User's Manual

For assistance, call RITRON at 800-872-1872, or go to www.ritron.com
15
OPTIONAL INSTALLATION INSTRUCTIONS......................................................................................................................................
Connecting an External +12 VDC Power Supply
The Quick Talk
TM
may be used with an external +12 VDC power
supply. With an external supply connected the internal batteries are
automatically configured as a back-up power source. With the Quick
Talk
TM
programmed for External Power and batteries installed as a
back-up, it will broadcast the Power Fail message any time the
external supply is removed and will repeat the Power Fail message
once every hour (default) until external power is restored.
To use the Quick Talk
TM
with an external +I2 VDC power supply:
1. Use the PC Programmer to set the Quick Talk
TM
for External
Power Fail alarm enabled.
2. If the factory recorded “Quick Talk Power Fail” message is not
adequate, record a new Power Fail message.
3. Use Ritron #RPS-203 Power Supply (12-15 VDC, 200 mA), or
equivalent, to power the Quick Talk
TM
. The Quick Talk
TM
requires
11-15 VDC, 200 mA minimum.
4. Connect the positive (+) terminal of the power supply cable to the
RED wire on the Quick Talk
TM
color-coded cable.
5. Connect the negative (-) terminal of the power supply cable to the
BLACK wire on the Quick Talk
TM
color-coded cable.
6. Be sure to use an appropriate sized, sealing wire nut to connect
the wires. The color-coded wires are 24 AWG stranded.
Solar Panels for Operating & Charging Rechargeable Batteries
Quick Talk
TM
uses little power when it is not transmitting. The
estimated time the unit transmits can help determine the solar panel
size required to charge rechargeable batteries. The following formula
can be used to determine the size the solar panel:
The formula to calculate the solar panel’s required mAH:
(TX time per hour) x (TX current in mA) x (Number of hours per
day) = Req’d. mAH per day
Example: Assume the Quick Talk
TM
transmits for one minute of
every hour, on average (1/60 hour). Further assume the Quick Talk
TM
draws 150 mA of current while transmitting.
NOTE: 150 mA is a bit higher than real consumption; the panel will
be slightly oversized.
Plug the Example into the Formula:
(1/60 hour) x (l50mA) x (24 hours/day) = 60 mAH per day
RESULTS: In this Example, the Quick Talk
TM
solar panel requires 60
mAH in a 24-hour period.
NOTE: Study solar panel manufacturers’ information. Quick
Talk
TM
input voltage cannot exceed 15 VDC.
Monitor 4-20 mA Sensor Current Loop with Quick
Talk
TM
Analog Input
Quick Talk
TM
can act as a current sink when a resistor
is connected between an Input’s positive and negative
connection. The resistance value is selected to scale
the current to the permitted 0 - 5 Volt range for the Input
to Quick Talk
TM
. The following formula is used to
calculate the Analog Threshold Setpoints necessary for
your application.
Analog Threshold Setpoint = 4-20 ma current (Amps)
times the resistor value (Ohms)
NOTE: A resistor value of 250Ω provides the
maximum resolution, and is the recommended value.
Using a lower resistance value with the 4-20 mA current
loop produces less than 5 V at the Input and the
measurement resolution is reduced. Using a higher
resistance value at 20 mA can produce a voltage
greater than 5V at the Input, which will not be
recognized.
To configure an Input for 4-20 mA current loop:
1. Connect a resistor between the two wires on the
Quick Talk
TM
color-coded cable that are associated
with the desired Input (see Table 8).
2. Connect the output of the 4-20 mA current loop
device to the positive (+) wire of the Input
connection.
3. Program the desired Input for Analog Input
operation and for the calculated Analog Setpoints.
4. Record an Input OPEN and Input CLOSED
message for the associated Input.