Siemens LC 500, Sitrans Factory Settings, Switch Protection Diode, Interconnection, Description

Interconnection

Upper and Lower Threshold, (menus 13 and 14) and the accompanied delays (menus 15 and 16).

Initially the solid-state output is disabled for both signal output and fault/failure output (menu 17). When the solid-state switch is to be operated as fault/failure output (for example, for a separate shutdown system), we recommend disabling the operation for signal output (select Disabled Mode in menu 17 on page 70). There is no delay in the operation for fault/failure output.

Notes:

•The solid-state output should only be used in circuits where the current is limited by a proper load.

•Due to the limited switching capabilities of the solid-state switch component, an auxiliary relay must be applied when switching high-current/high-voltage apparatus.

Switch Protection (Diode)

WARNING: When the solid-state switch is activating an external relay, protection diodes must be connected in the correct polarity across the relay coil to prevent possible switch/relay damage resulting from inductive spikes generated by the relay coil.

Factory Settings

The SITRANS LC 500 has a number of default factory settings. If the required settings for the application are known, the settings can be modified during final testing.

Note: To restore factory settings, use menu item 12 (see Factory Settings on page 72 for details).

Settings:

Setting		Description
ID		Has a unique serial number
TV0	Units	PF
TV0	UL	3300 pF [switch position (0)C]
TV0	LL	1.666 pF [switch position (0)B]
TV0	URV	3300 pF [switch Position (0)F]
TV0	LRV	0.00 pF [switch Position (0)E]
AO1		4-20 mA is 0-100% [position (0)8]
TAG		"customer input data via HART"
DESCRIPTOR		"customer input data via HART"
MESSAGE		"Siemens Milltronics P I"

Page 34 SITRANS LC 500 – INSTRUCTION MANUAL 7ML19985GE01