KEPCO KLN Series (750W, 1500W, 3000W), Main Contro Firmware Version 1.70 and higher - Manual (Page 74)

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KLN Series 051614
3.4.3 PARALLEL OPERATION
• The front panel current displays of the Master and Slave(s) each show the output current of
the individual units. The front panel voltage display of the Master shows the output voltage
for the parallel combination.
• Front panel keys of slave(s) are disabled, except that SHIFT and ENTER keys still allow
access to the MENU functions (see PAR. 3.2.2) and SHIFT V (OVP) still allows OVP of the
slave to be modified (see PAR. 3.3.2).
• The voltage monitoring function at pin 20 (V MON) of the Control Programming port is func-
tional for the Master and all Slaves, 0 - 10V corresponding to 0 to full scale voltage of each
individual unit.
• The current monitoring function at pin 22 (A MON) of the Control Programming port is func-
tional for Master and all Slaves, 0 - 10V corresponding to 0 to full scale current of the indi-
vidual units. Current monitor for the parallel combination is the sum of the output of pin 22 of
the Master, plus pin 22 of all Slaves.
• The alarm status function at pin 9 (ALARM) of the Control Programming port is functional for
Master and all Slaves. If the Master alarm status is active, the Master and all Slaves will be
shut down. If a Slave alarm status is active, only that Slave will be shut down.
• Remote sensing for Slave units is disabled when operating in parallel configurations.
• When using remote digital control, only the MASTER can be operated and controlled by
remote commands.
To operate units connected in parallel, proceed as follows:
1. Verify that the units are connected as shown in either Figure 2-21A (with local compensa-
tion) or Figure 2-21B (with remote compensation).
2. Verify that Programming Control Port connections are as shown in either Figure 2-21 (using
the optional Parallel Connector Board shown in Figure 2-22), or Figure 2-23 (direct connec-
tions).
3. Turn on power to Master unit first, then Slave units.
4. Set menu function for Ramp Down Time of both Master and Slave to 0 (see PAR. 3.3.11).
5. Set PSOP (Parallel/Series operation) function in the menu to PM (Parallel Master) for the
Master unit and to PS (Parallel Slave) for the Slave unit (see PAR. 3.3.37). After setting
PSOP, output ON/OFF of the series combination is controlled by the Master.
6. Set OVP and OVC of the Slave(s) to a higher value than that for the Master to ensure that
overvoltage and overcurrent protection work properly.
7. When powering off a parallel combination, first turn off the Slave(s), then the Master.