083730510A DCN8172
Teledyne API T500U CAPS NO
2
Analyzer with NumaView™ Software
23
C
ONVERTING
C
URRENT
L
OOP
A
NALOG
O
UTPUTS TO
S
TANDARD
V
OLTAGE
O
UTPUTS
To convert an output configured for current loop operation to the standard 0 to 5 VDC
output operation:
1. Turn off power to the analyzer.
2. If a recording device is connected to the output being modified, disconnect it.
3. Remove the top cover.
•
Remove the screws fastening the top cover to the unit (one per side).
•
Slide the cover back and lift the cover straight up.
4. Remove the screw holding the current loop option to the motherboard.
5. Disconnect the current loop option PCA from the appropriate connector on
the motherboard (see Figure 2-5).
6. Each connector, J19 and J23, requires two shunts. Place one shunt on the
two left most pins and the second shunt on the two adjacent pins (see
7. Return the top cover to the analyzer and secure.
The analyzer can now have a voltage-sensing recording device attached to that output.
CONNECTING THE STATUS OUTPUTS (DIGITAL OUTPUTS)
The 12-pin STATUS connector allows the digital status outputs to report analyzer
conditions (configured through the Setup>Digital Outputs menu) via optically isolated
NPN transistors that sink up to 50 mA of DC current. These outputs can be used to interface
with devices that accept logic-level digital inputs, such as Programmable Logic Controllers
(PLCs). Each status bit is an open collector output that can withstand up to 40 VDC. All of
the emitters of these transistors are tied together and available at pin D (see Figure 2-6).
ATTENTION
COULD DAMAGE INSTRUMENT AND VOID WARRANTY
Most PLC’s have internal provisions for limiting the current that
the input will draw from an external device. When connecting to a
unit that does not have this feature, an external dropping resistor
must be used to limit the current through the transistor output to
less than 50 mA. At 50 mA, the transistor will drop approximately
1.2V from its collector to emitter.
STATUS
1 2 3 4 5 6 7 8 D
+
+5V to external device
Map the digital outputs 1 thru 8 through the
Setup>Digital Outputs menu.
Figure 2-6. Status Output Connector for Digital Outputs
Summary of Contents for T500U
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