65
83503001 Rev G
c) The Master and Slave modes are stored in the power supply EEPROM
when the AC power is turned off. The system will return to the Master/Slave
mode upon re-application of AC power.
5.15.2.5.
CURRENT Display Accuracy
In the advanced parallel mode, the Master unit calculates the total current by
multiplying the Master output current by the number of Slave units. In this
method, the CURRENT display accuracy is 2% +/- 1 count. In cases that higher
accuracy is required, it is recommended to use the basic parallel operation
mode.
5.15.2.6.
To Release Units from Slave Mode
Slave units can be released using the following procedure:
a) Depress FINE button for 3 seconds. The Master/Slave configuration will be
displayed on the CURRENT display.
b) Select H1 mode using the CURRENT encoder.
c) Depress FINE button again or wait 5 seconds.
d) Turn the AC power Off to store the new setting.
e) After exiting from Slave operation the unit’s parameters will be set to:
Programmed Voltage to zero
AST OFF
Programmed Current to zero
OUT OFF
UVL to zero volts
Foldback protection OFF
OVP to its maximum value
Locked Front Panel
f)
To unlock the front panel, depress PREView button until the display show
“UFP”
MASTER
POWER SUPPLY
SLAVE#1
POWER SUPPLY
J1-25
J1-10
P
IPGM
J1-12
J1-23
P
IPGM_RTN
+
V
-
V
+
V
-
V
LOAD
As short as possible
Twisted
pair
+S
-S
J1-8 J1-12
To J1-10
SLAVE#2
POWER SUPPLY
To J1-23
SLAVE#2
POWER SUPPLY
-S
-LS +LS
+S
+LS
-LS
Fig. 5-4: Parallel Connection with Local Sensing
CAUTION
Make sure that the connection between –Vo terminals are reliable to avoid disconnection
during operation. Disconnection may cause damage to the power supply.
NOTE
With local sensing it is important to minimize the wire length and resistance. Also
the positive and negative wire resistance should be close as possible to each
other to achieve current balance between power supplies
