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Chapter 7
Flow Chart 0-15 E121 Error Code
E121
UNABLE TO CONTROL HOOK WHILE HOMING
This error only occurs while the tyer is in its homing sequence. It indicates either of two similar conditions.
E122 indicates that the controller detected the hook’s home prox turning “ON”, but it cannot drive the hook
past the prox to turn the prox “OFF”. E123 indicates that the controller detected the hook’s home prox
turning “OFF”, but it cannot drive the hook back over the prox to turn the prox “ON”.
SAFETY WARNING:
The following troubleshooting procedure may require that tests be made with the electrical
enclosures open and power turned “ON”. These tests should only be conducted by authorized
personnel who are aware of the electrical and mechanical hazards present.
Clear jam.
The most likely reason for this error is a mechanical obstruction or jam
which is preventing the twister hook from moving as needed. With power
turned “OFF”, turn the twister hook motor thru its complete range of
motion (MTR2) ≥ 360°, check for debris, is a jam present?
With power turned “ON” (do not press “RUN”), rotate twister hook past its prox, verify twister
PH A, PH B and Home LEDs on FTB are turning both “ON” and “OFF”, are they working?
Check Aux board, then
MTR2, then CPU, replace
parts as necessary.
Troubleshoot prox
circuit.
Trouble shoot
encoder circuit.
Yes No
Twister “HOME”
prox not working
Twister PH A
and PH B
not working
LEDs
working
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