UM8-40 MANUAL
6
118103-001 REV D
D)
Set the current programming level (Pin 5A) to
just above the current anticipated that will be
drawn from the power supply or leave open for
preset current to 103% of rated current.
E)
Slowly increase the voltage programming (Pin
6A) while monitoring the voltage and current
monitors (Pin 4A and 3A respectively).
Carefully note proper equipment operation and
that the load is behaving as predicted.
F)
To turn the HV OFF ground the Enable Input
(Pin 4). If the equipment is to be left off for an
extended period of time or service of the unit or
load is required turn off the DC input power.
Legacy Interface Units:
Negative output polarity units are programmed such that
5.0Vdc to 0.36Vdc equals 0 to 100% of rated output
voltage
WARNING!
After turn off do not touch anything that has
been connected to the output of the power
supply. Wait a minimum of 5 minutes, and then
discharge any remaining stored energy by
connecting the high voltage output to ground.
Failure to follow these safety warnings can result
in injury or death.
3.2 Standard
Features
Programming and monitoring of the UM8-40 is
accomplished via the use of conventional positive
polarity, ground referenced signals. All signal inputs and
outputs are noise filtered, impedance protected and diode
clamped providing an easy to use, robust analog customer
interface. Excellent results have been obtained via the use
of standard engineering design guidelines like twisted
pair, shielded cables, the prudent dressing of interface
wiring away from possible noise sources, short cable runs
and adhering to a well thought out and executed
grounding topology.
REMOTE PROGRAMMING
The UM8-40’s programming and monitor signals are
based upon a universal, positive polarity, ground
referenced signal such that 0 to 4.64Vdc corresponds to 0
to 100% rated output.
Programming can be accomplished via the use of an
applicable customer provided ground referenced voltage
source that meets the mentioned requirements. See Figure
3 for details.
If such a source is not available a pre5Vdc
reference is provided on Pin 7. A simple adjustable
voltage divider can be created using this reference and an
external potentiometer(s) which will provide full control
of the voltage and current loops. See Figure 4 for details.
REMOTE MONITORING
The voltage and current monitor signals have adequate
bandwidth capability to accurately represent the actual
respective output within the dynamic limits of the power
supply. See Figure 5 for details.
ENABLE INPUT
The enable input signal provides simple control of the
ON/OFF functionality of the high voltage output. See
Figure 6 for details.
WARNING!
It is extremely dangerous to use this circuit to
inhibit high voltage generation for the purpose of
servicing or approaching any area considered
unsafe during normal usage.
