Eurotherm 3116 PID User's Guide Page 64
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3100/3200 Series
62 Part No HA028651 Issue 3.0 Mar-06
12.2 Behaviour of Alarms After a Power
Cycle
The response of an alarm after a power cycle depends upon
the latching type, whether it has been configured to be a
blocking alarm, it's state and the acknowledge status of the
alarm.
The response of active alarms after a power cycle is as
follows:
For a non-latching alarm or an event alarm blocking will be
re-instated, if configured. If blocking is not configured the
active alarm will remain active. If the alarm condition has
gone safe during the down time the alarm will return inactive.
For an auto-latching alarm blocking will be re-instated, if
configured, only if the alarm had been acknowledged prior to
the power cycle. If blocking is not configured or the alarm
had not been acknowledged the active alarm will remain
active. If the alarm condition has gone safe during the
downtime the alarm will return inactive if it had been
acknowledged prior to the power cycle else it will return safe
but not acknowledged. If the alarm was safe but not
acknowledged prior to the power cycle the alarm will return
safe but not acknowledged.
For a manual-latching alarm blocking will not be re-instated
and the active alarm will remain active. If the alarm condition
has gone safe during the downtime the alarm will return safe
but not acknowledged. If the alarm was safe but not
acknowledged prior to the power cycle the alarm will return
safe but not acknowledged.
The following examples show graphically the behaviour
under different conditions:-
12.2.1 Example 1
Alarm configured as Absolute Low; Blocking: No Latching
12.2.2 Example 2
Alarm configured as Absolute Low; Blocking: Manual
Latching
12.2.3 Example 3
Alarm configured as Absolute Low; Blocking: Auto Latching
PV
Alarm
SP
Power
on
Power
off/on
Power
off/on
Alarm
ON
Alarm
OFF
PV
Alarm
SP
Power
on
Power
off/on
Power
off/on
Alarm
ON
Alarm
OFF
Ack Ack Ack
Ack
Note: The alarm will only cancel when the alarm
condition is no longer current AND then it is
acknowledged
PV
Alarm
SP
Power
on
Power
off/on
Power
off/on
Alarm
ON
Alarm
OFF
Ack 1 Ack 2 Ack 3 Ack 4
Ack 2 - alarm
output remains
in alarm
condition but
ALM indication
goes steady
Ack 3 - alarm output
remains active until the
condition causing the
alarm disappears
Ack 4 - alarm output
remains active until
acknowledged
Alarm
ON
Alarm
OFF
- 3100/3200 1
- 1.3 Dimensions 8
- 1.4 Step 1: Installation 9
- 1.5 Order Code 10
- 2. Step 2: Wiring 11
- 2.5 Wire Sizes 13
- 2.6 Precautions 13
- 2.13 Current Transformer 15
- Local ground 16
- Diagram 17
- ☺ Helpful hints 18
- Pollution Degree 2 19
- 4. Switch On 20
- Subsequent Starts 21
- 4.4 Front Panel Layout 22
- 5. Operator Level 2 24
- ☺ Press 27
- 5.4 Timer Operation 28
- 5.5 Dwell Timer 29
- 5.6 Delayed Timer 29
- 5.7 Soft Start Timer 30
- 5.8 Programmer 30
- 6.1.1 Level 3 33
- 6.1.2 Configuration Level 33
- 6.2 Parameter lists 35
- ☺ Press and hold 35
- 6.3 Navigation Diagram 36
- 6.4 Access Parameters 37
- 7. Controller Block Diagram 39
- Latching 41
- 9. Input/Output 43
- Note 1: 45
- 1. func 46
- 9.1.7 Output List 2 (OP-2) 47
- 9.1.8 Output List 3 (OP-3) 48
- Digital Input B 50
- 10. Setpoint Generator 52
- 11. Control 54
- 11.2.4 Manual Tuning 55
- 11.10 Control Parameters 57
- Deadband OFF 60
- Deadband ON 60
- 12. Alarms 61
- 12.1 Types of Alarm 62
- together 63
- 12.2.1 Example 1 64
- 12.2.2 Example 2 64
- 12.2.3 Example 3 64
- 12.3 Alarm Parameters 65
- 12.4 Diagnostic Alarms 67
- 13. Timer/Programmer 68
- 13.2 Programmer 70
- 13.2.3 Event Outputs 71
- Configure the Timer 74
- 15. Digital Communications 78
- RS232 80
- Address 81
- 15.4 DATA ENCODING 81
- 16. Calibration 92
- 16.2 Offsets 93
- 16.3 Input Calibration 95
- 0mV. Then: 96
- Ω and 400.00Ω 97
- 16.3.6 CT Calibration 100
- 16.4 Calibration Parameters 101
- 17.1.2 Configuration Clip 102
- 17.2 Starting iTools 103
- 17.3 Starting the Wizard 104
- 17.4 To configure the Input 105
- 17.5 To Configure Alarms 106
- 17.6 To Customise Messages 107
- 3100/3200 Series 108
- 17.7 To Promote Parameters 110
- 3100/3200 Series 111
- Press 112
- 17.9 To Set up Recipes 113
- 17.9.2.1 Recipe Definition 114
- 17.9.2.3 Recipe Names 115
- 17.10 Summary 116
- 17.11 Cloning 117
- 19. Parameter Index 120
- 20. Index 122
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