Milnor MWR09E5 Series General Operating And Troubleshooting page 47

speed in either direction if the door is closed.
• Never attempt to defeat the safety mechanisms to test cylinder rotation with the door
open.
Formula A and timer stop (Input A)—This input is grounded (changes from – to +) when
pressed, indicating that the keypad button is working and the processor is correctly
interpreting the signal. If the timer stop feature of this machine is used (usually by the
chemical supply system), grounding this input while the machine is running a formula causes
the timer to stop counting until the input is released.
CAUTION 16 : Entanglement hazard—Because the Formula A button (
machine outputs, the motor may start and the cylinder may turn when this button is pressed.
• Ensure that no one is near the motor or drive pulley during testing.
Formula B (Input B)—This input is grounded when
button is working and the processor is correctly interpreting the signal.
Formula C (Input C)—This input is grounded when
button is working and the processor is correctly interpreting the signal.
Formula D (Input D)—This input is grounded when
button is working and the processor is correctly interpreting the signal.
Door Closed and inverter functioning (Input E)—This input is grounded when the processor
sees the that door is securely closed and the inverter is functioning properly. The machine will
not run if this input is not grounded (+).
Terminate button (Input F)—This input is grounded when the Terminate button (
Low level achieved (Input G)—This input is grounded when the pressure switch for low level
(SPLL on the schematic) is closed. This can be simulated by briefly touching a length of wire
between the power and ground terminals (see Figure 11) on the level switch. Do not remove
the wires from these terminals for this test.
High level achieved or vibration safety switch tripped (Input H)—This input is grounded
when the pressure switch for high level (SPHL on the schematic) is closed. This can be
simulated by briefly touching a length of wire between the power and ground terminals (see
Figure 11) on the level switch. Do not remove the wires from these terminals for this test. This
input is also made when the vibration safety switch trips. The vibration safety switch can be
tested by gently holding the pendulum to one side and watching for the input status to change.
Note 11: High level pressure switch SPHL has two wires attached to one of the terminals and one wire
attached to the other terminal. Low level pressure switch SPLL has only one wire attached to each terminal.
Chapter 4. Testing and Troubleshooting
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