Campbell CR9000, Instruction Manual

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Section 1. Installation
1-6
All external charging devices must be disconnected from the CR9000 in order
to measure the true voltage level of the internal batteries.
This CR9000 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 CR9000 can be approximated from the
information provided in Table 1.2-2.
TABLE 1.2-2. Current required by CR9000 modules
Model No. Module Quiescent
Current
Current During
Measurement
9031 9041
9011 CPU Module
A/D Module
Power Supply
Module 410 mA 485 mA
9050(E)
9051E Analog Input
Module 0 mA 15 mA
9052DC Filtered Analog
Input Module
5 mA if not
programmed
500 mA + 1.5 (sum of
excitation currents on
channels)
9055 50–Volt Analog
Input Module
0 mA 15 mA
9058E 60 V Isolation
Module 5 mA 360 mA
9060 Excitation Module 108 mA 125 mA
9070 Counter–Timer
Module
0 mA 80 mA
9071E Counter–Timer
Module
25 mA 35 mA
9080 Peripheral Adapter
Module
As an example, the current drain of a CR9000 System containing the base
system (CPU Module, A/D Module, and Power Supply Module: 410 mA / 485
mA) 1 9060 Excitation Module (108 mA / 125 mA, this does not include the
current required for exciting the sensors), 2 9070 Counter/Timer Modules (0
mA / 30 mA), and 4 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 (1
Ahr) would be depleted to a full SAFE discharge level (10.5 V) in about 20
hours. If the CR9000 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
CR9000 batteries. The input is diode protected so the CR9000 batteries will
not leak power to the vehicle if the vehicle's battery is low.