- 10 -
ОМ-310
NOVATEK-ELECTRO
12 – button
(marked in text as UP) – used to scroll through indicated parameters in the parameter view mode and
scroll through menus in the parameter setup mode
13 – button
(marked in text as DOWN) – used to scroll through indicated parameters in the parameter view mode and
scroll through menus in the parameter setup mode
14 – key – RES/MEM/SEL – used to record parameters in setup mode; switch between groups of parameters displayed
in view mode, reset
15 - SETUP button engages the parameter setup mode
Figure 1.1
- OM-310 device controls and dimensions
N o t e
1 -
In order to enhance the ОМ
-310 reliability, for the mains voltage input, terminals with 7.5 mm spacing
were used. Standard contact numbering on the device case (5 mm) does not agree with such terminals, that is why
terminals in figure 2.1 are marked with intermediate values.
N o t e
2
–
LEDs 10 and 11 glow simultaneously when the ОМ
-310 characterizing relay functions in the watl-
less power excess alarm mode
1.2.5 Power Limiting Functions
1.2.5.1 Assumptions utilized in power limiter function description:
a) voltage and current protections are off or corresponding parameters values are within permissible limits;
b) when energized, the load relay will close after AR time (
=1 parameter);
c) time specified by t1n parameter exceeds the AR time (
parameter).
1.2.5.2 Limitation of active power if parameter
not equal 2 (under all relay activity conditions except of us-
ing it for connection of additional loading.
After
ОМ
-310 energizing, after AR time (
parameter) the load relay will close. If during operation the active
power consumed by the load crosses the main threshold for a time that is longer than assigned by “t1n” parameter,
the load relay will open. The load will be energized again after AR period, or after time specified by t1F parameter
(whichever is longer) (Figure 1.2).
The main threshold value and the power overload calculation depend on the “
” parameter value.
When
=0, the load consumed wattage is calculated for each phase separately and is compared with the
main threshold calculated as:
Main threshold (kW) = (“Pnn” * “P1F”) / (100*3), where
“Pnn” – cumulative rated load wattage, kW;
“P1F” – main threshold, %.
When
=1, the cumulative load power input for all three phases is compared with the main threshold calcu-
lated as:
Main threshold (kW) = (“Pnn” * “P1F”) / 100, where
“Pnn” – cumulative rated load wattage, kW;
“P1F” – main threshold, %.
Simultaneously, the load input power is calculated for each phase separately and is compared with the second
threshold calculated as (threshold calculation for each phase + 20%):
The second threshold (kW) = (“Pnn” * “P1F” *1,2) / (100*3), where
“Pnn” – cumulative rated load wattage, kW;
“P1F” – main threshold, %.
Watt consumption crossing the first and the second thresholds is considered crossing the main threshold.
When
=2, the cumulative load power input is compared with the main threshold calculated as:
Main threshold (kW) = (“Pnn” * “P1F”) / 100, where
“Pnn” – cumulative rated load wattage, kW;
“P1F” – main threshold, %.
Main threshold
Wattage
Load relay
Att – AR time
t1n - time, after which the load relay will open if the watts input crosses the main threshold
