Chapter 3
Connecting Inlet Power, Input and
Output Signals
Instructions in this chapter include making connections to the rear panel of the clock. Carefully
examine the labels to verify the inlet connections and voltages. It is possible to have two different
inlet voltage ranges. The clock has no power switch. It becomes energized with the application of
power.
3.1
Universal, High Voltage Power Supply Inlet
The universal, high voltage power supply accepts 85 Vac to 264 Vac, 47 Hz to 440 Hz or 100 Vdc to
350 Vdc (
<
30 Watts typical) on a pluggable, three-terminal connector. This power supply inlet
can be located in a position labeled
POWER A
or
POWER B
on the rear panel. See Figure 3.1.
Figure 3.1: Universal Power Supply Inlet Connector
L1/
DC+
L2/
DC- GND
100-350 Vdc
85-264 Vac/47-440 Hz
<30 W Typical
3.1.1
Universal Supply: Connecting Inlet Power
The terminals are labeled as L1/DC+, L2/DC- and GND. L1 is the hot lead, L2 is the neutral,
and GND is the ground.
Strip the inlet wire 6 mm (1/4 in) and DO NOT TIN the bare wire with solder. Insert each
wire into the appropriate terminal and tighten the set screws clockwise to secure. When connecting
power to the clock, connect the ground lead first.
For AC inlet power: L1 is the hot lead, L2 is neutral, and GND is ground.
For DC inlet power: DC+ is the positive lead, DC- is the negative lead, and GND is ground.
The clock has no power switch. It becomes energized with the application of power.