Table of contents
SITRANS LUT400
Operating Instructions, 07/2019, A5E33329501-AC
5
7.2.3 Relay behaviour under fail-safe conditions ............................................................................. 87
7.2.3.1 Alarm relays ............................................................................................................................ 87
7.2.3.2 Pump relays ............................................................................................................................ 88
7.2.3.3 Miscellaneous relays............................................................................................................... 88
7.2.4 Relay states ............................................................................................................................ 89
7.2.4.1 Relay output logic ................................................................................................................... 89
7.2.4.2 Relay related parameters ....................................................................................................... 89
7.2.5 Relays controlled by HART Communications ......................................................................... 91
7.3 Discrete Inputs ........................................................................................................................ 91
7.3.1 Backup Level Override ........................................................................................................... 91
7.3.1.1 Basic operation ....................................................................................................................... 92
7.3.1.2 Backup Level Override parameters ........................................................................................ 92
7.3.1.3 Level Override conditions ....................................................................................................... 92
7.3.1.4 Effect of Backup Level Override ............................................................................................. 93
7.3.1.5 Additional considerations ........................................................................................................ 93
7.3.2 Pump Interlocks ...................................................................................................................... 93
7.3.3 Switch (DI) Alarm .................................................................................................................... 93
7.3.4 Discrete Input Logic ................................................................................................................ 93
7.4 mA Control .............................................................................................................................. 94
7.4.1 mA output ................................................................................................................................ 94
7.4.2 Verifying the mA range ........................................................................................................... 95
7.5 Volume .................................................................................................................................... 95
7.5.1 Readings .................................................................................................................................
95
7.5.2 Vessel Shape and Dimensions ............................................................................................... 95
7.5.3 Characterization chart ............................................................................................................. 97
7.5.3.1 Example chart (with 15 of possible 32 Level and Volume breakpoints defined): ................... 97
7.6 Alarms ..................................................................................................................................... 99
7.6.1 Set the common parameters .................................................................................................. 99
7.6.2 Level ..................................................................................................................................... 100
7.6.3 In-bounds/ Out-of-bounds Range ......................................................................................... 100
7.6.3.1 Example: Setting an In-bounds Level Alarm ........................................................................ 100
7.6.3.2 Example: Setting an Out-of-bounds Level Alarm ................................................................. 101
7.6.4 Temperature ......................................................................................................................... 101
7.6.5 Switch (Discrete Input) Alarm ............................................................................................... 102
7.6.6 Fail-safe Fault Alarm ............................................................................................................. 102
7.6.7 Flowrate ................................................................................................................................ 103
7.7 Pump Control ........................................................................................................................ 103
7.7.1 Pump Control options ........................................................................................................... 103
7.7.1.1 Pump Control algorithms ...................................................................................................... 104
7.7.2 Setting a pump down (wet well) group.................................................................................. 104
7.7.2.1 Set the common parameters ................................................................................................ 105
7.7.2.2 Set Relays to ALTERNATE DUTY ASSIST (ADA) ............................................................... 105
7.7.2.3 Set the ON Setpoints ............................................................................................................ 105
7.7.2.4 Set the OFF Setpoints .......................................................................................................... 106
7.7.3 Other Pump Control algorithms ............................................................................................ 106
7.7.3.1 Set Relays to ALTERNATE DUTY BACKUP (ADB) ............................................................. 106
7.7.3.2 Set Relays to FIXED DUTY ASSIST (FDA) ......................................................................... 107
7.7.3.3 Set Relays to FIXED DUTY BACKUP (FDB) ....................................................................... 107
7.7.3.4 Set Relays to SERVICE RATIO DUTY ASSIST (SRA) ........................................................ 108
7.7.3.5 Set Relays to SERVICE RATIO DUTY BACKUP (SRB) ...................................................... 109
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