Description
The Q478 is a DC powered 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.
The Q478 can be field configured for virtually any frequency input
to DC signal output within the ranges specified. There is also an
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 TouchCAL Technology to greatly simplify con-
figuration. 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.
Diagnostic LEDS
The Q478 utilizes three diagnostic LEDs. The green (RUN) LED
indicates DC power and input signal status. Active line power is
indicated by an illuminated LED. If the input signal is 7% or more
high, the LED will flash at 8Hz. If the input signal is 7% or more low,
the LED will flash at 4Hz.
The yellow (IN) LED is lit when calibrating the input. The red (OUT)
LED is lit when calibrating the output.
Application
The Q478 field configurable, frequency input signal conditioner is
useful in eliminating ground loops and interfacing pulse output
transducers, such as turbine flow meters and magnetic pickups, to
data acquisition and control systems.
ACTIONI/Q®
Q478
DC Powered Frequency Input
Field Configurable Isolator
Provides an Isolated DC Output
in Proportion to an Input Frequency
Eliminates Ground Loops
Field Configurable Input Ranges 2Hz to 10,000Hz
Field Configurable Output Ranges
150mV to 150V Input Amplitude
Q478-0000
TouchCAL Technology
High Density DIN Rail Mounting
Flexible DC Power Supply Accepts 9 to 30VDC
SnapLocTM Plug-in Terminals
Advanced digital technology, combined with ASIC technology,
provides a stable output at low frequencies for higher accuracy,
and 3-way isolation which completely eliminates ground loops
from any source.
Configuration
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
Note that "Sensitivity" refers to the noise rejection level (the trigger
threshold of the input).
For other I/O ranges, refer to the tables.
WARNING: Do not change switch settings with power applied.
Severe damage will result!
1. With power off, snap off the faceplate by lifting the right edge
away from the heatsink. Then slide the heatsink forward and off
the module. The output switch block (SW2) is located under the
heatsink. 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.
3. Return the heatsink to its original position and attach the
faceplate before beginning calibration.
Calibration
For best results, calibration should be performed in the operating
installation, allowing at least one hour for 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 connected
to the Q478 output is recommended, along with a 1 hour warm up
period.
Note: An I/QRail is required to power the modules. See Ordering
Information.
1. Install the module on a piece of DIN rail and the I/Q Rail
mounting combination. See the I/Q Rail 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 20 minutes).
3. Adjust the input frequency to the desired maximum and
observe that the ouput has increased and is sensing the input. If
the output fails to increase, turn the sensitivity potentiometer in
a counterclockwise direction until the output begins to change
proportionally to the input.
Note: The level LED may not appear to be on if the new range is
less than 10% of the previously calibrated range.
4. With the green LED on press the CAL button for 5 seconds to
enter the calibration mode. The yellow and green LEDs will now
be on.
5. Input the maximum desired frequency and press the CAL button
to store. The yellow LED will now be the only LED on.
6. Input the minimum desired frequency and press the CAL button
to store. The green and red LEDs will now be on.
Note: The most reliable way to input 0Hz is to short circuit the input
pins (C5 & C6).
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 will be on. The green LED should be dim.
9. Press the CAL button once again to exit the calibration mode.
The green LED will now be on.
10. Check the minimum and maximum input-to-output calibra-
tion. Repeat steps 1 to 8 if calibration is not within desired
specifications.
Note 1: To reset the unit while in the calibration mode, push the CAL
button and hold for 5 seconds.
Note 2: Removing power to the unit at anytime before Step 8 will
restore previous settings and calibration.
Optimal Sensitivity
If the amplitudes of the input frequency are 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) a turn or two
until the output returns to the previous level.
4. Run the input through the entire 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, turn the
sensitivity pot counterclockwise another turn or two until the
output picks up. Repeat to validate sensitivity settings.
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Table 1: Output Range Settings Table 2: Input Sensitivity Settings
Figure 1: Q478 Calibration Flow Chart
Specifications
Input:
Frequency
Full Scale Range: 2 Hz to 10,000Hz.
Amplitude Range: 150mVp to 150Vrms
Impedance: >10K ohms
Overvoltage: 180Vrms, max.
Over-range: 20KHz, max.
Common Mode (Input to Gnd): 1800V, max.
Zero Turn-Up: 99% of full scale range (9998Hz)
Span Turn-Down: 99% of full scale range (2Hz)
Output:
Voltage:
Output: 0-5V, 0-10V
Source Impedance: <100 ohms
Drive: 10mA, max. (1K ohms, min. @ 10V)
Current:
Output: 0-1mA, 0-20mA, 4-20mA
Source Impedance: >100K ohms
Compliance:
0-1mA; 7.5V, max. (7.5K ohms, max.)
0-20mA; 12V, max. (600 ohms, max.)
4-20mA; 12V, max. (600 ohms, max.)
Accuracy (Including Hysteresis & Linearity):
+0.1% of selected range at 25°C
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.
Common Mode Rejection:
DC: 100dB
>60Hz: 80dB
Isolation:
1800VDC between input, output and power.
ESD Susceptibility
Capable of meeting IEC 801-2 level 3(8KV)
LED Indication:
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).
CE Compliance per EMC directive 89/336/EEC and Low Voltage 73/23/EEC.
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Dimensions
Ordering Information
Models & Accessories
Specify:
1. Model: 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
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
WV905 24VDC Power Supply (0.5Amp)
H910 24VDC Power Supply (1Amp)
H915 24VDC Power Supply (2.3Amp)
Eurotherm, Inc
741-F Miller Drive
Leesburg, VA 20175-8993
703-443-0000
info@eurotherm.com or www.eurotherm.com/actionio
Factory Assistance
For additional information on calibration, operation and installation
contact our Technical Services Group:
703-669-1318
721-0718-00-G 02/09 Copyright© Eurotherm, Inc 2009
Action Instruments Barber-Colman Chessell Continental Eurotherm
actionsupport@eurotherm.com
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