Connection to the load, Advanced parallel operation

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 the 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.

1.Advanced parallel configuration

SW1 position 2 - Down in the Master Supply and up in all Slave Supplies.

Connect a short between J1-8 and J1-12 in all Slave Supplies.

Connect J1-25 of the Master Supply to J1-10 of all Slave Supplies.

The following set-up connections are optional but are strongly recommended. These set- tings and connections will shut down all the parallel power supplies when a fault condition occurs in any one of them:

Switch SW1 position 5 should be in its down position for all power supplies (See Sec- tion 5.6)

Connect J1-16 of the Master Supply to J1-15 of the ‘First’ Slave Supply.

Connect J1-16 of the ‘First’ Slave Supply to J1-15 of the ‘Second’ Slave Supply (if any)

Connect J1-16 of the ‘Second’ Slave Supply to J1-15 of the ‘Third’ Slave Supply (if any)

Connect J1-16 of the ‘Last’ Slave Supply to J1-15 of the Master Supply

Connect J1-2 (or J1-3) common to all supplies

Select Local or Remote sense - Ref. Figures 5-4 and 5-5

2.Setting the units as Master or Slave

a)Depress and hold the FINE button for 3 seconds. The Master/Slave configuration will be displayed on the Current Display. Rotate the CURRENT encoder to obtain the desired mode. Refer to Table 5-4 for the CURRENT display and modes of operation.

CURRENT Display	Operating Mode
H1	Single supply (default)
H2	Master supply with 1	Slave supply
H3	Master supply with 2	Slave supplies
H4	Master supply with 3	Slave supplies
S	Slave supply

Table 5-4: Setting mode of operation

b)When the desired configuration is obtained, depress and release the FINE button or wait approx. 5 seconds.

3. Master and Slave units default operation

a)When a unit is programmed to Slave mode it enters the Remote mode with Local Lockout. In this mode, the front panel controls are disabled to prevent accidental setting change (refer to Sec.

7.2.7for details).

b)The Slave units parameters will automatically set the following: *Output voltage to approximate. 102% of rated output voltage. *Programmed Current to zero.

*UVL to zero volts

*OVP to its maximum value *AST On

*OUT On

*Foldback protection Off

83-507-013 Rev. D