SL SERIES MANUAL
23
118006-001 REV Y
5.12 Bipolar Master/Slave
Option--MS
The Bipolar Master/Slave option allows two supplies of
the same voltage rating but opposite polarities to functions
as a single tracking bipolar power supply. The positive
supply is configured as the Master, the negative supply is
configured as the Slave. This is accomplished by
connecting the Voltage Test Point of the positive (Master)
unit to the Voltage programming of the negative (Slave)
unit. See Figure 5-8. The Master’s voltage programming
signal will provide control of both power supplies from
zero to rated output voltage. The negative polarity will
track the positive polarity within
1% from 10% to full
rated output. Performance specifications are governed by
individual unit characteristics. The two units must be
connected independently to their respective loads and
ground.
5.13 External Fault Relay Option
EFR
The external fault relay option provides a set of customer
accessible relay contacts that are controlled by the fault
status circuitry of the applicable SL Series power supply.
A standard SL power supply will revert to the “power
down” mode with a visual front panel indication if any of
the following fault conditions occur:
Overvoltage:
Greater than 110% of maximum
output voltage was produced by the power supply.
Overcurrent
: Greater than 104% of maximum
output current was produced by the power supply or
the AOL circuitry was activated.
Overtemperature:
Excessive temperature has been
sensed within the chassis.
Regulation Error:
Lack of required output power to
maintain regulation
Arc (Shutdown):
Arc sensing circuit has shut down
the supply due to excessive arcing.
Overpower:
The power supply has exceeded the
internally set power limit level, if such circuitry is
installed.
With the installation of the EFR option for TB1, if any of
these faults occur, a relay will be activated to provide a
remote indication that the power supply has reverted to
the “power down” mode. The common, normally open
and normally closed set of contacts are provided. Relay
contacts are rated at 1A at 30Vdc or 0.5A at 48Vac.
Connections on the rear panel Terminal Block (TB1) can
be made as follows:
TB1-23
(J5-12)
Relay Common
TB1-24
(J5-NA)
Normally Closed
TB1-25
(J5-13)
Normally Open
Resetting the front panel and EFR relay is accomplished
by depressing the green front panel HV OFF push-button
switch, which reverts the power supply back to the
“standby” mode. Removal and reapplication of the AC
line input voltage will also reset any fault.
The circuitry and components required for the EFR option
are installed at the factory when this option is ordered.
5.14 Custom Designed Models-X#
Units built to customer specification are assigned an X
number by the factory. If this unit is an X model, a
specification control sheet is added at the end of the test
of this instruction manual.
Spellman welcomes the opportunity to customize units to
fit your requirements or to develop new products for your
applications. Contact the Spellman Sales Department
with your needs.
