Datex-Ohmeda Engstrom Carestation, Technical Reference Manual

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7 Troubleshooting
1505-1018-000 08/07 7-29
On battery Low Internal
Battery – 30
Min Medium
Mains power not available.
Internal battery supply < 30 minutes
calculated via battery discharge
algorithm.
On battery On
Battery Medium
Mains power not available. System
powered by internal battery for more
than 300 ms.
• Normal alarm if system is operating on battery.
• Check connection to AC supply (verify green LED on DU is lit).
• If LED is not lit, check AC mains source, check rear power cord clamp, check fuses.
• If LED is lit, check output of DC power supply at screw terminals. Range is 20-32 V. If out of range, disconnect
DC power supply input harness and verify output is still out of range. Check/replace DC power supply input
harness. If out of range and harness is OK, replace DC power supply.
• Measure voltage at F1 (both sides) on PMB. Range is 20-32V.
• Check/replace fuse F1 on PMB.
• Replace PMB.
Pair sensor out of
range Air Supply Pressure
Sensor Out of Range Low
Out of range Air supply pressure sensor
data.
Range is 195 to 4760 mV
• Check Air supply
• Disconnect sensor and verify output is zero gage pressure.
• Interchange harness connections on both supply pressure sensors.
• If alarm follows the sensor, check sensor connector terminals. Replace supply pressure sensor if necessary.
• If not, check/replace harness.
• If harness OK, replace VMB.
Alarm message Alarm ID Priority Alarm Condition Special Behavior/Comments
• Action/Troubleshooting