Electrical Trouble Shooting of Automatic Injection Blow Molding Plastic Machinery
|5.5.5 Electrical trouble and trouble-shooting
(1) The semiautomatic or automatic mode can't be reached.
Check if conditions of the semiautomatic and automatic operation is satisfied, conditions are X20=on, X6=on, X15=on and X10=on.
If all the above conditions are satisfied, the semiautomatic and automatic operation can not be run however, then you must check if any approach switch is damaged and the connection with PLC is right. Method: using a metal sheet to induce every approach switch to judge if there is signal entering PLC, if the indicating lamp of PLC is on, then the signal is ok, otherwise, there will be no signal. This proves the approach switch is damaged or the connection is loose.
(2) The semiautomatic and automatic operation can't be finished
When the Automatic Injection Blow Molding Machine runs into a step operation and can't go on into next continually, the reason is in this step, there is no signal in the approach switch to enter PLC, so check the approach switch is inducted or not, if inducted, then check the connection and it is damaged or not.
(3) The semiautomatic and automatic operation is compelled to turn to the manual mode when the Automatic Injection Blow Molding Machine enters some action; this is because the time T1 is preseted too smaller or the short circuit of approach switch. The method is to increase T1 or replace X2.
(4) Skipping a step running in the semiautomatic and automatic operation
If some approach switch is short circuit, the corresponding step will not run and cause skipping a step running, and the solving method is to replace this switch.
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