Strain Guage Indicator: 409-W
REF NO: m59A/om/501
Issue NO: 03
Page 16 of 34
If PV<SP2-Hyst2 but, >SP1 => Relay 1-ON, Relay 2-OFF.
Depending up on condition set i.e. Latch Yes/No, Acknowledge Yes/No or Trip refer
table 7.4, 7.5, 7.6, 7.7.
7.5
HL Logic
HL-high,low AL1-low, AL2- high
Fig 7.2.
AL1-low, AL2- High
SP2>SP1
If PV>SP2 then Relay 2-ON.
If PV<SP2-Hyst2 => Relay 2-OFF.
PV<SP1 => Relay1 ON.
If PV>SP1+Hyst1 then. Relay 1-OFF.
Depending up on condition set i.e. Latch Yes/No, Acknowledge Yes/No or Trip refer
tables 7.4, 7.5, 7.6, 7.7.
7.6
LL Logic
LL-low, low AL1- very low, AL2-low.
AL1- very Low, AL2-Low
SP2>SP1
If PV<SP1 then => Relay 1-ON, Relay 2-ON
Relay 1-ON till PV>SP1+HYS1 after that Relay 1-OFF.
