Ametek Dycor CG1000-RTP, User Manual

Page: 28 / 96

3-8 | Dycor CG1000-RTP Oxygen Analyzer
Powering standard current outputs from an external voltage
The J8 connector on the back of the CG1000-RTP (Figure 3-5) contains a
set of pins to power the standard current outputs using an external volt-
age source:
VEXT Pin 9
VEXTCOM Pin 10
Jumper
JP2
Define which power source to use.
JP2 is in
(factory
default)
Analyzer uses the internal supply to power the current output
circuits. if you try to use an external voltage at this time, the
system will use whichever voltage is higher
CG1000-RTP voltage is normally about 28 Volts.
JP2 is
removed
External voltage source must be used to power the cur-
rent output circuits. The external voltage source must be no
greater than 30 volts dc.
To determine the minimum external voltage supply required to power the
current outputs, use the following formula:
VEXTmin = .02 amps (RLoad + Rwires) + 4 volts
VEXTmin = minimum external voltage required to power current output
circuit
RLoad = load resistance of the current output device
Rwires = resistance of the wires
Alarm Contact Connections
Connector J8 (Figure 3-5) also contains alarm pinouts.
Watchdog Timer
Default: Deactivated (Closed)
AlARM 1A Pin 5
AlARM 1B Pin 6
A watchdog event triggers these alarm contacts to an open condition. If you have a watchdog
event, and the system returns to normal operations, the watchdog alarm will reset. The system
will retain in memory the last time the watchdog condition occurred.
Service Alarm
Default: Deactivated (Closed)
AlARM 2A Pin 7
AlARM 2B Pin 8
A service alarm event triggers these alarm contacts to an open condition.
Oxygen/Flow Alarm
Connections are configurable in
software to activate under a vari-
ety of user defined conditions,
AlARM 3A Pin 12
AlARM 3B Pin 13
AlARM 4A Pin 14
AlARM 4B Pin 15