Troubleshooting E-Stop and Interlock Circuits on the Machine
IM8ECTT-IG Rev B
Troubleshooting E-Stop and Interlock Circuits
On the Machine
Prerequisite setups and materials
|These setups and materials are required before this module is presented:|
|The E-Stop and interlock circuits on Universal‘s products are designed to ensure that axis operation can occur only when these safety circuits are satisfied. The E-Stop and Interlock safety circuit is hard-wired and will perform its function independent of machine software.|
In this lesson, you will look at the E-Stop and Interlock safety circuit in detail. Once you understand how it works you will get some practical experiences in troubleshooting this circuit.
Instructional Strategy for the module
European Safety Standards
European Safety Standard
|Universal‘s E-Stop and Interlock circuit is in compliance with European Safety Standards, which include the following requirements:|
the E-Stop and Interlock Circuits
|This activity is intended to give you some practical experiences in troubleshooting the E-Stop and Interlock Circuits on a machine. In this activity your instructor will put one or more bugs in the machine E-Stop and Interlock circuits. Your job is to find and fix the bugs so that the machine is returned to normal operation.|
*An E-Stop or circuit breaker can often be used to remove assembly power.
Simplified Schematic of the Interlock System for Single Head Axial Machines
Simplified Schematic of the Interlock System for 6241FSimplified Schematic of the Interlock System for Dual Head Axial Machines
Simplified Schematic of the Interlock System for 6380A
|Trace signals in the electrical schematics to answer the following questions.|
This question refers to the drawings for PS1, trace it from the secondary side of 2T (24V SEC) and is tied in with 5FU (sheet 2)
56VDC is supplied to 4TB
Connects 56 VDC from secondary of 1T to 4TB distribution point to X-Y table motors.
the “ELECT DIAG, Power chassis” schematic
Ask students: You lost 24VAC, where it’s generated from? (the inserter’s power chassis, PS1.) Where do you find that drawing? ELEC DIAG, Power Chassis.
E-Stop Circuit Active
Instructor notes: the following table lists suggested bugs to simulate an E-stop and Interlock circuit problem.
|24VAC to PS is lost||Remove 7FU, 4FU, or 5FU|
|21CR can’t be energized||Disconnect X1 and X2|
|Relay problem||Disconnect at contact 21 or 22 of 22CR and 23CR (Interlock system will not enable)|
|Cannot get out of interlock condition||Remove 6PL jumper plug at the back of PS1|
|Cannot get out interlock condition||Remove wire T12 from 21CR relay block|
|No air to cylinders||Disconnect dump valve connector|