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POWER FAILURE SENSE PAC, MODEL CC-043
GENERAL DESCRIPTION
The Power Failure Sense PAC, Model CC-043 (Figure A-25), contains a circuit which
monitors the ac line voltage in a system and provides an output when the input voltage
drops below a predetermined level.
In addition, there are sixteen 510-ohm resistors con-
nected between the supply voltage and separate output pins.
The sensing circuit must be adjusted prior to being used in a system.
The exact
adjustment depends on the nominal ac line voltage and the sensitivity that the user desires.
It has a range from 80 to 13 Ov rms.
The initial adjustment procedure is as follows:
1.
Choose an rms voltage be low that which is to be considered a power failure.
2.
Using a Variac or equivalent, set the input voltage to the primary of a trans -
former (3C Part No. 938016001, or equivalent) at the voltage chosen in 1.
Connect the secondary of the transformer to pins 1 and 3 of the CC -043, with
the center tap to pin 5.
3.
Adjust R7 until negative pulses just begin to appear at pin 2.
Operating in a system with nominal line voltage and with the PAC adjusted as above,
pin 8 is active,
while pins 4 and 12 are passive.
Within 8 ms after the input voltage
drops below the adjusted value, these outputs will reverse (i.e.,
8 passive, 4 and
12 active) and remain.
After the input voltage returns to nominal value the PAC
may be reset by momentarily grounding pin 6.
A clamp diode to +6v is provided at pin 12 so
that a relay may be driven with this output.
SPECIFICATIONS
Input Loading
Pin 10: 1 unit load
Pin 6:
2 unit loads
Output Drive Capability
Pin 8:
Pin 4:
Pin 12:
6 unit loads
7 unit loads
8 unit loads
Frequency of Operation
50 or 60 cps input
Current Requirements
+6v: 45 ma
-6v:
10 ma
Power Dissipation
0. 33w
A-37
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