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c) Connect a wire jumper between J1-8 and J1-12 (refer to Table 4-4).
d) Connect J1 terminal 10(IPGM) of the slave unit to J1 terminal 25(P) of the
master unit.
e) Connect J1 terminal 23(IPGM_RTN) of the slave unit to J1 terminal 12
(COM) of the master unit.
During operation, the Slave units operate as a controlled current source
following the Master Output Current. It is recommended that the power system
be designed so that each unit supplies up to 95% of its current rating because
of the imbalance which may be caused by cabling and connection voltage drop.
5.15.1.3.
Daisy Chain Connection: (See Fig. 5-6)
This set up is optional but strongly recommended. It will shut down all power
supplies when a fault condition occurs in any one of them.
a) Switch SW1 position 5 should be in its down position for all power supplies.
b) Connect J1-16 of the Master Supply to J1-15 of the ‘First’ Slave Supply (If
any).
c) Connect J1-16 of the ‘First’ Slave Supply to J1-15 of the ‘Second’ Slave
Supply (if any).
d) Connect J1-16 of the ‘Second’ Slave Supply to J1-15 of the ‘Third’ Slave
Supply (If any).
e) Connect J1-16 of the ‘Last’ Slave Supply to J1-15 of Master Supply.
f)
Connect J1-2 (or J1-3) common to all supplies (See Fig. 5-6).
5.15.1.4.
Setting Over Voltage Protection
The master unit OVP setting should be programmed to the desired OVP level.
The OVP setting of the slave units should be programmed to a higher value
than the Master OVP. When the Master unit shuts down, it programs the Slave
unit to zero Output Voltage. If a Slave unit shuts down (when its OVP is set
lower than the Master Output Voltage and, if all P/S are not daisy chained per
section 3 above), only that Slave unit would shut down, and the remaining Slave
units would supply all the load current.
5.15.1.5.
Setting Foldback Protection
Foldback protection, if desired, may only be used with the Master unit. When
the Master unit shuts down, it programs the Slave units to zero Output Voltage.
5.15.1.6.
Connection To The Load
In parallel operation, power supplies can be connected in local or remote
sensing. Refer to Fig. 5-4 and 5-5 for typical connections of parallel power
supplies. The figures show connection of two units, however the same
connection method applies for up to 4 units.
5.15.2. Advanced Parallel Operation
In this method, multiple supplies can be configured to parallel operation as a single
power supply. The total load current and output voltage are displayed by the Master
unit and can be readback from the Master unit. The Slave units display only their
operating status (On, Off or Fault condition).
Refer to the following procedure to configure multiple supplies for advanced parallel
operation.
