4 Functions
QE81WH4W
4.2.4 Upper/lower limit alarm monitoring function
You can set an upper and lower limit alarm for maximum two points and implement a monitoring
function for them. During the alarm monitoring, it can monitor the input signal to check for the
occurrence.
(1) Setting the upper/lower limit alarm monitoring
1) Setting items and setting range for the alarm monitoring are described below.
Items set in the buffer
memory
Setting range
Description
Alarm item
(Un
\
G11/Un
\
G21)
0: No monitoring
1: Current demand upper limit
2: Current demand lower limit
3: Voltage (L-L)upper limit
4: Voltage (L-L)lower limit
5: Power demand upper limit
6: Power demand lower limit
7: Power factor upper limit
8: Power factor lower limit
9: Voltage (L-N) upper limit
10: Voltage (L-N)lower limit
For respective alarm 1 and alarm 2,
set the measuring item and either
upper or lower limit for monitoring
target.
Alarm value
(Un
\
G12,13
/Un
\
G22,23)
-2147483648 – 2147483647
[Unit] Current:×10
-3
A
Voltage:×10
-3
V
Power:×10
-3
kW
PF:×10
-3
%
The value to be monitored for the
alarm. Set the value according to the
unit of the measuring item that is set
as an alarm monitoring item.
(Double words)
Alarm reset method
(Un
\
G14/Un
\
G24)
0: Self-retention
1: Auto reset
Set whether or not the
alarm-occurrence condition should be
retained if the value goes below the
upper limit alarm value or goes over
the lower limit alarm value after the
upper/lower limit alarm occurred.
Alarm delay time
(Un
\
G15/Un
\
G25)
0 – 300
[Unit] second
If it exceeds the upper limit alarm
value or if it goes below the lower limit
alarm value, and the situation
continues for the period of the alarm
delay time, then it is considered as an
alarm occurrence.
2) Setting procedures are as follows:
(a) Check that Operating condition setting request (Yn9) is OFF.
(b) Set the alarm item in the buffer memory (Un
\
G11/Un
\
G21), alarm value (Un
\
G12,13
/Un
\
G22,23), alarm reset method (Un
\
G14/Un
\
G24), and alarm delay time
(Un
\
G15/Un
\
G25). For the address of buffer memory corresponding the alarm1 and
alarm2, refer to Chapter 6.
(c) Set Operating condition setting request (Yn9) to ON. Operation starts at each set value,
and then, Operating condition setting completion flag (Xn9) is turned ON.
(d) Check that Operating condition setting completion flag (Xn9) becomes ON, and then set
Operating condition setting request (Yn9) to OFF. Operating condition setting completion
flag (Xn9) will be turned OFF.
Figure 4.2.4-1 Time chart of alarm monitoring setting
Operating condition setting request (Yn9)
Operating condition setting completion flag (Xn9)
3) Each item of the alarm monitoring is stored in the nonvolatile memory, so that values can be
retained even at a power source reset.
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