EPM/SMS MANUAL
16
118026-001 REV K
Chapter 5
O
PTIONS
He options available for this power supply are
described in this section. Interface diagrams are
shown where required. Options are specified by
including the option code in the model number as
described in Section 1.4.
5.1 Floating Ground
FG
The floating ground option allows isolation of the power
supply common from chassis ground. A typical
application for FG is for connection of an external meter
or circuit into the FG signal point. This circuit can
monitor actual current flow at a low voltage level. See
Figure 5.1 for typical connection to the floating ground
terminal.
IMPORTANT
The power supply common must be
connected to chassis ground through a
low impedance circuit. The power
supply common is clamped to chassis
ground using a power zener diode. This
diode is not intended to clamp under
continuous operation. On higher
current units the power dissipation
within the zener diode can be excessive
if allowed to clamp.
5.2 24Vdc
24
EPM/SMS series power supplies with the 24Vdc input
option will operate from an input voltage of 24Vdc±10%
5.3 No Slow Start
NSS
The no slow start option causes the output voltage of the
power supply to rise (within 500 msec) to the rated
voltage upon Power Up.
5.4 Non-Standard Slow Start
SS(x)
The non-standard slow start option allows the gradual rise
time of the output voltage to be different from the
standard of six seconds. To order the option, place the
time desired in seconds after the suffix letter; i.e. SS(10)
denotes a 10 second rise time.
5.5 Extra Length Output Cable
LL(ft)
Standard output cable is 18” long. Other lengths may be
specified.
5.6 Custom Designed Models X(#)
Units built to customer specifications are assigned an X
number be the factory. If this unit is an X model,
specification control sheet is added at the end of this
instruction manual.
Spellman welcomes the opportunity to tailor its units to fit
your requirements or to develop new products for your
applications. Contact the Spellman Sales Department
with your needs.
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