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Q476-0000
ACTIONI/Q
®
Q476
AC Powered Frequency Input
Field Configurable Isolator
Provides an Isolated DC Output
in Proportion to Input Frequency
Eliminates Ground Loops
Field Configurable Input Ranges 2Hz to 10,000Hz
Field Configurable Output Ranges
150mV to 150V Input Amplitude
Description
The Q476 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 Q476 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.
he Q476 can be field configured for virtually any frequency input
T
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 Q476 is AC powered
and will accept any power between 85 and 265VAC.
TouchCAL Technology
The Q476 utilizes TouchCAL Technology to greatly simplify configuration. The high and low input ranges are stored in nonvolatile memory and correspond to the high and low output range
which is selected via DIP switches.
Diagnostic LEDS
The Q476 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 Q476 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.
TouchCAL Technology
DIN Rail Mounting with IQRL
Universal AC Power 85 to 265 VAC
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 Q476 as
follows:
Input Range:
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 below.
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.
0 to 1000Hz
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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 Q476 output is recommended, along with a 20 minute 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.
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 calibration. Repeat steps 1 to 8 if calibration is not within desired
specifications.
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.
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.
Table 1: Output Range Settings
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Table 2: Input Sensitivity Settings
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Figure 1: Q476 Calibration Flow Chart
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Specifications
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Input:
Frequency
Full Scale Range: 2Hz 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 Linearity & Hysteresis):
+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 (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., 100 to 240VAC +10%, 50 to 400Hz
Weight:
0.50 lbs
Wire Terminations:
Screw terminals for 12-22 AWG
Agency Approvals:
CSA certified per standard C22.2 (File No LR 42272).
UL recognized per standard UL508 (File No E99775).
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Dimensions
Ordering Information
Models & Accessories
Specify:
1. Model: Q476-0000
2. Specify I/QRail type and quantity (required)
3. Accessories: (see Accessories)
4. Optional Custom Factory Calibration; specify C620 with desired
input and output range
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-2002 2 Position I/QRail &DIN rail
IQRL-2004 4 Position I/QRail &DIN rail
IQRL-2008 8 Position I/QRail &DIN rail
Printed on recycled pape
Action Instruments
Chessell
Eurotherm
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