SL SERIES MANUAL
23
118006-001 REV T
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.
