Siemens SC 7000 Service Manual page 34

Service Manual
6.1.7 Power Mode Indication
6.1.8 Piezo Alarm
6.1.9 Fault Protection
6.1.10 External Pod and Cartridge
Overload Protection
18
Table 2-1 Power and Charger LED Indicators (Continued)
LED
Charger Docking station power on
Docking station power off
*Battery or power fault
* The charger LED is off if the main battery temperature is
excessive or if there is a power fault.
The source of power is indicated to the processor via the power mode bits,
as given in Table 2-2.
Table 2-2 Power Mode Table
MODE1 MODE0
1 X
0 0
0 1
The piezo alarm activates at power up, power down, and if a software
watchdog is activated. At turn on, the software shuts the piezo off after two
seconds. The piezo functions are as indicated in Table 2-3.
Table 2-3 Piezo Alarm
Cause
Turn on
Turn off
Processor watchdog
+5V Undervoltage
+3.3V Undervoltage
Reverse polarity protection for the batteries and the PSL input are provided
by shunt diodes and fuses on the connector board. There is also a fuse in
series with the internal battery harness. +5V, +3.3V, and +12V supplies are
provided with overvoltage protection.
The main battery has a temperature sensor that is used to disable charge
or discharge of the battery if the temperature is excessive. The auxiliary
battery has a thermostat (65 ±5°C) built in to prevent operation or charging
if an overtemperature condition exists.
A temperature sensor in the power supply section of the main board will
shutdown the power system if the board temperature is excessive.
All power converters are fused to limit fault currents.
The external pods and cartridge current limit circuits are implemented in the
following manner:
When an overload occurs, the load is switched off after the 0.2 second
overload timeout. A retry occurs after 5 seconds.
Siemens Medical Systems, EM-PCS, Danvers
NOT A CONTROLLED DOCUMENT
SC 7000 and SC 9000XL Patient Monitors
CONDITION LED STATE
on
off
off
INDICATION
operating on dock power
operating on auxiliary battery
operating on main battery
Duration
2 seconds
>4 seconds, <10 seconds
Continous (until sucessful reboot)
>4 seconds, <10 seconds
>4 seconds, < 10 seconds
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