Frequency Input, Field Configurable Signal Conditioner - AP7380

To precisely adjust the output, the user adjusts the input frequency while the OUTPUT LED is on until the desired output level is achieved. The output levels are locked in by pushing the CAL button. Status LEDs show the operational mode of the device.

Status LEDs

The AP7380 utilizes three status LEDs. The green LEVEL LED changes in intensity with input level. Its intensity varies with the frequency of the input signal during normal operation. If the input signal is 10% more than full scale range, the LED will flash at 8Hz.

Below 0%, the flash rate is 4Hz.

The yellow INPUT LED, when on, denotes input programming modes.

The red OUTPUT LED, when on, denotes output programming modes (see Configuration, Calibration and Figure 1 for details).

Configuration

A major advantage of the AP7380 is its wide ranging capabilities and ease of configuration. The AP7380 enables virtually 99% zero and span adjustability. Any 2Hz range from 0 to 10,000Hz can be converted to a full scale output signal (e.g. 0-2Hz/4-20mA or 9998-10,000Hz/4-20mA).

Unless otherwise specified, the factory presets are as follows:

Input Range: 0 to 1000Hz

Sensitivity: 1V peak (LO)

Output Range: 4 to 20mA

Power: 120VAC

Note: "Sensitivity" refers to the noise rejection level or the trigger

threshold of the input.

For other I/O ranges, refer to Table 1 for output range (SW1) switch settings and to Figure 4 for sensitivity jumper setting (P3).

1. With DC power off, choose the desired output voltage/current range from Table 1 and set position 1 through 6 of the output switch selector (SW1).

2. Set the Input sensitivity jumper (P3) to LO for input amplitudes between 150mVp and 50Vrms, with noise rejection to 1Vp. Set P3 to HI for input amplitudes between 500mVp and 150Vrms, with noise rejection up to 10Vp.

Calibration

1. Connect the input to a calibrated frequency source and apply power. Wait 1 hour for thermal stability before monitoring the voltage or current output.

2. Adjust the input frequency to the desired maximum and observe that the output has increased and is sensing the input. If this is not observed, turn the sensitivity potentiometer in a counter-clockwise direction until the output changes proportionally to the input.

3. With the green LED on press the CAL button once to enter the calibration mode. The yellow and green LEDs should now be on. 4. Input the maximum desired frequency (if not done already) and press the CAL button to store. The yellow LED should now be the only LED on.

5. Input the minimum desired frequency and press the CAL button to store. The green and red LEDs should now be on. Note: The most reliable way to input 0Hz is to short circuit the input pins (5&6).

6. To precisely adjust the maximum output, adjust the input frequency until the output reads within +0.1% of the maximum selected output range. This typically occurs near 90% of the HI input frequency. Press the CAL button to store the value. The red LED should now be on.

7. To precisely adjust the minimum output, lower the input frequency until the output reads within +0.1% of the minimum selected ouput. This typically occurs less than 10% of the HI input frequency. Press the CAL button to store the value. The Yellow, Red and Green LEDs should be on (see Figure 1).

8. Press the CAL button one final time to exit the calibration mode. The green LED should now be on. (With only 5-10% of input, the green LED is off.)

9. Check the minimum and maximum input-to-output calibration. Repeat steps 1 through 8 if calibration is not within desired specifications.

Note 1: To skip Steps 6 and 7 (output adjustment), press CAL button two times after Step 5.

Note 2: Removing power to the unit at any time before Step 8 will restore previous settings

Optimal Sensitivity

If the amplitudes of the input frequency is within the sensitivity parameters (i.e. 150mVp - 1Vp for LO and 0.5Vp - 10Vp for HI), then the sensitivity parameters can be set for optimum noise rejection.

1. Set the input near midrange (50% input) or to a frequency that exhibits the minimum pulse amplitude.

2. Turn the sensitivity pot (SENS) clockwise (CW) until the output drops to minimum

3. Turn the sensitivity pot counter- clockwise(CCW) until the output returns to the previous level. A couple more CCW turns will provide optimal noise rejection.

4. Run the input through the full frequency range to make sure that the pulses are sensed at both the low and high input frequencies. If the output drops out during this test, when the input freq. >0% then turn the sensitivity pot counter -clockwise another turn or two until the output picks up. Repeat to validate sensitivity settings.

Ordering Information

Specify:

1. Model: AP7380-0000

2. Option: U, see text

3. Line Power: 120/240VAC

4. C620: Factory Calibration of input range, setpoints and output relays. (All power supplies are transformer-isolated from the internal circuitry.)

Note: For UL applications above 100V (unrestricted), the signal must be transient limited (e.g. 150V MOV). For CSA applications above 100V (unrestricted), the signal must be isolated from the primary by a 150VA transformer and no fire result from a short circuit at the input.

Accessories:

• M801-0000 Retaining Spring

• M008-A 8 pin Track Mount Socket

• M004-0000 4 ft Long Channel Track

• MD08-0000 8 pin DIN Mount Socket