Some DC power supplies are based on a chopper circuit that operates at a 100 kHz
frequency. Avoid using such power supplies with WMT700. The measurement can be
distorted by the ripple in the DC output.
4.10.1 Operating Power
WMT700 can use any 9 ... 36 V (nominal voltage 24 V) minimum 2 W DC power supply that
meets applicable safety regulations. Connect heating supply wires to the ground in case
heating is not used. The typical current and power consumptions vs. operating voltage are
shown in the following figures. Note that the selected heating option aects the needed
operation voltage when separate powering for operation and heating is used.
Do not use a DC power supply based on a chopper circuit that operates at 100 kHz. The
ripple in the DC output can distort the measurement.
Table 28 Operating Power Supply Voltage Requirements
Used Heating Option Operating Power Supply
Transducers 12 … 36 VDC 30 W
Transducers and arms 14 … 36 VDC 150 W
Transducers, arms, and body 16 … 36 VDC 250 W
Figure 32 Wiring of Non-heated WMT700 Versions
Chapter 4 – Installation
77
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