Campbell CR500 Spezifikationen PDF herunterladen (Seite 9)

CAUTIONARY

NOTES

1. To

prevent

corrosion in the CR500,

desiccant

must be

placed

inside

the

enclosure.

To reduce vapor transfer

into the

enclosure,

plug

the cable

entry

seals.

DO

NOT

totally seal enclosures

equipped

with

lead

acid

batteries. Hydrogen

concentration

may

build

up to explosive

levels.

Damage

will occur to the

analog

input

circuitry

if voltages

in

excess

of

+16

V are

applied

for

a sustained

period.

Voltages

in

excess

of 15 V will cause

errors

and

possible

overranging

on other

analog

input

channels.

When

using the CR500

with the

PS12LA,

remember

that the sealed

lead

acid

batteries

can be

permanently

damaged

if

deep

discharged

routinely

or left

in

a

discharged

state

for a

long

period

of time.

The cells

are

rated

at

a 7 Ahr capacity

but

experience

a

slow discharge

even

in

storage.

lt is advisable

to maintain

a

continuous

charge on

the PS12LA

battery

pack,

whether

in operation or

storage.

To

make it easier to

connect

power

to the

CR500

remove

the

green

connector

on the

terminalstrip.

Connect

12 V and

G in the

proper

positions

and

plug

the

connector

back

into its receptacle.

When

connecting

power

to

the

CR500

with

the

green

connector

in

place,lirst

connect

the

positive

lead

from the

power

source to

the

12 V terminal.

Then connect

the

negative

lead to G. Connecting

these leads

in

the

reverse order

makes

it easier

for

the

positive

wire

to accidentally

touch

a

grounded

component

and

short

out the

power

supply.

Voltages

in

excess of

5.5 volts applied

to a

control

poft

can cause the CR500

to

malfunction.

Voltages

in

excess

of

8 VDC

can

cause damage.

Voltages

in

excess of

7 VDC applied

to

the

5

V

port

will

damage

the

CR500.

Voltage

pulses

can be counted

by

CR500

Pulse

Counters configured

for High

Frequency

Pulses. However,

when

the

pulse

is actually a

low frequency

signal

(below

about

10 Hz)AND the

positive

voltage excursion

exceeds 5.6

VDC,

the 5

VDC

supply

will start to

rise, upsetting

all

analog

measurements.

Pulses

whose

positive

voltage

portion

exceed

5.6

VDC with a duration

longer than

100

milliseconds

need external

conditioning.

See

below.

FIGURE.

Conditioning

for Long

Duration

Voltage Pulses

7.

4.

ilt

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 47 48

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