KEPCO KLR Series User Manual - Manual (Page 38)

2-14
KLR 091313
d. The output voltage setting of all power supplies must be adjusted to the same voltage as
closely as possible, and in any case within a ±1% error band, to ensure adequate range of
the load sharing circuit. In addition, the output current setting should be identical for all power
supplies and high enough to support all load requirements, including both static and tran-
sient loading conditions.
2.7.8 MASTER/SLAVE CONFIGURATIONS [STANDARD MODELS ONLY]
Master/slave configurations of power supply pairs can be used to allow changes to output volt-
age/current of one supply (master) to affect the output of the other (slave). Both units of a mas-
ter/slave configuration must be identical models. Master/slave control is implemented using the
RS 232 ports. After connecting the series or parallel pair (see PAR. 2.7.6 or 2.7.7, respectively),
use a null modem cable, minimum length 0.5 foot, DB9F-DB9F, to connect the RS 232 ports of
both power supplies. Then refer to PAR. 3.2.14 to complete the setup of each power supply in
the master/slave configuration.
If GPIB control of the master/slave pair is desired, the user must connect to the master unit
using an “in-line” style connector, as the commonly-used stackable connector will interfere phys-
ically with the RS 232 connector above it. Contact Kepco Sales Engineering for additional guid-
ance.
2.7.9 ANALOG I/O CONNECTIONS
The Analog I/O Port connector, located on the rear panel of the KLR power supply (see Figure
2-2), provides access for all analog programming inputs and status signal outputs. In addition,
an external trigger input is available for use with SCPI *TRG and TRIG commands. Refer to
Table 2-7 for analog I/O programming signal pin assignments and descriptions.
These signals must be protected from radiated and conducted noise as well as from physical
contact with non-valid driving sources. The following subsections address specific programming
signal applications; in general, however, when accessing this connector from distant locations or
high-noise environments, it is recommended that a shielded cable be used, with the shield ter-
minated to the system's single point ground.
a. Analog Programming Enable (ANALOG_CTRL)
Connect pin 12 (Analog Control) to pin 9, 11, 13, or 15 (ground) to enable analog I/O pro-
gramming.
b. External Voltage and Current Programming (V_Ref and C_Ref)
Twist the voltage programming signal V_Ref (pin 3), Current Programming signal C_Ref (pin
1) and ground (pin 9, 11, 13, or 15). Configure Analog I/O switch positions 1 and 2 to use
either voltage or resistance as the programming source. Factory default for full scale output
is 10V or 10 Kohms (see PAR. 4.3.3 to set lower values for full scale output).
c. Voltage and Current Readback (VOLT_RBACK and CURR_RBACK)
Twist the voltage readback signal VOLT_RBACK (pin 6), Current readback signal
CURR_RBACK (pin 7) together with ground (pin 9, 11, 13, or 15). Full scale readback volt-
ages are identical to selected full scale programming voltages (see PAR. 4.3.3).
d. Remote Inhibit (REM_INH)
Twist remote inhibit (pin 8) together with ground (pin 9, 11, 13, or 15). See PAR. 3.2.17.3.1 to
configure active high or low and PAR. 3.2.6 to enable/disable the output using remote inhibit.