Chapter 3
Theory of Operation
REF 580-1000-02 G
Esprit® Ventilator Service Manual © Respironics, Inc.
3-17
Remote Alarm (Nurse Call)
Esprit remote alarm contacts provide remote alarm capability, allowing the
ventilator to annunciate an active medium or high priority alarm at a location
away from the ventilator. Pressing Alarm silence mutes the remote alarm.
The ventilator signals an alarm condition using normally open (NO) or normally
closed (NC) relay contacts, where the deenergized state indicates an active
alarm. The remote alarm port is a standard ¼-in. phone jack (ring, tip, sleeve)
connector (Figure 3-4).
•
When the ring and sleeve are used, the relay is open during normal
ventilator operation and closed when an alarm is active or the
ventilator is off.
•
When the tip and sleeve are used, the relay is closed during normal
operation and open when an alarm is active or the ventilator is off.
CAUTION:
The remote alarm port is intended to connect only to SELV (safety
extra low voltage and ungrounded system with basic insulation to
ground), in accordance with IEC60601-1. To prevent damage to
the remote alarm, the signal input should not exceed the
maximum rating
of 24 VAC or 36 VDC at 500mA with a current of 1mA.
Figure 3-4: Remote Alarm (Nurse Call) Connector
For ventilators equipped with software revision 4.20 or later, the 15-pin analog
output (chart recorder) port of the ventilator can also be used to connect to the
Respironics Lifecare remote alarm system. The Lifecare remote alarm sounds
under these conditions:
•
A high or medium priority alarm condition is active.
•
Ventilator power is turned off or disconnected.
•
The Respironics Lifecare remote alarm system is disconnected from
the ventilator.
•
The ventilator runs POST.
NOTE:
To connect the Lifecare remote alarm system to an Esprit ventilator, a
DB15 to BNC cable adapter must be installed into the analog output port.
NO
NC
Common
Ring
Tip
Sleeve
Remote alarm
connector and cable
