Eurotherm
.

Frequency Input Signal Coordinator - Q478

Shop Online

The ActionI/Q model Q478 is a DIN rail mount, frequency input signal conditioner with 1800VDC isolation between input, output and power. The field configurable input and output offers flexible, wide ranging capability for variable frequency drives, magnetic pickups, turbine flowmeters, and other pulse or frequency output transducers.

The input of the Q478 can be configured for any frequency span from 2Hz to 10,000Hz. The input amplitude threshold sensitivity can be adjusted from 150mVp to 10Vp to ensure accurate frequency measurement and minimize transient noise related errors. The maximum input amplitude is 150 Vrms. The output can be set for either 0-5V, 0-10V, 0-1mA, 0-20mA or 4-20mA.

Advanced digital technology allows the Q478 to be field configured for virtually any frequency input to DC signal output within the ranges specified. Calibration utilizes TouchCALTM technology where the user simply applies the minimum and maximum input frequencies, touching a recessed button to configure the corresponding minimum and maximum output range.

Another feature of the Q478 is a 8VDC excitation source common to the input. This can be used as a signal source for relay contacts or as an excitation source for open collector type proximity sensors. The Q478 is DC powered and will accept any power between 9 and 30VDC.

Touchcal Technology

The Q478 utilizes Action Instruments’ TouchCAL technology which greatly simplifies configuration. To set the input frequency range, the user pushes the CAL button to enter the calibration mode. The high input frequency is applied first, while the INPUT LED is lit, and the CAL button is pushed to store the value. The low input frequency is then applied and pushing the CAL button again stores the low frequency input.

The high and low input ranges are stored in non-volatile memory and correspond to the high and low output range which is selected via DIP switches.

To precisely adjust the output, the user adjusts the input frequency while the OUT LED is lit until the desired output level is achieved. The output levels are locked-in by pushing the CAL button. Diagnostic LEDs show the operation mode of the device.

Q478

FEATURES:

  • Protects Equipment and Prevents Ground Loops with 1800V Isolation

  • 150mV to 150V Input Amplitude Level

  • Flexible DC Power Supply Accepts 9 to 30VDC

  • ASIC Technology for High Reliability

  • Five (5) Field Configurable Output Ranges: 0-5V, 0-10V, 0-1mA, 0-20mA, 4-20mA

MORE INFO:

Diagnostic LEDs

The Q478 utilizes three diagnostic LEDs. One is the dual fuction LED signal monitor. This green LED indicates DC power and input signal status. Active DC power is indicated by an illuminated LED. If the input signal is 10% more than full scale range, the LED will flash at 8Hz. Below 0% the flash is 4Hz.

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

Output Switch Settings
Input Sensitivity Settings
Configuration

A major advantage of the Q478 is its wide ranging capabilities and ease of configuration. The Q478 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 the Model Q478 as follows:

Input Range: 0 to 1000Hz
Sensitivity: 1V RMS
Output Range: 4 to 20mA

 

For other I/O ranges, refer to Table 1 for output range (SW2, 1 through 8) switch settings and to Table 2 for sensitivity switch setting (SW2, 9 & 10). For quick and easy calibration mode reference, see the step-bystep flow chart in Figure 1.

 

  1. With power off, snap off the face plate by lifting the right edge, away from the heatsink. Then, slide heatsink forward and off the module. Note, the output switch block (SW2) is located under the heat sink. Choose the desired output voltage/current range from Table 1 and set positions 1-8 of SW2.
  2. Set the input sensitivity switch (SW2, 9 & 10) to LO for input amplitudes between 150mVp and 50Vrms, with noise rejection to 1Vp or, to HI for input amplitudes between 500mVp and 150Vrms, with noise rejection up to 10Vp.
Calibration

For best results, calibration should be performed in the operating installation, allowing at least one hour of thermal stability of the system. If pre-calibration on a test bench is preferred then an output load equal to the input impedance of the device(s) connected to the Q478 output is recommended, along with a 1 hour warm up period.

