Simex Simpact SRP-77, Руководство пользователя

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User manual for meter with U/I input SRP-77
6. PRINCIPLE OF OPERATION
After turning the power supply on, device ID and software version are showed on the
display, next the controller goes to the measurement mode.
6.1. MEASUREMENT MODE
In the measure mode, the measurement results, converted over selected characteristic,
are displayed on the LED display. The measurement range equal to the nominal range is
called:
nominal measurement range, and the measurement range equal to the extended
nominal range is called:
permissible measurement range
(Figure 6.1, 6.2).
Figure 6.1. Definitions of measurement ranges in mode 4 ÷ 20mA
If the result of measurement exceeds the permissible measurement range , warning ”-Hi-” or
”-Lo-” is displayed rather than input signal, depends on exceeded value (see description of
“Lo r”
i
“Hi r”
parameters, paragraph
”inPt” menu
).
Figure 6.2. Definitions of measurement ranges in mode 0 ÷ 20mA
If the measurement value do not exceeds
permissible measurement range
but
displayed value exceeds range -999 ÷ 9999, the warning ”-Ov-” is displayed rather
than the calculated result.
The measurement results are displayed on the main display. ”-Hi-” , ”-Lo-” and ” -Ov-”
messages are displayed on the second display. At the same time symbol ” - - - - ” is displayed
on the main display. If the measurement result is in the allowed range , second display is
dimmed or shows one of the relay thresholds (selected threshold is signalized by LEDs
marked
S1 and S2 ). If a free access is enabled (see description of ”SECu” menu ), user can
change the value of particular threshold pressing [ENTER] button (see: PARAMETERS
EDITION
). After power on second display is dimmed, and it's operation mode can be changed
15
” Lo r ” parameter
” Hi r ” parameter
4 mA 20 mA
permissible measurement range
nominal measurement range
” Hi r ” parameter
0 mA 20 mA
permissible measurement range
nominal measurement range
i