Watlow Series 935A Manual de usuario descargar pdf (Pagina 39)

Watlow Series 935A User’s Manual 37

To Troubleshoot Sensor

• Remove sensor wires from Terminals 1 and 2.

• For a thermocouple sensor Series 935A, place a jumper wire on Terminals 1 and 2.

Control should display the ambient temperature at the back of the control.

• For an RTD sensor Series 935A, place a 110 +/- 10Ω resistor on Terminals 1 and 2.

The control should read 100Ω = 32°F, 110Ω = 77°F, 120Ω = 127°F.

• An RTD sensor Series 935A can be configured in software as if it were a

thermocouple unit, and then tested as above.

• You can restore factory calibration [`rST], see p. 34-35.

Table 13 - Error Codes and Actions

Display Probable Cause Recommended Action

Reversed thermocouple Change the sensor A-D

connection + to –. leads on Terminals 1 and 2. under flow

Sensor type Go to In prompt, check selection (see p. 20), Sensor

mismatch or open RTD. or check RTD, replace as necessary. under range

Sensor type Go to In prompt, Sensor

mismatch. check selection (see p. 20). over range

Open Thermocouple, bad Check the sensor, A-D

connection, or broken wire. replace as necessary. over flow

Electrical noise. Cycle power to system. See if error clears.

Check system for electrical interference.

Control is inoperable. Check for line voltage at

terminals 7 and 8.

Table 14 - Troubleshoot Control Outputs

When indications such as significant differences between set point and

actual temperatures point to no output action, check output configurations

as described on p. 23. Check wiring, p. 44.

Measure

Output Terminals Load-on State Load-off State

“C” Output 1 3 & 4 LED 1 on LED 1 off

3.0 to 7.0VÎ (dc) 0.0VÎ (dc)

“C” Output 2 5 & 6 LED 2 on LED 2 off

3.0 to 7.0VÎ (dc) 0.0VÎ (dc)

“D” Output 2 5 & 6 LED 2 on LED 2 off

0VÎ (dc) line voltage.

Load sees line voltage Load sees 0VÎ (dc)

“K” Output 2 5 & 6 LED 2 on LED 2 off

<2VÎ (dc) line voltage

Load sees line voltage Load sees 0VÎ (dc)

[`Er1]

[`Er2]

[`Er3]

[`Er4]

[`Er5]

[````]

1 2 ... 34 35 36 37 38 39 40 41 42 43 44 ... 67 68

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