Ritron Quick Talk Manuel du propriétaire télécharger pdf (Page 18)

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For assistance, call RITRON at 800-872-1872, or go to www.ritron.com

FIG8. CURRENT LOOP

(EXAMPLE CONNECTION DIAGRAM)

5. MONITORING 4 - 20 mA

SENSOR CURRENT LOOPS

W/ ANALOG MODES

TO USE QUICK TALK TO MONITOR 4-20 mA

SENSOR CURRENT LOOPS WITH ANALOG INPUT

MODES

Quick Talk can act as a current sink after a resistor is

connected between the Switch 1 positive and negative

terminals. The resistance value is selected to scale the

current to the permitted 0 - 5 Voltage range for the Switch 1

input to Quick Talk. See the following formula, and Fig8.

5 Volts (max. permitted Voltage)

--------------------------------------------------------- =

250 Ohms

20 mA (max. current from sensor loop)

of resistance

NOTES:

Using a lower resistance value with the 4-20 mA

current loop produces less than 5 V at the Switch

1 input; since the full 5 Volt range is not used,

measurement resolution is reduced.

Using a higher resistance value at 20 mA

produces greater than 5V at the Switch 1 input,

which risks damaging the Quick Talk unit.

6. SOLAR PANELS FOR

OPERATING & CHARGING

NI-CD BATTERIES

TO USE SOLAR POWER PANELS FOR OPERATION

AND FOR CHARGING INTERNAL NI-CD BATTERIES:

Follow the instructions on page 8 for using Ni-Cd batteries,

including Step c. to enable the Battery Saver, and d. to

minimize the charging current needed. DO NOT EXCEED

15 Volts at the external battery terminals.

CALCULATING THE SOLAR PANEL SIZE:

Quick Talk uses little power when it is not transmitting. The

estimated time the unit does transmit can accurately

determine solar panel size requirements to charge Ni-Cd

batteries. The following formula sizes the panel properly:

EXAMPLE: Assume the Quick Talk transmits for one

minute of every hour, on average (1/60 hour).

Further assume the Quick Talk draws 150 mA

of current while transmitting (150 mA).

NOTE: 150 mA is a bit higher than real consumption; the

panel will be slightly oversized.

The formula to calculate required mA hours:

(1/60 hr.) x (150 mA) x

(

No. of hours

)

= Req'd. mA hr./

day

operation/ day

Plug the Example into the Formula:

(1/60 hour) (150mA) (24 hours/ day) = 60 mA hours/ day

RESULTS: In this Example, the Quick Talk solar panel

supplies 60 mA-hours in a 24-hour period.

NOTE:Study solar panel manufacturers' information.

TO USE LATCHING MODE:

Use the Quick Talk latching mode application if repeated

transmissions are desired with a momentary switch (i.e.:

a push-button). The latching effect maintains message

repeats after the momentary switch change has ended.

EXAMPLE: To use a Quick Talk in a paint department, set it

to repeat phrase transmissions after the "Press

for Help" push-button is activated. In this

example, the recorded phrase transmits every 2

minutes until the Quick Talk latch mode resets

(an employee resets Switch 2).

TO PROGRAM LATCHING MODE:

NOTE: This example uses a Normally Open switch.

a. Pick up the telephone receiver and listen for the

acknowledge tone.

NOTE: To remove possible interference from prior

programming, in this application it is best to

use a Quick Talk unit set to factory defaults.

To restore factory defaults:

Dial "978" for VHF units; dial "979" for UHF units.

To program a different frequency than the default,

refer to page 7.

b. If you have a Normally Open switch, dial "814" to latch

the CLOSED condition on Switch 1. A beep indicates

the command is accepted.

7. USING LATCHING OPTION

c. Dial "312". Quick Talk sounds three short tones to

prompt you to begin speaking, then record the Switch 1

phrase, to be no longer than eight seconds.

EXAMPLE: Record "Help needed Paint Department."

d. Dial "5110" to suppress the Switch 1 OPEN message

(preventing transmitted messages when the sales

person resets the unit).

NOTE:

Skip Step d. if it is desirable to send a

message when the unit is reset.

e. Dial "5124" to select 2 minutes as the message repeat

schedule for Switch 1 latched condition; refer to Table 9.

f. Dial "999", wait for the beep, then hang up the telephone

to complete the programming.

DEF AULT

TABLE 9

TIME BETWEEN

MESSAGES CODE NUMBER

None/ Never .................................. 0

On Changes Only ......................... 1

30 seconds .................................... 2

1 minute ........................................ 3

2 minutes ....................................... 4

5 minutes ....................................... 5

10 minutes ..................................... 6

30 minutes ..................................... 7

1 hour ............................................ 8

2 hours .......................................... 9

UICK

ALK

DV ANCED

EATURES

SWITCH 1 SWITCH 2EXT. PWR.

4-20mA Current Loop Input

250 Ω

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 27 28

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Ritron Quick Talk Manuel du propriétaire Page 18

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