Midmark M9® -05x / M11® -05x Sterilizer Power Up Mode Theory of Operation
To prevent risk of shock always disconnect power before removing covers or performing any service procedure.
Some procedures require power to be connected with covers removed. Line voltage is present. Use extreme caution to prevent electric shock.
The illustration below calls out the components that affect—or are monitored during—all cycle modes. Refer to the dropdowns for detailed descriptions of the Power Up mode.
|
Model |
M9 -050, -053 | M11 -050, -051, -053 |
| Serial Number | All | All |
Primary Fuses
With the sterilizer’s power cord properly connected, facility supply voltage is supplied to the Main PC Board through the two primary fuses. If either fuse is faulty, the sterilizer will have no power.
High-Limit Thermostats
When power is supplied to the Main PC Board, current continuously flows through the two (normally closed) High-Limit Thermostats. This circuit powers all line voltage components.
If either thermostat opens for any reason (overheat or malfunction), the vent valve, fill valve, and heater will lose power. The display, connectivity module, and DC side of the main control board will be active, and the unit will display an error indicating that the High-Limit Thermostats are tripped.
If it is an overheat condition, the sterilizer must cool and requires the power of the unit to be reset to clear the error, or replacement of the thermostat may be required.
Door Switch
Once a cycle is initiated, the Main PC Board continuously monitors the status of the Door Switch.
If an open door is detected, the cycle will not start. If the door switch opens during a cycle, the cycle will be terminated, and the corresponding error code will appear in the display.
