Section 3: Operation
Page 3-6
Instruction Manual 8144-DD/075020
ALM OUTPUTS:
Relay contacts are provided for remote alarm indications. Terminals 1 and 2
provide a contact closure for a MAJOR ALARM (loss of both clock inputs, power
failure, etc.), and terminals 1 and 3 provide a contact open. Terminals 4 and 5
provide a contact closure and terminals 4 and 6 provide a contact open for a
MINOR ALARM (loss of one reference input). Contacts are rated for 2 amps at
30 VDC and are isolated from ground.
Power Connections:
Check the serial number tag to verify the power option(s) installed in your
8144-DD.
Standard:
115/230 VAC 50/60 Hz
Option 52,12 VDC to 24 VDC:
±11.0 to 32 VDC
Option 54,48 VDC:
±55.2 VDC ±20%
DC options provide dual fused inputs and reverse polarity protection.
The DC PWR terminals are provided for two DC power sources and polarity is
marked on the chassis.
Both sources must have the same polarity
referenced to ground.
If AC power is provided, check the voltage selector in the AC power connector
and connect the power cord. If necessary, refer to Section 2.1.1, AC Line
Voltage Selection, to change to 230 VAC power.
CHASSIS GROUND:
This ground stud allows connection of the Model 8144-DD chassis to earth
ground. Connect the chassis ground to a known well-grounded frame or a
ground stake using the largest cable conductor possible.
PWR ON/OFF
:
This switch turns power on to the DC to DC converter in the unit.
WARNING: The AC section is always on, if AC
power is used.
The red LED inside the unit is illuminated whenever AC power is connected to
the unit.
Fuses:
Two DC power fuses are provided if unit is configured for either of the DC power
options (Option 52 or Option 54). Fuse markings on rear panel, are listed in
Section 5.1.
