47113964.2.023РЭ
10
Table 7
Name of influencing magnitude
Value of influencing
magnitude
Variation, %
of the fiducial value
Ambient Air Temperature
for measurable current and voltage
for measurable power
for measurable frequency
- 40 to 55
°
C
±
0.1 on 10 °С of temperature var-
iation
±
0.2 on 10 °С of temperature var-
iation
±
0.02 on 10 °С of temperature vari-
ation
Relative Humidity
for measurable current and voltage
for measurable power
for measurable frequency
to 95% at 25 °С
±
0.2
±
0.5
±
0.02
External magnetic field of frequency
45 … 65 Hz by strength
for measurable current and voltage
for measurable power
for measurable frequency
to 400 A/m
±
0.2
±
0.5
±
0.04
1.2.10 Rate of exchange (from 1200 to 76800 bps).
1.2.11 Intrinsic error corresponds to 1.2.4:
–
on the expiry of a setup time;
–
when auxiliary supply voltage fluctuating from 187 up to 242 V; auxiliary supply frequency fluctuating
from 48 up to 52 Hz;
–
under effecting sine-wave vibrations in a frequency band from 10 up to 55 Hz with displacement
amplitude 0,15 mm.
1.2.12 Transducer withstands following overloads by input signals:
- for voltage inputs: the twofold nominal value applied for 2 h;
- for current inputs:
- the sevenfold nominal value applied for 15 s and repeated two times at 60 s interval;
- the tenfold nominal value applied for 5 s and repeated two times at 10 s interval;
- the twentyfold nominal value applied for 1 s and repeated 5 times at 300 s interval.
1.2.13 Transducers are satisfied to the electromagnetic compatibility requirements for grade
«A» equipment according with ГОСТ Р 51522.
1.2.14 Isolation of electric circuits concerning the case and amongst current circuits, voltage circuits,
supply withstands a testing voltage of practically sine-wave shape by frequency (50 ± 2) Hz during 1 min:
-
2.5 kV RMS – in standard conditions
;
-
1.5 kV RMS – to 95% R.H. at 35
°
С.
1.2.15 Isolation between independent circuits RS-485(1) and RS-485(2) is tested by approx-
imate sine-wave shape (50 ± 2) Hz voltage during 1 min:
-
0.5 kV RMS – in standard conditions
;
-
0.3 kV RMS – to 95% R.H. at 35
°
С.
1.2.16 Electrical insulation resistance of circuits pointed in 1.2.14 and 1.2.15 is not less:
- 40 М
Ω
- in standard conditions;
- 10 М
Ω
- to 80% R.H. at 55
°
С;
- 2 М
Ω
- to 95% R.H. at 35
°
С.
