4.6.2 Incubator Heaters and Bed Safety Thermostat
There are two 115 volt incubator heaters rated at 225 watts at 104 volts and mounted at opposite ends of
the incubator heat sink. They are always connected in parallel and are powered by isolated 115 volts from the
heater isolation transformer. This voltage is switched by the incubator SSR.
The resistance of each heater is about 48 ohms and they are in parallel so you should measure about 24 ohms.
Note that the bed safety thermostat is in series with the heaters so if the reading is open circuit you must take
readings at the connectors under the bed to determine which is defective.
To measure the incubator heater resistance on units with revision 9 or lower relay boards, disconnect the black
wire on the incubator SSR and the white wire on the output of the isolation transformer and measure between
these 2 wires.
To measure the incubator heater resistance on units with revision 10 or higher relay boards, disconnect the
black wire on the incubator SSR and the connector from J54 on the relay board. Measure between harness
connector pin 4, and the black wire.
The incubator heater and bed safety thermostat resistance can also be measured by the removing the bottom
cover and measuring directly at the components.
4.6.3 Radiant Heater
The 115 volt radiant heater is rated at 225 watts at 104 volts. It is powered by isolated 115 volts from the
heater isolation transformer switched by the radiant warmer SSR.
The resistance of the radiant heater is about 24 ohms.
To measure the radiant heater resistance on units with revision 9 or lower relay boards disconnect the brown
wire on the warmer SSR and the white wire on the output of the isolation transformer and measure between
these 2 wires.
To measure the radiant heater resistance on units with revision 10 or higher relay boards disconnect the brown
wire on the radiant heater SSR and the connector from J54 on the relay board. Measure between harness
connector pin 3, and the brown wire.
The radiant heater resistance can also be measured by removing the heater housing and measuring on the
radiant heater harness.
4.6.4 Power Supplies
The 5V and 12V supplies are generated on the power supply.
+5STBY is generated on the relay board. These voltages are distributed to the control board, display driver
board, servo oxygen board, and expansion slots through a harness with a series of 4 pin connectors. The
easiest place to measure the power supplies is at one of the spare 4 pin connectors on this power bus.
© 2001 by Datex-Ohmeda, Inc.. All rights reserved.
6600-0343-000 104
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Chapter 4: Troubleshooting
Содержание Giraffe OmniBed
Страница 10: ...x 6600 0343 000 104 2001 by Datex Ohmeda Inc All rights reserved Table of Contents ...
Страница 28: ...xxviii 6600 0343 000 104 2001 by Datex Ohmeda Inc All rights reserved About this Manual ...
Страница 38: ...10 6600 0343 000 104 2001 by Datex Ohmeda Inc All rights reserved Chapter 1 Functional Description ...
Страница 48: ...20 6600 0343 000 104 2001 by Datex Ohmeda Inc All rights reserved Chapter 2 Service Checkout ...
Страница 56: ...28 6600 0343 000 104 2001 by Datex Ohmeda Inc All rights reserved Chapter 3 Calibration and Maintenance ...
Страница 260: ...232 6600 0343 000 104 2001 by Datex Ohmeda Inc All rights reserved Chapter 6 Illustrated Parts ...