Power Supply - GPI SC510 Guía De Operación

OUTPUT
The GPI Scaled-Pulse circuit has a single output. It is a
true open-collector type, referenced to any of the COM
terminals. This output is rated for a maximum sink cur-
rent of 200 mA, and a maximum open circuit voltage of
60 V. Be sure that you never exceed these limits.
NOTE: Do not apply any AC voltage to this output, as
the internal device may be damaged.
The output produces a single fixed-duration pulse (pulls
"low" briefly) once per "n" input pulses, where "n" is the
number set by the K-factor switches (see operational
description). A relay is not supplied; however, the user
may drive a relay by connecting the coil from the positive
DC voltage supply to the open collector output. If so,
a DC coil relay should be chosen, with its coil voltage
equal to the supply voltage and resistance chosen to
limit current to less than 200 mA.
The duration of the output pulse is fixed at 25 millisec-
onds. This duration is long enough to operate a typi-
cal relay or mechanical counter. However, a very low
K-factor may result in an output that appears to be "ON"
all the time. Shorter (or longer) output pulse durations
can be supplied, and may be available on special order
from the factory.

POWER SUPPLY

The GPI Scaled Pulse circuit is designed to operate
correctly when supplied with any DC voltage between
about 5-30 volts, referenced to any of the COM termi-
nals. The supply voltage need not be regulated, as long
as it falls within these limits. Reverse polarity protection
is included.
Normal operating current is about 10-15 mA, and will
never exceed 25 mA.
WARNING
Do not apply AC voltage to the unit. Low voltage
AC will not damage the unit, but may cause erratic
operation.
ENVIRONMENTAL
All electronic components in the GPI Scaled Pulse circuit
are rated for an operating temperature range of -40° F
to +185° F (-40° C to +85° C).
The circuit will operate correctly in humidity conditions up
to about 95% non-condensing. As with most electronic
circuits, exposed circuitry should not be subjected to
liquid moisture.
No components of the Scaled Pulse circuit are especially
sensitive to shock or vibration. Ordinary back-of-truck
vibration will not damage the unit.
OPERATION
When installing the GPI Scaled Pulse Module, make
sure that all electrical connections are tight and secure.
The only user-adjustable settings are to the K-factor
switches. On a typical flowmeter, the K-factor is usually
available, either stamped on the unit itself or printed in
the accompanying documentation (if you cannot find it,
please contact the meter's manufacturer). Using a small
straight blade screwdriver or similar tool, simply set the
module's K-factor switches to this number.
K - F A C T O R S W I T C H E S
X X
The "X" markers represent the digits of the K-factor.
This allows a K-factor range of 0000.1 to 9999.9. The
switches are arranged and labeled as follows:
X X
Each switch may be set to any of 10 positions (0-9). Set
each so that the whole string of switches represents the
meter's K-factor. The switches do not have any mechani-
cal stops and may be turned all the way around.
If the meter's K-factor does not contain a decimal point,
set the right-most switch to "0".
Example: Meter K-factor is 3555 PPG
3 5
If the meter's K-factor has more than one decimal posi-
tion, you must round the number so that you can set the
switches with only one decimal position.
Example: Meter K-factor is 5252.38 PPG
5 2
X X X
X X X
5 5 0
5 2 4
5