1. Engineer Training XL1200 Electric

2. Engineer Training XL1200 Electric Confidential 2 Block Diagram

3. Engineer Training XL1200 Electric Confidential 3 Open Cabin

4. Engineer Training XL1200 Electric Confidential 4 Upper P.D.U We have the following parts: 1.Temperature Display/Control for the Heating Table. 2.Heating Hood Row Selection/OFF Switch 3.Heating Hood Zone Selection Switch. 1 2 3

5. Engineer Training XL1200 Electric Confidential 5 Mid Level P.D.U Heating Hood 3 Phase Magnetic Relay. Here is where the computer Turns on the Heating. Power Pilot Lamps. (Right) Fuses for the Pilot Lamps (Left). Main Power Breaker Main Power Switch

6. Engineer Training XL1200 Electric Confidential 6 Lower Level P.D.U Main Power Filter Surge/Spike Suppressor Circuit Safety System Relay Heating Table Relay UPS/Main Selector Switch

7. Engineer Training XL1200 Electric Confidential 7 New PDU (UL Certified) New Safety Relay New Safety relay K3 (the same relay type used for activating the Drying System) for the drivers replaces the old problematic one. The K3 relay has been moved to a new position, and the RL3 relay is installed into its place (see Figure 4). K3K3 RL 3

8. Engineer Training XL1200 Electric Confidential 8 New PDU (UL Certified)

9. Engineer Training XL1200 Electric Confidential 9 New PDU (UL Certified) New Main 3-phase Circuit Breaker  The main Circuit Breaker F1 (see green line) includes the Switch Tripped mechanism (terminals 9,10). The two phases are connected (see dashed green line) via the Emergency Switch.  When the Switch Tripped is powered, the F1 contacts are closed and the machine is connected to the power line.  When the Emergency Switch is pressed, the Switch Tripped is powered off and the F1 contacts are opened; i.e. the machine is disconnected from the power line.

10. Engineer Training XL1200 Electric Confidential 10 New PDU (UL Certified) New Emergency Stop Button The new PDU is equipped with its own Emergency Stop button When pressed, the RL3 relay is activated and the electrical power is disconnected before the Main 3-phase Circuit Breaker and from the UPS to the machine – see Figure (next slide).

11. Engineer Training XL1200 Electric Confidential 11 Main Safety - PDU To UPS

12. Engineer Training XL1200 Electric Confidential 12 Main Safety - PDU The green dash line marks the circuit UPS  Emergency Switch  RL3 coil  UPS. When the Emergency Switch is pressed, this circuit is opened. The cyan dot line specifies the circuit UPS  RL3 contacts  Drivers  Left Cabinet (PC, Power Supplies)  UPS. When the Emergency Switch is pressed, this circuit is opened. The magenta dot line specifies the self-sustain loop for holding the RL3 powered in case of general electric failure (i.e. Switch Tripped is not powered and the green circuit is opened).

13. Engineer Training XL1200 Electric Confidential 13 New PDU with Heating Control Unit (External or Built-in)