Chapter 10 • Alarms
10-8
Rev. 6, March 2011
Part 17997
status of the gas alarms. Each push-button turns on when the corresponding alarm is
triggered. The push-button’s alarm indicator is latched; in other words, it remains on
even if the alarm condition has disappeared and even if the alarm is acknowledged
(using the H201T
i
’s keypad or the Hydran Host software). To turn it off, you must
press the corresponding push-button; an alarm indicator can only be turned off if the
alarm condition has disappeared during a period of time exceeding the corresponding
alarm delay (one of the alarm parameters). Table 10-3 on page 10-8 lists the possible
states of the Hydran 201C
i
-1’s display and alarm indicators.
Table 10-3 - Possible States of the Hydran 201C
i
-1’s Display and Alarm Indicators
6.
During a fail alarm, the Hydran 201C
i
-1’s display is blank (see Table 10-3 on
page 10-8), and the analog outputs of the H201T
i
and the H201C
i
-1 drop to 4.00
± 0.10 mA.
7.
A message is recorded in the H201T
i
’s
History;Events
file. Alarm messages are thus
stored in memory. The Events file can contain up to 500 messages. Each message
comes with a set of relevant parameters (gas level, trends, etc.) and is identified with
the recording date and time. For details, see Section 4.5.1 on page 4-12.
10.4
GAS HIGH AND HIGH-HIGH ALARMS
Parameters pertaining to gas High and High-High alarms are set in the Hydran 201T
i
’s
Gas
submenu. For explanations on each parameter, see Section 4.5.2 on page 4-16.
Set points for High alarms should be adjusted at values that indicate that the transformer (or
other equipment) requires
closer monitoring
. Set points for High-High alarms should be
adjusted at values considered as critical by the user, meaning that the transformer requires
immediate action
; in general, this alarm implies an evaluation of the equipment and its
possible removal from service.
State
Display
High Indicator
High-High Indicator
Normal
Normal
Off
Off
High alarm
On (Latch)
High-High alarm
On
On (Latch)
Fail alarm
Off
Unchanged
Unchanged
Power failure
Off
Off
Содержание Hydran 201i
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Страница 36: ...Chapter 1 Introduction 1 10 Rev 6 March 2011 Part 17997 PAGE LEFT INTENTIONALLY BLANK ...
Страница 72: ...Chapter 3 Hydran 201Ci Controllers 3 16 Rev 6 March 2011 Part 17997 PAGE LEFT INTENTIONALLY BLANK ...
Страница 114: ...Chapter 5 Before Installation 5 16 Rev 6 March 2011 Part 17997 PAGE LEFT INTENTIONALLY BLANK ...
Страница 143: ...Installation Part 17997 Rev 6 March 2011 6 29 Figure 6 9 Installing the CPU Module ...
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Страница 216: ...Chapter 11 Operating the Hydran 201i System 11 8 Rev 6 March 2011 Part 17997 PAGE LEFT INTENTIONALLY BLANK ...
Страница 236: ...Chapter 12 Troubleshooting 12 20 Rev 6 March 2011 Part 17997 PAGE LEFT INTENTIONALLY BLANK ...
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Страница 254: ...Appendix B Mechanical Drawings B 2 Rev 6 March 2011 Part 17997 Figure B 3 1 5 In Adaptor ...
Страница 255: ...Hydran 201Ti Intelligent Transmitter Part 17997 Rev 6 March 2011 B 3 Figure B 4 1 In Adaptor ...
Страница 262: ...Appendix C Functional Block Diagrams C 4 Rev 6 March 2011 Part 17997 PAGE LEFT INTENTIONALLY BLANK ...
Страница 282: ...Appendix F Default Values of the Parameters F 4 Rev 6 March 2011 Part 17997 PAGE LEFT INTENTIONALLY BLANK ...
Страница 284: ...Appendix G Unit Conversions G 2 Rev 6 March 2011 Part 17997 PAGE LEFT INTENTIONALLY BLANK ...
Страница 298: ...Appendix I Glossary I 12 Rev 6 March 2011 Part 17997 PAGE LEFT INTENTIONALLY BLANK ...
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