Set Alarm Hold - Mitsubishi Electric MELPRO S Series Operation Manual

4.6.6.

Set ALARM HOLD

There is ALARM HOLD setting for the self-diagnosis function.
When the self-diagnosis function detects some error, the protection relay goes to error condition. The
behavior under the error condition is shown in Table 4-3.
In case of ALARM HOLD = OFF, the protection relay try to recover. However the behavior of the Error
condition is continued when the error cannot cleared.
RUN LED
Items
Normal
ON
condition
Error condition OFF
After recovering
from error with
ON
ALARM HOLD
= OFF
After recovering
from error with
OFF
ALARM HOLD
= ON
Table 4-3 Protection relay behavior in alarm condition
ALARM
LED
(green)
(red)
OFF
ON
OFF
ON
Turn Switch-3 to ALARM
HOLD (position 11).
The current setting value is
indicated.
This example shows "OFF" as
a setting value.
After showing current setting
value, all LEDs are blinking.
You can select new value
using Switch-4.
Alarm
Protection
Contact
element
Output
OFF Enable
Lock
ON
(disable)
OFF Enable
Lock
ON
(disable)
34 / 47
Others
−
Save error code (Refer to clause
4.10.)
If the intermittently or temporarily
fault conditions is occurred, the
protection relay could recover
after the error cleared.
If the error cannot cleared, the
behavior of the Error condition is
continued.
Regardless of the cause of
errors the relay holds (keeps)
the condition at that time of the
error detection.
To recover from the error
condition, please try push
"INDICATOR RESET" button or
restart the protection relay by
auxiliary power off.
JEP0-IL9537