GE PANDA Service Manual page 46

Chapter 1: Functional Description
System Functions
1.3.13.4 Start-up
When the unit powers on, there are a number of self-tests that occur; these are the Power On Self Tests
(POST). If a failure is detected during POST, the unit will display a system failure message on the screen,
record the event in the error log, and initiate a high priority alarm. If no failures are detected, normal startup
operation as defined in the user manual will commence.
To visually confirm the servo baby heat algorithm functionality of the warmer unit, perform the following
steps:
Note: One Temperature Simulator (part number 6600-0876-700) is required.
1. Connect the Temperature Simulator (6600-0876-700) to the warmer unit.
2. Power on the warmer unit and admit baby.
3. Use the Temperature Simulator to set Baby Temp to 36.0° C. Press the button to go to Baby Servo Mode.
4. Set the Temperature Set Point to 36.0° C.
5. Disconnect the Temperature Simulator and verify the heater output shows 0% or 0 red bars. Also, an
alarm is generated to confirm probe check connection.
6. Reconnect the Temperature Simulator to the warmer. The heat output should be 50% or 10 red bars.
7. Wait for 60 seconds. There should be no changes to the heat output.
8. Adjust the Temperature Simulator to 36.2° C Baby Temperature and wait for about 30 seconds. You
should see a decrease in the heat output (5% or 1 red bar every 30 seconds).
9. Adjust the Temperature Simulator to 35.8° C Baby Temperature and wait for 30 seconds. You should see
an increase in the heat output (5% or 1 red bar every 30 seconds).
10. Adjust the Temperature Simulator to 35.6° C Baby Temperature and wait for 30 seconds. You should see
an increase in the heat output (15% or 3 red bars every 30 seconds).
Note: In steps 8-10, the heat output will continue to increase/decrease until it reaches 100% or 0% heat
output.
11. Adjust the Temperature Simulator to 36.4° C Baby Temperature. Heat output should decrease to 0% or
0 red bars immediately (no progression).
12. Adjust the Temperature Simulator to 35.4° C Baby Temperature. Heat output should increase to 100%
or 20 red bars immediately (no progression).
1.3.13.5 Safety Relay
The system incorporates a safety relay that interrupts power to the heater if one of the following conditions
occurs:
• Over-temp thermostat opens in the heater head.
• Main application processor detects a fault condition that requires interruption of heater power.
• Smart monitoring processor detects malfunction of main application processor.
• Audio processor detects a fault condition that requires interruption of heater power.
• Heat control processor detects a fault condition that requires interruption of heater power.
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