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Installing the MPC Open XP
MPC Open XP
MPC Open XP IO48/816
Carrier Proprietary and Confidential
CARRIER CORPORATION ©2017
Installation and Start-up Guide
All rights reserved
14
Signal Type
Description
0–20 mA
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.
RTD
1
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 counter
2
Pulse counting up to 40 pulses per second.
Minimum pulse width (on or off time) required for each pulse is 12.5 msec.
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
Maximum length
Minimum gauge
Shielding
0–5 Vdc
0–10 Vdc
500 feet
(152 meters)
22 AWG
100 feet Unshielded
100 - 500 feet Shielded
0–20 mA
1000 feet
(305 meters)
22 AWG
100 feet Unshielded
100 - 1000 feet Shielded
Thermistor
Dry contact
Pulse counter
TLO
500 feet
(152 meters)
22 AWG
100 feet Unshielded
100 - 500 feet Shielded
RTD
100 feet
(30 meters)
22 AWG
Shielded
ZS or SPT sensors
500 feet
(152 meters)
18 AWG
22 AWG
Shielded or
unshielded