Section 2
General Description
Circuit Breakers
The electrical system includes three magnetic circuit breakers to protect
machine functions (primary AC power input, convenience receptacles,
and backup battery power). The circuit breakers are located on the rear
of the monitoring bank.
When the plunger is flush with the surface of its base, the circuit
breaker is in its normal, closed position. A circuit breaker is open
(tripped) when its plunger extends beyond its base. If a breaker is
tripped, the cause must be found and corrected before using the
anesthesia system.
Backup Battery
System
The backup battery system consists of a rechargeable battery and a
built-in battery charging system.
Although most hospitals have emergency generators that provide
AC power when line power fails, a delay may occur before generator
power comes on line. The backup battery system automatically provides
power during the period between line power failure and activation of the
hospital’s emergency generator. The backup battery also provides power
if the anesthesia machine’s power cord is accidentally unplugged during
a case.
When the hospital’s emergency generator comes on-line (or when a
disconnected power cord is reconnected), the Narkomed 2B automatically
switches back to AC power and recharges its battery. The battery
charging system charges the battery any time the power cord is
connected to an active AC power source. The charger can recharge a
fully discharged battery in approximately 16 hours.
Machine
Functions on
Backup Battery
Power
If the hospital’s primary AC power fails, the backup battery system is
activated. All monitoring functions will continue for approximately 30
minutes if the battery is fully charged.
The following events signal activation of the backup battery system:
• The yellow AC POWER FAIL indicator on the anesthesia
machine’s alarm panel comes on.
• The Advisory message AC PWR FAIL appears on the central
alarm display.
• A single tone sounds when AC power is first disrupted.
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