  1. Install the module on a piece of DIN rail and the I/QRail mounting combination. See the I/ QRail data sheet for details.
  2. Connect the input to a calibrated frequency source and the output to a voltage or current meter. Apply power and allow the system to reach thermal equilibrium (approx 1hour).
  3. Adjust the input frequency to the desired maximum and observe that the ouput has increased and is sensing the input. If this is not observed, turn the sensitivity potentiometer in a counterclockwise direction until the output changes proportionally to the input.
  4. With the green LED on press the CAL button for 5 sec. to enter the calibration mode. The yellow and green LEDs should now be on.
  5. 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.
  6. Input the minimum desired frequency and press the CAL button to store. The green and red LEDs should now be on.
  7. 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 will now be on.
  8. To precisely adjust the minimum output, lower the input frequency until the output reads within +0.1% of the minimum selected output. This typically occurs near 10% of the HI input frequency. Press the CAL button to store the value. The yellow and Red LEDs should be on. The green LED should be dim.
  9. Press the CAL button one final time to exit the calibration mode. The green LED should now be on.
  10. Check the minimum and maximum input-tooutput calibration. Repeat steps 1 through 8 if calibration is not within desired specifications.
TECHNICAL SPECIFICATION (Q478)

Input  Frequency

 

Input    

  • Full Scale Range: 2 Hz to 10,000Hz.

  • Amplitude Range: 150mVp to 150Vrms

  • Impedance: >10KW

  • Overvoltage: 180Vrms, max.

  • Over-range: 20KHz, max.

 

Common Mode (Input to Ground):  

1800V, max.

 

  • Zero Turn-Up: 99% of full scale range (9998Hz)

  • Span Turn-Down: 99% of full scale range (2Hz)

 

Output 

 

Voltage Output    

  • Output: 0-5V, 0-10V

  • Source Impedance: <100W

  • Drive: 10mA, max. (1KW, min. @ 10V)

 

Current Output 

  • Output: 0-1mA, 0-20mA, 4-20mA

  • Source Impedance: >100KW

  • Compliance: 0-1mA; 7.5V, max. (7.5KW, max.) 

    • 0-20mA; 12V, max. (600W, max.)

    • 4-20mA; 12V, max. (600W, max.)

 

Accuracy     

+0.1% of selected range at 25°C, including linearity, hysteresis

 

Stability     

+0.025%/°C maximum of selected range.

 

Excitation Voltage   

8VDC, for open collector and contact closure inputs 5mA short circuit current max.

 

Response Time (10 to 90%)   

500mSec., or 100 times the period of the full scale frequency.

 

CMRR 

DC: 100dB >60Hz: 80dB

 

Isolation     

1800VDC between input, output and power.

 

ESD Susceptibility   

Capable of meeting IEC 801-2 level 3(8KV)

 

LED Indication (green)   

  • LVL (green): lit when power is on;

    • Input < 107% then 8Hz flash

    • Input > -7% then 4Hz flash

  • IN (yellow):   input range programming status

  • OUT (red):   output range programming status

 

Humidity (Non-Condensing)     

  • Operating:   15 to 95% (@ 45°C)

  • Soak:   90% for 24 hours (@ 65°C)

 

Temperature Range     

  • Operating: 0 to 55°C (5 to 131°F)

  • Storage: -25 to 70°C (-13 to 158°F)

 

Power     

2.5W max., 9 to 30VDC

 

Weight   

0.50 lbs

 

Wire Terminations   

Screw terminals for 12-22 AWG

 

Agency Approvals   

  • UL recognized per standard UL508 (File No. E99775).

  • CSA Certified per standard C222 No.0-M91 and 142-M1987 (File No. LR42272-84.)

  • CE Compliance per EMC directive 89/336/EEC and Low Voltage73/23/EEC.

 

Ordering Information
1. Specify: (model number)   Q478-0000
2. Specify optional I/QRail, type and quantity.
3. Optional Custom Factory Calibration; specify C620 with desired input and output range
4. Accessories: (see Accessories)
Accessories
      
All ActionI/Q modules will mount on standard TS32 (model MD02) or TS35 (model MD03) DIN Rail. In addition, the following accessories are available:
  MD02   TS32 DIN rail
  MD03   TS35 x 7.5 DIN rail
  IQRL-D002   2 Position I/QRail & DIN rail
  IQRL-D004   4 Position I/QRail & DIN rail
  IQRL-D008   8 Position I/QRail & DIN rail
  G905   24VDC Power Supply (0.5Amp)
  H910   24VDC Power Supply (1Amp)
  H915   24VDC Power Supply (2.1Amp)

 

Downloads

User Documentation (download requires registration)

Get a Quote

» Indicates required fields

Request for Quote
Your Details
Company Details
*Leave State / Province Code  blank if not applicable*
Contact Details
Product Requirements

Get Support

Visit the Eurotherm Support site