Sequoia / Tahoe Series User Manual California Instruments
M447352-01 REV-A 63
3.8.6 Multiple Chassis System Configurations
The Sequoia / Tahoe power source has the capability to be configured in multi-chassis groups with
multiple-phase outputs using the optional Clock/Lock signal interface. The sources are individually
programmed for output voltage/current, while the Clock/Lock interface ensures frequency and phase
synchronization between units.
The power source could also be configured in parallel, multiple-chassis groups to extend the total output
power. The outputs of the individual units must be connected in parallel, and a Leader/Follower System
interface cable must interconnect them. The control interface of the units is automatically configured when
the Leader/Follower System interface cable is connected, so no setting changes by the user are required.
3.8.6.1 Multi-Phase System
The connections to set up a multi-phase group of units require the output lines, PHASE-A, PHASE-B,
PHASE-C, and RTN to be connected independently from each output of a unit to the load. If the remote
sense is used, each unit must have it connected to the phase of the load at the point where precise
regulation of the output voltage is desired.
The units must have the Clock/Lock options installed, with the Leader unit having the LKM option and the
Auxiliary units having the LKS option. The Clock/Lock connectors of the Leader unit provide output signals:
CLOCK to set the frequency, and LOCK to set the phase. The Clock/Lock connectors of the Auxiliary units
are inputs to accept the control signals from the Leader unit. The Clock and Lock interfaces are signal
buses, so the Clock connectors of all units must be connected, and the Lock connectors must be connected
together. Programming, readback, and control are done through the individual units. Also, the Auxiliary
units must have their phase programmed in reference to the Leader unit. Refer to Figure 3-19 for an
example configuration.
The clock source and configuration must be set for multi-phase operation through the remote digital
interface using SCPI commands or the front panel display. Set up through the front panel is as follows:
In the CONFIGURATION, PONS CLOCK CONFIG display menu, the Leader unit must have the
configuration set to Master (the AC input must be cycled off/on for a change in a PONS setting to take
effect); refer to Section 5.6.7.
1. In the CONFIGURATION, PONS CLOCK CONFIG display menu, the Auxiliary units must have
the configuration set to Auxiliary (the AC input must be cycled off/on for a change in a PONS
setting to take effect); refer to Section 5.6.7.
2. In the CONFIGURATION, CLOCK MODE display menu, the Auxiliary units must have the clock
source set to External; refer to Section 5.6.7.
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