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

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Siemens LC 500, Sitrans instruction manual Factory Settings, Switch Protection Diode, Setting Description