SECTION 2
SPECIFICATIONS
14
2.3
ELECTRICAL INTERFACE
2.3.1 ISOLATION
The UPC uses one isolated power supply for all circuits. The REMOTE interface is
NOT
isolated from
control circuit power. The UPC circuits may float with respect to Earth-GND but it is not recommended.
Internal to the power source, power supply common is connected to the chassis/Earth-GND. The user
may establish their own local ground by removing the link from power supply common and chassis.
2.3.2 INPUT POWER
If the UPC is installed in a power source chassis, see the power source manual for power requirements.
The System Control Unit (SCU), with a UPC installed, operates on 115 or 230 VAC, 47-440 Hz, selected
via a recessed switch on the back of the SCU. A front panel circuit breaker provides input protection. The
UPC circuits r10 Vdc and ±20 Vdc at J6, supplied by the SCU or power source.
2.3.3 ANALOG OUTPUTS
The oscillator waveform (
Ф
A,
Ф
B,
Ф
C) differential outputs are available on J3. They are capable of
driving full output of ± 10 V
peak
into a 600 ohm load.
2.3.4 OUTPUT CONTROL
J3 digital outputs are ± 15 VDC, positive logic.
The UPC sends the following control signals to the power source on J3:
NAME
FUNCTION
3
Ф
- CMD
3
Ф
output form command
1
Ф
- CMD
1
Ф
output form command
NOTE:
If both 3
Ф
and 1
Ф
are false, the form is 2
Ф
CONNECTOR - CMD
Verify UPC is connected to power source.
Also drives audible beeper in power source installations
EXT SENSE - CMD
External metering command
XFMR CPLD - CMD
Transformer coupled output command
OUTPUT ON -CMD
Close output relay command
2.3.5 OUTPUT CONFIRMATIONS
J3 digital inputs are ± 15 VDC, positive logic.
The power source sends the following control signals to the UPC on J3:
NAME
FUNCTION
CONNECTOR - CONF
Verify UPC is connected to power source
(loops back to the CONNECTOR
– CMD connection)
SHUTDOWN - CONF
Power source shutdown confirmation
3
Ф
ON - CONF
3
Ф
output relay is closed
1
Ф
ON - CONF
1
Ф
output relay is closed
XFMR CPLD - CONF
Transformer coupled output confirmation
