5
MASTER & SLAVE OPERATION
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Two or more Tenma 72-8355 Power Supplies can be connected in parallel to
increase output current to the sum of each supply. In this mode, the designated
MASTER supply will control voltage and current settings of the SLAVE supplies.
Preparation and connecting the Control Terminals (18)
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Ensure that all power supplies are set to the same UVL (6) and voltage RANGE (8).
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Set the voltage and current limit of all SLAVE units to maximum values.
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Switch off all power supplies before connection.
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Make certain the MASTER supply has switch (17) set in the MASTER position.
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Set the switch (17) to SLAVE position of all the SLAVE supplies.
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Refer to Fig 8.1 and 8.2 for rear connections of the OUT/IN terminals (18) of the
MASTER and SLAVE units.
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Take note that the connection begins at the OUT of the MASTER and feeds the IN
of the first SLAVE unit. If additional SLAVE units are used, connect the OUT of the
first SLAVE, to the IN of the second SLAVE. Then connect the OUT of the second
SLAVE to the IN of the third SLAVE and so on.
Output terminal connection and operation
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You can either use the front OUTPUT terminals (2) or rear O/P+ and O/P– terminals
(20) to connect to the load as shown in Fig 8.3 depending on your application and
requirements.
•
For proper performance, all power cables should be of the same thickness and
length.
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Switch on the MASTER unit first and set to desired voltage, then switch on the
SLAVE units.
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The SLAVE indicator LED (14) should light up in the SLAVE units as a confirmation
of proper connection.
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All output voltage and current of the SLAVE units are now controlled by the
MASTER.
Important Note:
If the load connected to the MASTER/SLAVE paralleled supplies falls
to zero amperes, the output voltage will no longer be controlled by the MASTER unit.
Make sure to keep a minimum amount of current draw on the supplies that is at least
several percent of the rated current. This can be accomplished by supplying a small
removable load such as a resistor.
