User guide

Indication Probable Cause(s)
Power
• No power. • Power to unit may be off.
• Fuse may be blown.
• Breaker may be tripped.
• Safety interlock door switch etc. may be activated.
• Wiring may be open.
• Input Power may not be hooked up to pins 8 and 9.
Communications
• Unit will not communicate. • Address parameter may be incorrectly set.
• Baud rate parameter may be incorrectly set.
• Unit-to-unit daisy chain may be disconnected.
• Communications wiring may be reversed, short or open.
• EIA-485 converter box may be incorrectly wired.
• Computer COM port may be incorrectly set up.
• Communications software setup or address may be incorrect.
• Protocol or parity may be wrong, should be 8, n, 1.
• Application software not working properly.
• May need termination and pull-up and pull-down resistors.
Input Error (error number in top display, percent power in bottom)
• Input is in error condition. • The sensor may be improperly wired.
[Err1] Underflow • Sensor wiring may be reversed, shorted or open.
[Err2] Under Sensor Range • Input type setting may be for the wrong sensor / may not be calibrated.
[Err3] Over Sensor Range • Power may be incorrect.
[Err4] Overflow • Ambient temperature may be too hot or too cold.
• The open loop detect shows a broken sensor.
• The calibration offset parameter is set much too high or low.
Alarms
• Alarm won’t occur. • Alarm output may be off.
• Alarm set points may be incorrect.
• Alarm may be silenced.
• Alarm sides may be incorrect.
• Controller may be in diagnostics mode.
• Alarm won’t clear. • Alarm may be latched.
• Alarm set points may be incorrect.
• Alarm hysteresis may be incorrect.
• Input may be in error condition.
Unit Errors (error number in top display, error message in bottom display)
• [Er`4] [rAM] • There is a RAM malfunction.
• [Er`5] [EEcs] • The EEPROM data is corrupted.
• [Er`6] [roM] • There is a PROM malfunction.
• [Er`7] [HArd] • There is a logic hardware problem.
• [Er`8] [PLug] • Module error.
• [Er`9] [cnFg] • Configuration error. Module in invalid position.
• [Er10] [chng] • Module changed.
• [Er11] [SoFt] • New firmware is installed.
• [Er12] [cAL`] • Calibration data is corrupted.
• [Er13] [Atod] • There is an analog-to-digital hardware failure .
• [Er14] [EEhd] • There is an EEPROM hardware problem.
• [Er15] [nEW] • It is the new unit’s first power up.
• [Er16] [Addr] • There is an EEPROM hardware problem.
A.2 ■ Appendix Watlow Series 97
Troubleshooting Alarms and Errors