GE Giraffe OmniBed Carestation CS1, Руководство по обслуживанию

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Chapter 1: Functional Description
DataLink
1-6 Service Manual
current sense circuit. It then outputs from the relay board to the solid state relays and the incubator and
radiant warmer heaters.
The humidifier isolation transformer isolates the humidifier heater from the mains voltage. The primaries
mains input comes from the relay board and is switched by safety relay 2. The dual primaries and
secondaries are connected in parallel for 115 volt operation and in series for 230 volt operation. The isolated
secondaries output voltage is equal to the mains input voltage.
The Elevating Base/Canopy Motor (toroidal) transformer is used to reduce the mains voltage down to the
range required for the elevating base and canopy motors. The primaries mains input comes from the relay
board and is switched by safety relay 2. The dual primaries are connected in parallel for 115 volt operation
and in series for 230 volt operation. The output voltage from each secondary is about 15 volts for both 115
and 230 volt operation and is input to the relay board motor control circuits.
The two identical solid state relays (SSR’s) are used to switch the isolated 115 volts to the incubator and
radiant warmer heaters. The SSR’s are mounted to the back panel of the electronics enclosure below the
toroidal transformer. The upper right SSR controls the incubator heater and the lower left controls the
radiant heater.
The 8.4 NiMH PF Battery is connected to the relay board. It is used to power the +5 STBY during power fail.
The battery is re-charged only when the device is powered on.
1.6.1 Rail and Heater Door Switches
There are seven switches used to determine the position of the canopy and the heater doors.
Two normally open switches on each heater door determine the position of the doors. Each switch is wired
in series with the corresponding switch on the other door. One pair of switches closes only when the doors
are fully open and the other pair closes only when the doors are fully closed.
There are 3 normally open switches in the right upright which are used to determine the position of the
canopy. The top switch closes when the canopy reaches the upper position. The middle switch detects
when the canopy is about half way down. The bottom switch closes when the lowest position is reached.
The device will function as a warmer only if the two heater door open switches and the top rail switch are all
closed.
The system will control as an incubator only if the bottom rail switch and the two heater door closed
switches are all closed.
As the canopy lowers the system senses the closure of the middle rail switch, then looks at the heater door
closed switches. If they are not closed, the canopy will stop at that position and the Heater Doors Not Closed
alarm will activate. This insures that the canopy will not lower to the lowest position if the heater doors are
not closed.
1.7 DataLink
The primary functional responsibility of the Datalink (RS-232 Board) is to provide an isolated RS-232
interface for the DataLink serial communication bus and an isolated set of relay contacts for use with a
NurseCall remote alarm system. The signals for both functions are available from a single, 9-pin, D-Sub
connector on the rear panel of the main electronics enclosure.