General Introduction - Siemens SITRANS L 7ML5400 Operating Instructions Manual

7.2.1

General introduction

Three relays are provided on the SITRANS LUT400. Each relay may be independently assigned
to one function (one or more functions for alarms), and has a corresponding status icon on
the LCD.
①
②
Mode
alarm
pump
miscellaneous
Relay contact operation is NORMALLY CLOSED for alarms and NORMALLY OPEN for controls.
Options
* Icon will not display for relay or DI that is not programmed.
In software, all relays are programmed the same way, with ON setpoints indicating when to
change the relay contact state (open or closed). Some parameters allow the reversal of the
operation so that relay contacts can be NORMALLY CLOSED or NORMALLY OPEN (for example,
when assigned to an alarm).
SITRANS LUT400
Operating Instructions, 04/2021, A5E33329501-AG
Relay icons:
Relay 1, 3 programmed
Relay 2 not programmed*
Relay 1 active
Relay 3 inactive
* Icon will not display for relay or DI that is not programmed.
Discrete Input icons:
DI 1, 2 programmed
DI 1 off
DI 2 on
Function (in normal state)
alarm ON = LCD icon ON = relay coil de-energized
pump ON = LCD icon ON = relay coil energized
contact closed = LCD icon ON = relay coil energized
Default Alarm Contact
* Normally Closed
Normally Open
General Operation
Pump or Control Contact
Normally Open
Normally Closed
7.2 Relays
85