Watlow Series 94 User Manual download pdf (Page 24)

5.2 ■ Alarms and Errors Watlow Series 94

Alarms and Errors

Error Code Messages

Three dashes [`---] in the upper display indicate a Series 94 error. The

error code is visible in the lower display.

[`Er2] - Sensor underrange error (applies only to RTD units)

The sensor input generated a value lower than the allowable signal range, or

the A/D circuitry malfunctioned. Enter a valid input. Make sure the [``In]

Input parameter (Setup Menu) and the DIP switch settings both match your

sensor. Refer to Table 4.5b on page 4.5 for the appropriate input type and

range.

[`Er4] - Configuration error

The controller’s microprocessor is faulty; call the factory.

[`Er5] - Non volatile checksum error

The nonvolatile memory checksum discovered a checksum error. Unless a

momentary power interruption occurred while the controller was storing

data, the nonvolatile memory is bad. Call the factory.

[`Er6] - A/D underflow error

The A/D circuit is underrange. An open or reversed polarity sensor is the

most likely cause. Check the sensor; if the connection is good and functions

properly, call the factory. The A/D underrange voltage is too low to convert an

A/D signal. Make sure the [``In] Input parameter matches your sensor and

DIP switches are set accordingly.

[`Er7] - A/D overflow error

The A/D circuit is overrange. An open or reversed polarity sensor is the most

likely cause. Check the sensor; if the connection is good, and the sensor func-

tions properly, call the factory. The A/D overrange voltage is too high to con-

vert an A/D signal. Make sure the [``In] Input parameter (Setup Menu)

matches your sensor and DIP switches are set accordingly.

Error Code Actions

[`Er2], [`Er6], [`Er7]

To clear a corrected error, press the ‰Advance key to clear the input error

code. Wait for the upper display to change from showing [`---] to showing

the process temperature. The Limit message [`Err] will appear. Then

press the RESET key to clear/reset the error latched outputs. There may be

a 30 second delay from when the ‰Advance key is pressed.

[`Er4] and [`Er5] result in these conditions:

• Both outputs will turn off.

• The alarm output, if present, will be in an alarm state (de-energized

with the indicator light on).

• The upper display indicates the process value.

• The lower display indicates the error code.

• All keys are inactive.

• All Setup Menu parameters return to default values.

• The above conditions occur regardless of the value of [`LOC], or the

presence of the Setup or Calibration Menus.

To clear a corrected error cycle power to the controller or press the RESET

key.

CAUTION:

Electrical noise or a

noise event, vibration

or excess environ-

mental moisture or

temperature may

cause Series 94

errors to occur. If the

cause of an error is

not otherwise appar-

ent, check for these.

Figure 5.2 -

Error Code Message.

RESET

LIMIT 94

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 39 40

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Watlow Series 94 User Manual Page 24

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