Campbell Scientific CR9000X Measurement and Control System - Manual (Page 67)

Section 1. Installation
All external charging devices must be disconnected from the CR9000X in
order to measure the true voltage level of the internal batteries.
This CR9000X current drain depends on the number and type of modules
installed, the sensors excited, and the scan interval and measurements made.
The current drain of a specific CR9000X can be approximated from the
information provided in Table 1.2-2.
TABLE 1.2-2. Current required (at 12 VDC Input) by CR9000X modules
Model No. Module Quiescent
Current
Current During
Measurement
CR9032
CR9041
CR9011 CPU Module
A/D Module
Power Supply Module 410 mA 485 mA
CR9050(E)
CR9051E Analog Input Module 0 mA 15 mA
CR9052DC
DC Filtered Analog
Input Module 5 mA if not
programmed
500 mA + 1.5 (sum of
excitation currents on
channels)
CR9052IEPE Integrated Electronics
Piezo-Electric (IEPE)
Filtered Analog Input
Module
5 mA if not
programmed
6 Channels Programmed
Excite off:
760 mA
Excite 2 mA: 840 mA
Excite 4 mA: 920 mA
Excite 6 mA: 1000 mA
CR9055 50–Volt Analog Input
Module 0 mA 15 mA
CR9058E 60 V Isolation Module 5 mA 360 mA
CR9060 Excitation Module 108 mA 125 mA +1.5 (excitation
currents on channels)
CR9070 Counter–Timer
Module
0 mA 80 mA
CR9071E Counter–Timer
Module
25 mA 35 mA
As an example, the current drain of a CR9000X System containing the base
system (CPU Module, A/D Module, and Power Supply Module: 410 mA / 485
mA) one CR9060 Excitation Module (108 mA / 125 mA, this does not include
the current required for exciting the sensors), two CR9070 Counter/Timer
Modules (0 mA / 30 mA), and four CR9050 Analog Input Modules (0 mA / 60
mA) is about 518 mA between measurement scans and 700 mA during
measurement. If it was active measuring close to 100 percent of the time, fully
charged internal batteries (14 A-hr) would be depleted to a full SAFE
discharge level (10.5 V) in about 20 hours. If the CR9000X system
configuration requires greater than 3 amps, consult a Campbell Scientific
applications engineer for information on the CR9011 Power Supply High-
Current modification.
1.2.2 Connecting to Vehicle Power Supply
A vehicle 12 Volt electrical system can be connected directly to the charge
input on the Power Supply Module. The Power Supply Module will step the
voltage from the vehicle up or down to the proper voltage for charging the
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