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User Manual
3.9 Clock and Lock Mode (-LKM/-LKS Option)
Clock and lock mode operation of two or more iX AC power sources is available only if the –LKM and
–LKS options have been installed at the factory. With these options installed, it is possible to lock an
auxiliary unit (-LKS) to a master unit (-LKM). The master unit controls the frequency. This
configuration can be used to create multiphase power systems such as split-phase or three phases.
The auxiliary unit must be set to external clock mode from the Control screen. See section 4.2.5.
Two BNC connectors are provided on the rear panel
need to be connected between the master a
outputs. On the auxiliary unit (-LKS), both are inputs. Do not connect these BNC's between two
master units (-LKM's) or damage to the unit could result.
CLOCK
LOCK
CLOCK
LOCK
CLOCK
LOCK
Refer to Figure 3-6 for the required connections between the –LKM and –LKS units. The example is
shown for two units, one master, one auxiliary. More than one auxiliary can be used to create
additional phase outputs. In this case, the BNC cables can be daisy chained using BNC T connectors.
WARNING:
DO NOT CONNECT THE AC OUTPUTS OF THE –LKM AND –LKS UNITS TOGETHER.
CLOCK AND LOCK OUTPUTS CANNOT BE PARALLELED TO OBTAIN HIGHER
OUTPUT CURRENTS.
Do not use clock and lock mode to obtain higher power capability on the same phase(s).
The frequency of the auxiliary unit will track that of the master. The output phase angle of phase 1/A
will be locked to the auxiliary unit as well to within 3°. Phase B and C of each unit will be referenced to
phase A of the same unit. This allows split phase or multi-phase configurations to be created.
California Instruments
COMMON
Master power source (-LKM)
NEUTRAL
Auxiliary power source (-LKS)
Figure 3-6: Clock and Lock Connections
of the iX model for clock and lock mode. Both
nd auxiliary unit. On the master unit (-LKM), both are
2253i / 2253iX
GND NEUT LINE
AC INPUT POWER
47
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