Strain Guage Indicator: 409-W
REF NO: m59A/om/501
Issue NO: 03
Page 15 of 34
7. Alarm Operation
7.1
Alarm type
HH-high, very high AL1-high, AL2-very high
HL-high, low AL1-low, AL2-high.
LL-very low, low AL1-very low, AL2-low.
This setting is common for all groups.
7.2
Status of ALARM/TRIP
It will toggle between ALARM and TRIP depending up on selection in menu.
ALARM mode is further subdivided into Alarm with Latch and Alarm without Latch.
TRIP is useful when the relay is used for tripping the plant or device and it is not to
be started once again. Open condition is treated as normal condition in TRIP type.
7.3
Latching of ALARM
This is used for latching of discrete LEDs and relay status when alarm limit is
crossed. This option will keep discrete LEDs/Relay latched even after channel has
come to normal status until ENTER (ACK) key is pressed. This option can be
changed to YES or NO for enabling or disabling respectively. When configurations
of Alarms are of TRIP type, these parameters will be skipped from display. Different
conditions for the ALARM/TRIP have been mentioned in the following table 7.4,
7.5, 7.6, 7.7.
7.4
HH Logic
Fig 7.1
HH-high, very high. AL1-high, AL2-very high
AL1-High, AL2-Very High
SP2>SP1
If PV>SP1 but, less than SP2 => Relay 1- ON, Relay 2-OFF.
If PV<SP1-Hyst1 => Relay 1-OFF, Relay 2-OFF.
PV>SP2 => Relay1 and Relay2 both are ON.
