Yokogawa DA100 - Manual (Page 83)

IM DA100-01E 4-14
4.4 Specifications of Power Monitor Module
Style Number: S5
Model Code, Use (Input Channels), Terminal Configuration and Shortest
Measurement Interval
Model Code Use (Input Channels) Terminal Shortest
Configuration Measurement Interval
DU400-12 Single-phase Clamp* 2 s
(one channel each for voltage and current)
DU400-22 Three-phase Clamp*, ** 2 s
(three channels each for voltage and current)
*: Two-terminal pressure clamping
**: Not usable as an equivalent to three modules of single-phase use
Method of Input
Transformer-isolated input, with isolation between channels (separated channels)
Method of Measurement and Computing
Digital multiplication
Measuring Ranges
Voltage: 25 or 250 Vrms
Current: 0.5 or 5 A
In three-phase measurement or single-phase three-wire measurement, the current/voltage ranges
are identical between the respective phases or lines (the current/voltage ranges are set in common
between the respective channels).
Measured Frequency Range
45 to 65 Hz
Wiring Methods
DU400-12: Single-phase two-wire
DU400-22: Single-phase two-wire, single-phase three-wire, three-phase three-wire (dual-voltage,
dual-current), three-phase three-wire (triple-voltage, triple-current) and three-phase four-wire
Measured Data Items
For each module, a maximum of six data items can be selected from the effective voltage,
effective current, active power, apparent power, reactive power, frequency, power factor and
phase angle. The selected data items can then be assigned to channel numbers xx1 to xx6 to show
them on the display as well as record them. Restrictions apply to the combination of selectable
data items, however, depending on the method of input wiring.
Conditions of Measurement
• Measuring range for current and voltage inputs
10% of the measuring range < current and voltage inputs
≤ 100% of the measuring range
• V1 range is monitored in frequency measurement
• All measurements are done relative to the frequency on a channel for V1 and, therefore, the
results of measurements are not guaranteed if the V1 input is out of the range noted above.
• If the input apparent power falls below 10% of the span, the DR recorder cannot measure the
phase and power factor (negative overflow).
• A maximum of two scans' worth of data become invalid immediately after a change has been
made to the measuring range and/or wiring.