Mitsubishi Electric Melsec Q Series User Manual page 31

4 Functions
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
Alarm item
(Un\G11/Un\G21)
Alarm value
(Un\G12,13
/Un\G22,23)
Alarm reset method
(Un\G14/Un\G24)
Alarm delay time
(Un\G15/Un\G25)
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),
(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.
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.
Setting range
0: No monitoring
1: Current demand upper limit
2: Current demand lower limit
3: Voltage upper limit
4: Voltage lower limit
5: Power demand upper limit
6: Power demand lower limit
7: Power factor upper limit
8: Power factor lower limit
-2147483648 to 2147483647
[Unit] Current:×10
Voltage:×10
Power:×10
PF:×10 -3 %
0: Self-retention
1: Auto reset
0 to 300
[Unit] second
alarm reset
Figure 4.2.4-1 Time chart of alarm monitoring setting
For respective alarm 1 and alarm 2,
set the measuring item and either
upper or lower limit for monitoring
target.
The value to be monitored for the
-3 A alarm. Set the value according to the
-3 V unit of the measuring item that is set
kW as an alarm monitoring item.
-3
(Double words)
Set
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.
If it exceeds the upper limit alarm
value or if it goes below the lower limit
alarm
continues for the period of the alarm
delay time, then it is considered as an
alarm occurrence.
method (Un\G14/Un\G24),
4 - 13
QE81WH
Description
whether or not
value, and the situation
and alarm delay
the
time