UM8-40 MANUAL
5
118103-001 REV D
Chapter 3
Operating Instructions
3.1 Operation
WARNING!
This equipment generates dangerous voltages
that may be fatal.
Proper grounding of all high voltage equipment
is essential.
It is highly recommended that all testing comply
with IEEE Standard 510-1983 IEEE
Recommended Practices for Safety in High
Voltage and High Power Testing. A copy of this
standard can be downloaded from the Spellman
High Voltage website
here
.
INPUT VOLTAGE
Check the identification label on the power supply and
confirm it matches the input voltage of the source supply
that will be used to power the UM8-40 module. 4 watt
units operate off +12Vdc, while 15 and 30 watt units
operate off +24Vdc. If a 4 watt a unit is connected to
+24Vdc, the unit will operate properly meeting all
specifications. If a 15 or 30 watt unit is connected to
+12Vdc, no damage will occur but the unit may not
perform properly.
HIGH VOLTAGE CONNECTION
Insure that high voltage connection is properly terminated
to the load. Confirm that adequate air isolations spacings
exist for the maximum voltage of the power supply, using
the guideline of 10kV per inch (25.4mm) to any points
that will be elevated to high voltage. All accessible high
voltage points should be enclosed in a protective Faraday
enclosure. Any access panels on the safety enclosure
should be interlocked.
GROUNDING
Proper grounding of the unit is essential for reliable
operation. Power Ground, Signal Ground and HV Ground
Return are connected internally. For best performance
they should not be connected externally.
The Power Ground connection (Pin 1) carries the +12Vdc
or +24Vdc current that powers the unit, make this
connection adequate enough to handle 2 amps, minimum.
Additionally it is recommended that this connection be
used to tie the power supply to whatever potential is used
as the local “system ground”.
Signal grounds relating to programming and monitor
functions should be referenced to the UM8-40’s Signal
Ground (Pin5).
A physical load return connection must be made from the
bottom of the load to the power supplies HV Ground
Return (Pin 8).
See Figure 2 for details.
OPTIONS
See Section 5 of this manual for setup and operating
instructions if the unit under test has any options. Custom
X numbers units may also require special test
requirements; consult the unit’s specification control
drawing for details.
SIGNAL CONNECTIONS
Connect the appropriate programming and monitoring
signals to the unit as detailed in the figures in this chapter.
INITIAL TURN ON
A)
Set the voltage and current programming inputs
for zero output (Pin 6A and 5A respectively).
Ground the Enable Input (Pin 4), to assure the
unit is in HV OFF mode.
B)
The DC input power can now be connected.
C)
Enable the power supply by opening the Enable
Input (Pin 4).
