YOKOGAWA YS1000 Series, Руководство пользователя

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4-1
IM 01B08D02-02EN
Processing during Power Failures
4
4.1 Processing during Power Failures
Description
YS1310 enters a power failure status if a momentary power interruption of about 20 ms
occurs in the case of 100 V AC supply voltage, or if that of 1 ms or more occurs in the
case of 24 V DC. The operation to be taken after power is restored can be set.
Data storage
YS1310 data can be stored by making a setting with keystrokes or by making a setting
using communication through YSS1000 Setting Software. Data to be stored are the
setting parameters, event display data. Trend data displayed on a TREND Display will be
lost in the event of a power failure.
Operation after power restoration
The operation to be taken after power restoration depends on the duration of the power
failure and the operation mode that the YS1310 is in after power restoration (Start mode
(START), engineering parameter).
Start Mode (START) Power Failure Duration
Less than about 2 seconds About 2 seconds or more
AUT HOT start
COLD
HOT start COLD start
Operation in Each Start Mode
Start Mode (START)
HOT Start COLD Start
First-order lag dead time Continued as is Initialization
Process alarms, and system alarms Continued as is OFF
DO1 to DO6 Continued as is OFF
Chapter 4 Processing during Power Failures