2010 Construction and Material Specifications - Ohio Department of ...

837
733.03
Watchdog Timer, 24VDC, Conflict Program Card Ajar, and Monitor Fail. When
enabled, ensure that the extended Monitor functions become active including: Red
Fail, Multiple Output, and Yellow Fail.
(3) Special Function 1 and 2 Inputs.
(a) PIN 8, Special Function 1: Furnish an AC input to the
Monitor, which will DISABLE only the RED FAIL monitoring functions while it
is active (e.g. during Railroad Preempt).
(b) PIN 6, Special Function 2: Reserved for future use.
Furnish a means to select either a PRESENCE of, or LACK
of AC+ to enable these inputs.
f. Electrical Requirements.
(1) Operation Range. Furnish a Monitor that is fully
operational from an 85 to 135 V ac power source.
another.
(2) Isolation. Isolate the Chassis Ground and AC - from one
(3) Monitored AC Inputs. The following voltage and time
thresholds apply to all monitored AC inputs.
(a) Green and Yellow Inputs.
Any inputs < 15.0 V rms are considered OFF.
Any inputs > 25.0 V rms are considered ON.
Both sinusoidal and half-wave inputs of the specified
RMS values are to meet these thresholds.
(b) Red, Red Enable, and Special Function Inputs.
Any inputs < 50.0 V rms are considered OFF.
Any inputs > 70.0 V rms are considered ON.
Red inputs, both sinusoidal, and half-wave, of the
specified RMS values, are to meet these thresholds.
Red enable and special function inputs are to meet
these thresholds for sinusoidal waveforms only.
(c) Timing of Conflicting Inputs or Multiple Inputs.
Inputs ON < 200 ms are NOT considered a FAULT.
Inputs ON > 500 ms are considered a FAULT.
(d) Timing of Red Fail.
Lack of output < 1200 ms is NOT considered a FAULT.
Lack of output > 1500 ms is considered a FAULT.
(4) Monitored DC Inputs.
(a) 24VDC Input.
Input < 18.0 VDC is considered Low VDC input.