Interlock Requirements and Troubleshooting

Safety Interlocks are important components every Enercon surface treating system has. The station requires that all standard interlocks, as well as any optional or customer supplied interlocks, be satisfied prior to operation. These precautions ensure the safe operation of your surface treating system.

The standard interlocks provided with Enercon surface treaters are the Zero Speed Interlock, the Electrode Position Interlock and the Exhaust Air Flow Interlock. Other optional interlocks may include the Differential Pressure Interlock for purged systems, access Door Interlocks, Trip Cable Interlocks and E-Stop Interlocks. Each of these interlocks are connected in series. If just one of the interlocks is open, the power supply will not be allowed to enter the RUN mode when the start command is received.

If any of these interlocks remain open when all interlock requirements appear to have been met, it will be necessary to troubleshoot the interlocks either as a group or individually. Detailed requirements for checking any specific interlock can be obtained by contacting Enercon’s customer service department. A few standard interlock troubleshooting tips are described below.

Standard Interlock Troubleshooting Tips
Electrode Position E-Stop Zero Speed Exhaust Air Flow
       
This interlock closes, shown left, when the electrode assembly it is monitoring is in the treat position. If the contact is open when the electrode assembly is in the proper position the possible causes can include, but are not limited to: incorrect positioning of the "V" notch and roller on the collar, incorrect adjustment of the interlock switch, failed or damaged switch or damaged interconnect wiring from the switch to the power supply. The E-Stop interlock is closed when the switch is in the out position and opens when the switch is pressed in. If the contact is open when the switch is out the possible causes can include, but are not limited to: failed or damaged switch or damaged interconnection wiring from the switch to the power supply. This interlock closes when the ground roll of your system is turning at or above the minimum speed requirement of your system. If the contact is open when the roll is turning at the proper speed the possible causes can include, but are not limited to: incorrect speed set point, incorrect alignment of the speed sensor, failed or damaged speed sensor or damaged interconnect wiring from the speed sensor to the power supply. This interlock closes when the exhaust airflow of your system is at or above the minimum CFM requirement for your system. If the contact is open when the blower is on the possible causes can include, but are not limited to: incorrect set point of the air flow sensor, incorrect alignment of the airflow sensor, failed or damaged airflow sensor or damaged interconnect wiring from the speed sensor to the power supply.