB1-10 Not Used
TB1-11 Not Used
TB1-12 Not Used
1-12 ET6xxx ExacTime GPS TC & FG (Rev C) Symmetricom Inc
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