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Installing the MPC Open XP
Signal Type
0–20 mA
RTD
1
Pulse counter
2
1
To use a thermistor or RTD not listed above, you can set up a custom translation table for your sensor.
2
The MPC Open XP can perform pulse counting for dry contact or voltage inputs if you assign the input to a Pulse
to Analog Input microblock.
NOTE If you have one or more RTD's connected to the inputs, the total current draw of all Thermistor, RTD, and
Dry contact devices wired to the inputs should not exceed 10 mA. Exceeding this limit affects the accuracy of the
RTD's. Use the following approximations as a reference:
•
10 kOhm Thermistor draws approximately 0.334 mA.
•
1 kOhm RTD draws approximately 0.834 mA.
•
Dry contact draws approximately 1 mA.
For example, if using an expander with 12 RTD's connected to the inputs, the remaining 4 inputs cannot be used.
This assumes negligible wiring impedance (<10 Ohms) for each RTD input, with up to 100 feet of 22 AWG cable.
Input wiring specifications
Input
0–5 Vdc
0–10 Vdc
0–20 mA
Thermistor
Dry contact
Pulse counter
TLO
RTD
ZS or SPT sensors
MPC Open XP
MPC Open XP IO48/816
Installation and Start-up Guide
Description
The input resistance on the positive (+) terminal is 250 Ohms. The Aux Power Out
connector is capable of supplying 24 Vdc to multiple 4–20 mA transducers, but the total
current demanded must not exceed 200 mA. If the voltage measured from the Aux Power
Out connector to Gnd is less than 18 Vdc, you need to use an external power supply.
Platinum - 1 kOhm at 32°F (0°C)
Nickel/Iron - 1 kOhm at 70°F (21°C)
Balco TS8000 - 1 kOhm at 70°F (21°C)
Input voltages should be from 0.6–1.2 V
NOTE For improved accuracy, Carrier recommends using an external current transducer-
type RTD, when RTD's are required with the MPC Open XP. Be aware that milliamp-type
sensors require different jumper settings and different wiring arrangements.
Pulse counting up to 40 pulses per second.
Minimum pulse width (on or off time) required for each pulse is 12.5 msec.
Maximum length
500 feet
(152 meters)
1000 feet
(305 meters)
500 feet
(152 meters)
100 feet
(30 meters)
500 feet
(152 meters)
Carrier Proprietary and Confidential
Minimum gauge
22 AWG
22 AWG
22 AWG
22 AWG
18 AWG
22 AWG
14
Shielding
100 feet Unshielded
100 - 500 feet Shielded
100 feet Unshielded
100 - 1000 feet Shielded
100 feet Unshielded
100 - 500 feet Shielded
Shielded
Shielded or
unshielded
CARRIER CORPORATION ©2017
All rights reserved
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