Alarm SAF RMBE Series Manual de Instruções descarregar pdf (Página 8)

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Functions (cont’d)

PRESET DEVIATION ALARMS

The RMB provides two deviation alarms, preset to 30 °F or 17 °C above and

below setpoint value. If the process temperature falls below the setpoint

minus the low deviation alarm value, or if the process temperature rises

above the setpoint plus the high deviation alarm value, the controller enters

the alarm state. The Alarm LED will illuminate. A port line is enabled on the

communications connector strip that can be used to activate the audible

alarm on Athena’s ACM or ASM communications module (or similar

module like the mainframe endplate module) if one is included in the sys-

tem. When a deviation alarm condition occurs, this port is activated.

CURRENT MONITOR / OUTPUT FAILURE DETECTION

The Current Monitor processor continually monitors heater current readings

to ensure that they correlate with output activity.

If the output device signal (HEAT) is off and a current flow is detected, then

the processor will post a triac short error, the lower display will toggle

between “Out” and “SHrt,” and the Alarm LED will illuminate. All other

indicators will be off, and all control processing will terminate.

If the output device is on but no current flow is detected, then the processor

will post a bad heater error, the lower display will toggle between “bAd” and

“Htr,” and the Alarm LED will illuminate. All other indicators will be off, and all

control processing will terminate.

If either of these error conditions is detected, and the Power Interrupt option

is installed, a relay will open to shut off power between the triac and heater.

There is no automatic recovery from either of these error conditions. Once

detected and posted, power to the unit must be reset for control processing

to resume.

SENSOR ERROR DETECTION

When a sensor error is detected, the upper display will alternately flash

between “TC” and the cause of the thermocouple error. “rEv” occurs if the

thermocouple is reversed, and “oPn” occurs if the thermocouple is open. The

alarm LED will illuminate, and the output will be disabled. When “rEv” or

“oPn” occur, the unit goes into Manual Mode 0%.

NORMAL OPERATING MODE DISPLAY FUNCTIONS

In the absence of any special circumstances or error conditions, the upper

display (3-character display) of the RMB is dedicated to the presentation of

the Process Value when the unit is in Normal Operating MODE. The

Process Value is displayed in accordance with the temperature scale

established by the “Units” jumper.

In the absence of any error conditions, the lower display (4 character

display) of the RMB is used to present a variety of items. The operator can

index through the available items with brief presses of the DISPLAY key.

AUTOTUNE ACTIVE INDICATION

Whenever the Autotune Process is active, the upper display will alternately

flash between Autotune (tUn) and Process Value.

The Autotune process will terminate when completed, or when an error has

been detected. When autotuning is completed, the flashing Autotune Active

display (tUn) will revert to a steady display of the process value. When the

process self-terminates due to an error condition, the Autotune Active

display will flash alternately with an error code, indicating the specific error

condition that has occurred. (see page 16).

The Autotune process can also be terminated by pressing the Mode key

while the Autotune process is active. The unit will revert to auto control

mode, and the flashing Autotune Active display will be replaced with a

steady readout of the process value.

Functions (cont’d)

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Alarm SAF RMBE Series Manual de Instruções Página 8

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