Showa 5683, Operation Manual

Page: 30 / 68

３−９
3.6 Case
3.6.1 Names of Case Elements
Fig. 3-7
・
Use standard AC power cord (47326) that is attached to the case as a standard for 100 VAC
power supply.
・
Use optional DC power cord (47229) for DC power supply.
3.6.2 How to Use Case
A) Power supply cable connection
When using a battery (12 VDC, or 10 to 30 VDC) for power supply with amplifier units being
installed in a case, take into account the voltage drop caused by the DC power cord length and
wire diameter. When using several channels or a long power supply cord, a voltage drop
occurs. This voltage drop may cause the power supply voltage to be lower than the allowable
power supply voltage of 10 V at DC power input connector.
For example, the DC power supply cord (47229) has a core area of 1.25 mm
2
. If eight
amplifiers are mounted, a current of 3.2 A (0.4 A x 8) flows, and a voltage drop of 0.5 V will
occur if the cord is extended to 10 m. If a 10-m cable with 0.75 mm
2
is used, a voltage drop of
1.65 V will occur. For use under such conditions, the power supply should be provided with the
voltage drop taken into account, or the wire diameter or cord length of the power cord should be
modified.
B) Synchronization between units
When two or more amplifier units are installed in a case, unit synchronization is maintained by
the internal wiring inside the case and synchronization signal. One amplifier should be set to be
the master, and others should be set to be slaves. To set the unit to be the master, set
synchronization switch 2 on the rear face panel to INT; to set to the slaves, set the switch to
EXT. Note that only amplifier units that have the same bridge power frequency can be installed
in a case. It is impossible to share a common case or synchronize between cases that have
amplifiers installed with different bridge power frequencies. Take notice that the bridge power
frequency of Model 5683 is 5 kHz and that of Model 5684 is 25 kHz.
Do not set two or more units to INT. Otherwise correct measurement cannot be made, or this
may cause a defect in amplifier units.
AC Power Input
Ground terminal Interface Connector
DC Power Fuse
AC Power Fuse
DC Power Input
CAUTION