Siemens LU01 instruction manual Relays P100 to P119, P072 Failsafe Level Advance, Relay reaction

Relay reaction

The way in which relay programming reacts to the failsafe level depends on P129 Relay Failsafe (page 46). By default:

•Alarm relays have P129 = OFF and so react to the Failsafe Material Level.

•Control relays have P129 = dE and so de-energize the relay when the unit enters Failsafe mode regardless of the Failsafe Material Level.

P072 Failsafe Level Advance

Sets the speed the SITRANS LU01 advances to and returns from the Failsafe Material Level.

	1	*	Restricted	Advances to/from Failsafe Material Level as set by
				P003, P700 and P701.
Values
	2		Immediate	Failsafe Material Level assumed immediately
	3		Fast Back	Failsafe Level Advance is restricted, return is
				immediate
	•	P003 Maximum Process Speed
	•	P070 Failsafe Timer
Related	•	P071 Failsafe Material Level
	•	P700 Max Fill Rate
	•	P701 Max Empty Rate

Relays (P100 to P119)

The SITRANS LU01 has four relays (or digital outputs) used to control devices and alarms. While the number of devices is limited by the relays, all control functions are accessible through software and each parameter is indexed to the relays.

The SITRANS LU01 makes standard application programming easier by providing an extensive list of presets in P100 (Preset Applications).

Standard alarms are set from P101 to P104. In the RUN mode, when the material level:

•rises to a High or High High Alarm value, the associated Alarm and Relay Status indicators are displayed and the allocated relay(s) de-energize.

•falls 5% of Span (P007) below the High or High High Alarm value, the associated Alarm and Relay Status indicators extinguish, and the allocated relay(s) energize.

•falls below the Low or Low Low Alarm value, the associated Alarm and Relay Status indicators are displayed and the allocated relay(s) de-energize.

•rises 5% of Span (P007) above the Low and Low Low Alarm value, the associated Alarm and Relay Status indicators extinguish, and the allocated relay(s) energize.

Note: Enter all standard alarm material level values in Units (P005) or percent of Span (P007) as referenced to Empty (P006).

To display the current value (or enter a new value) in percent of Span, press as required to display the % symbol.

Control functions allow each relay to be configured independently to take advantage of the SITRANS LU01’s advanced features and flexibility. Start with a preset application and then change the required parameters to make the task more efficient.

7ML19985BE02 SITRANS LU01 – INSTRUCTION MANUAL Page 39

Parameters