YOKOGAWA DTSXL, User Manual, Page: 41 / 289

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A-18
IM 39J06B40-01EN 14th Edition: May 30, 2022
TIP
The power consumption varies with the installed modules.
- The maximum power consumption of a unit is given by the following equation:
Power consumption of unit = power consumption of base module
+ power consumption of DTSX3000
+ power consumption of additional modules
- The power consumption can then be calculated using the following equation:
Power consumption (VA) = power consumption of unit
/ (efficiency of power supply module x power factor of power supply module)
- The efficiency and power factor of the power supply module varies with usage conditions. Use the
following guidelines to determine their values:
Efficiency of power supply module
= 0.75 (except for NFPW426)
= 0.8 (for NFPW426)
Power factor of power supply module
= 0.5 (when no power factor improvement device is used)
= 1.0 (when NFPW444 or NFPW426 is used.)
CAUTION
- Power failure during writing of files to the system memory of the DTSX3000, say
during program update, may damage the file system. (Power failure during
DTSX3000 operation will not damage the system memory.)
Power failure during measurement may also damage measurement data.
- To prevent such risks, install an uninterrupted power supply (UPS) device.
A3.3. Grounding for DTSXL System
When DTSXL System is installed in a cabinet (with a 19-inch rack), instrument panel, or
the like, it is functionally insulated by the insulation bushings (accessories of DTSBM10).
To maintain this insulation, the following instructions must be followed.
- Ground the DTSXL System separately from the grounding of other devices, motor
control circuits, and electric control circuits.
- Grounding resistance on the FG terminal of the base module must be 100 Ω or
less.
- Grounding resistance on the GND terminal of the power supply module (line filter
grounding) must be 100 Ω or less.
- Perform the grounding of the base module and the power supply module at one
point.
SEE ALSO
For the specification of the grounding wire, see A5.2, “Wiring the Ground.”