Sequoia / Tahoe Series User Manual California Instruments
64 M447352-01 REV-A
3.8.6.2 Parallel System
The connections to set up a parallel group of units require the output lines PHASE-A, PHASE-B, PHASE-
C, and RTN to be connected together from each unit to an external terminal block. If the remote sense is
used, only the Leader unit has it connected to the load at the point where precise regulation of the output
voltage is desired; the follower unit does not have remote sense connected. The Leader/Follower System
Interface cable is connected from the Leader unit connector, LEADER, to the Follower unit connector,
FOLLOWER. Refer to Figure 3-17 for an example configuration.
The aggregate output power of the parallel group would be the sum of the individual ratings of the Sequoia
/ Tahoe models connected in parallel. The maximum aggregate power allowed by paralleling the power
sources is limited to 540 kVA.
The Leader/Follower interface is automatically configured so that the current reported by the Leader unit
is the sum of all units within the group. The display of the Follower unit is disabled, and shows the message,
“SOURCE IN FOLLOWER MODE No access to the user”.
When the parallel group system is powered up, the order of powering the Follower source and the Leader
source is not important. After the system is powered up, if a Follower power source is powered down there
will be an error message displayed on the Leader source, “Follower Down ensure all are powered up”. If
power is reapplied to the Follower source, the message will disappear, and normal operation could resume.
If the Leader/Follower System Interface cable is removed from the Follower source while the source is
powered down, the error message will disappear, but the Leader source will not have the correct
configuration. The Leader source must have its AC input power toggled, Off to On, for the correct
configuration to be re-established.
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