EPM/SMS MANUAL
1
118026-001 REV K
Chapter 1
I
NTRODUCTION
1.1 Description Of The EPM/SMS
Series
he EPM/SMS series of high voltage power supplies
provides very well regulated, low ripple high voltage
in a highly efficient, compact design. The
dramatically reduced size of these modules compared to
traditional high voltage modules, is obtained by a state of
the art off-line resonant converter. The resonant converter
utilizes a unique control scheme, which allows constant
frequency operation while maintaining high efficiency.
High operating frequency allows for very low ripple and
excellent dynamic response capabilities.
The DC output voltage and current are controllable over
the full range of operation. Monitoring and control
signals are provided for simple, yet flexible control of the
power supply. The EPM/SMS series operates from
24VAC ±10% or 28Vdc ±10%. (The user should specify
the input voltage at the time of order). The EPM series
operates at 30W continuous and the SMS series operates
at 60W continuous. Neither series requires forced air
cooling. The ambient temperature must be kept below the
maximum rating as specified in 1.2. Consult Spellman
Sales Department for higher power capabilities of the
EPM/SMS series.
The standard warranty applies to the EPM/SMS series
modules. Consult factory about the warranty for custom
modules.
1.2 EPM/SMS Specifications
•
Output Control
: Voltage and current are externally
programmable over the entire range from zero to
maximum rating via 0-10VDC reference or
potentiometer. (Other scale factors for control and
monitoring can be provided i.e. 1 volt per 10KV, 1
volt per 10mA etc.).
•
Input
Voltage: 28Vdc ±10%, 28Vdc ±10% optional.
(Consult the factory for other input
voltages.)
Current: 5A max. on SMS models, 3A max. on
EPM models.
•
Voltage Regulation:
Load Regulation
: 0.01% of full voltage for a no
load to full load change.
Line Regulation
: ±0.01% of full voltage over the
specified input voltage range.
•
Current Regulation
:
Load Regulation:
0.05% ±25uA from 0 voltage to
full voltage.
Line Regulation
:
0.01% of full current over the
specified input voltage range.
•
Ripple
:
0.1% p-p of output voltage.
•
Polarity:
Positive or Negative polarity with respect to ground.
(Specify at time of ordering).
•
Stability:
0.01% per hour after 1/2 hour warm up.
•
Temperature Coefficient
:
100 ppm per
C.
•
Temperature:
Operating: -20
C to -40
C
Storage: -40
C to +80
•
Monitoring:
0 to 10VDC corresponding to 0 to 100% of output
voltage
0 to 10VDC corresponding to 0 to 100% of output
current. (Other scale factors available).
•
Control:
Control signal for high voltage enable/disable.
•
Environmental:
Indoor use
Altitude up to 2000 meters
80% max. rel. humidity for temperatures up to 31ºC,
decreasing linearly to 50% rel. humidity at 40ºC.
Pollution degree 2 (IEC664)
T
