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| Configuration |
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| Function Prompt | Selection or Range of Setting |
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| Parameter | ||||
| Lower Display |
| Upper Display |
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| Definition | |||
| English | Numeric |
| English | Numeric |
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| Code |
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| Code |
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| DE 2 |
| 16 |
| DEVIATION FROM LSP 2 (NOTE 3) | ||
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| TC W |
| 17 |
| THERMOCOUPLE WARNING (NOTE 5) | ||
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| TC F |
| 18 |
| THERMOCOUPLE FAILING (NOTE 6) | ||
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| ATTENTION | ||
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| NOTE 1. When the controller is configured | ||
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| for Three Position Step Control, alarms set | ||
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| for Output will not function. | ||
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| NOTE 2. Alarm 1 is not available if the Timer | ||
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| is enabled because Alarm 1 is dedicated to | ||
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| Timer output. | ||
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| NOTE 3. This Deviation Alarm is based upon | ||
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| deviation from the 2nd Local Setpoint or | ||
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| Remote SP regardless of whichever SP is | ||
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| active. | ||
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| NOTE 4. Loop Break monitors the control | ||
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| loop to determine if it is working. When | ||
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| enabled, the control output is checked | ||
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| against the minimum and maximum output | ||
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| limit settings. When the output reaches one | ||
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| of these limits, a timer begins. If the timer | ||
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| expires and the output has not caused the | ||
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| PV to move by a | ||
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| then the alarm activates, thus signalling that | ||
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| the loop is broken. The loop break timer | ||
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| value must be configured by the operator as | ||
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| the AxSx VAL entry. This value is in | ||
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| seconds with a range of 0 to 3600 seconds. | ||
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| A setting of 0 is equivalent to an | ||
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| instantaneous loop break when the output | ||
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| reaches one of its limit values. | ||
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| The amount of PV Movement required is | ||
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| determined by the “UNITS” setting in the | ||
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| Display Setup Group. For the Degrees F | ||
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| configuration, the PV must move by 3° in the | ||
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| desired direction in the time allowed. For the | ||
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| Degrees C configuration, the PV must move | ||
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| by 2° in the desired direction in the time | ||
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| allowed. For the “NONE” selection, the PV | ||
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| must move 1% of the PV range in the time | ||
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| allowed. | ||
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| Loop Break alarms do not have a | ||
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| HIGH/LOW State configuration, they are | ||
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| always assumed to be a HIGH state alarm. | ||
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4/07 | UDC2500 Universal Digital Controller Product Manual | 77 |
