janitza UMG 804, Руководство по установке, Страница: 32 / 36

32
Voltage measurement
The voltage measurement inputs are suitable for measurements in the following
power supply systems
Three-phase 4-conductor systems with
nominal voltages up to
480 VAC
Three-phase 3-conductor systems,
unearthed, with nominal voltages up to
277 VAC
From a safety and reliability perspective, the voltage measurement inputs
are designed as follows
Overvoltage category
230V: CAT II 24 V: CAT III
Protection of voltage measurement Impedance limited plus clamping diodes
/ MOV
Measurement range L-N 0 .. 277 VAC
Measurement range L-L 0 .. 480 VAC
Resolution 0.01 VAC
Crest factor 1.9 @ 240 VAC
Impedance 2.5 MΩ
Power consumption <0.1 A @ 277 VAC (< 3 W)
Sampling rate 40 kHz
Frequency range of the fundamental oscillation 40 .. 70 Hz
Digital inputs
Quantity 2
Note:
two inputs for dry contacts