Description
The G478 is a DIN rail mount, frequency input signal conditioner
with 1800VDC isolation between input, output and power. The field
configurable input and output offer flexible, wide ranging capability
for variable frequency drives, magnetic pick-ups, turbine flow
meters, and other pulse or frequency output transducers.
The input of the G478 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 0-5V, 0-10V, 0-1mA, 0-20mA or 4-20mA.
The G478 to be field configured for virtually any frequency input
to DC signal output within the ranges specified. Calibration utilizes
‘Touch-Cal’ technology in which the user simply applies the
minimum and maximum input frequencies, and touches a re-
cessed button to configure the corresponding minimum and
maximum output range.
The Ultra SlimPak housing allows installation of up to 24 units per
linear foot. The wide ranging power supply is inverter isolated and
accepts any voltage between 9 and 30VDC.
Application
The G478 is useful in eliminating ground loops and interfacing
pulse output transducers, such as turbine flow meters and mag-
netic pick-ups, to data acquisition and control systems.
Advanced digital technology, combined with Action’s ASIC technol-
ogy, provide a stable output at low frequencies for higher accuracy.
‘Touch-CALTM Technology
The G478 utilizes ‘Touch-Cal’ technology to greatly simplify
configuration. To set the input frequency range, simply apply the
high input frequency and push the CAL button while the INPUT
LED is lit. The low input frequency is then applied and pushing the
CAL button once again stores the low frequency input. The high
and low ranges are stored in non-volatile memory and correspond
to the high and low output range which is selected via DIP switches.
Frequency Input,
Field Configurable Isolator
Provides an Isolated DC Output
in Proportion to a Frequency Input
ULTRA SLIMPAK®
G478-0001
Field Configurable Input Ranges from 2Hz to 10,000Hz
Eliminates Ground Loops
Field Configurable Output Ranges: 0-5V, 0-10V,
0-1mA, 0-20mA, 4-20mA
Ultra Slim Housing for High Density Installations
G478-0001
150mV to 150V Input Amplitude Level
Touch-CalTM for Simplified Ranging
Flexible Power Supply Accepts 9 to 30 VDC
ASIC Technology for Enhanced Reliability
RoHS Compliant
To precisely adjust the output, the user adjusts the input fre-
quency while the OUTPUT LED is lit until the desired output level
is achieved. The output levels are locked-in by pushing the CAL
button. Status LEDs show the operation mode of the device.
Status LEDs
The G478 utilizes three status LEDs.
The green LED varies intensity as the frequency changes from 0 to
100% of full scale range (e.g., for a configuration of 0-1000Hz, the LED
will be off with an input of 0Hz and fully illuminated at 1000Hz. With
an input of 500Hz, the LED will be dim). If the input signal is 10% more
than full scale range (over-ranged), the LED will flash at 8Hz.
The yellow INPUT LED denotes input programming modes.
The red OUTPUT LED denotes output programming modes (see
Configuration, Calibration and Figure 2 for details).
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 G478 as follows:
Input Range: 0 to 1000Hz
Sensitivity: 1V RMS
Output Range: 4 to 20mA
Note: "Sensitivity" refers to the noise rejection level (the trigger
threshold) of the input.
For other I/O ranges, refer to Table 1 and 2. For calibration mode
reference, see the step-by-step flow chart in Figure 4.
1. With DC power off, choose the desired output voltage/current
range from Table 1 and set position 1 through 8 of SW1.
2. Set the Input sensitivity switch (SW1, 9 & 10) to LO for input
amplitudes between 150mVp and 50Vrms, with noise rejection to
1Vp. Set the switch to HI for input amplitudes between 500mVp
and 150Vrms, with noise rejection up to 10Vp (see Table 2).
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 ouput has increased and is sensing the input. If
the output does not increase, turn the sensitivity potentiometer in
a counter-clockwise direction until the output begins to change
proportionally to the input, plus another full turn.
3. Press the CAL button once to enter the calibration mode. The
yellow and green LEDs will be on.
4. Input the maximum desired frequency and press the CAL
button to store. The yellow LED will now be the only LED on.
5. 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 41 & 42). It is usually easier to choose a value greater than 0Hz
(e.g.,10% of full scale) when calibrating the minimum input and
output (also 10%). When using this method signals below 10% are
still converted linearally.
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 will 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 near 10% of the HI input
frequency. Press the CAL button to store the value. All three LEDs
will be on.
8. Press the CAL button one final time to exit the calibration mode.
The green LED will now be on.
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 and calibration.
Optimal Sensitivity
If the amplitude 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) a turn or two
until the output returns to the previous level.
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 (and 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.
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Table 1: G478 Output Ranges
Table 2: G478 Input Sensitivity Settings
Figure 2: Wiring Diagram for G478
Figure 1: Factory Cal: 0 to 1000Hz, 1Vrms, 4-20mA
Note: All Ultra SlimPak modules are designed to operate in ambient
temperatures from 0 to 55
°
C when mounted on a horizontal DIN rail. If
five or more modules are mounted on a vertical rail, circulating air or
model HS01 Heat Sink is recommended. Refer to HS01 Technical
Bulletin (#721-0549-00) or contact the factory for assistance.
Figure 3: Mounting Multiple Modules Figure 4: G478 Calibration Flowchart
Specifications
Input:
Frequency Input
Full Scale Range: 2 Hz minimum
from 2Hz to 10,000Hz.
Amplitude Range: 150mVp to 150Vrms
Impedance: >10K Ohms
Over-voltage: 180Vrms, max.
Over-range: 20KHz, max.
Common Mode (Input to Gnd):
1800VDC, 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.)
Ordering Information
Models & Accessories
Specify:
1. Model: G478-0001
2. Accessories: (see accessories)
3. Optional Custom Factory Calibration: specify C620 with desired
input and output range
Accessories
SlimPak "G" Series modules will mount on standard TS32 (model MD02) or
TS35 (model MD03) DIN Rail. In addition, the following accessories are available:
HS01 Heat Sink
MD03 TS35 x 7.5 DIN rail
WV905 24VDC Power Supply (0.5 Amp)
H910 24VDC Power Supply (1 Amp)
H915 24VDC Power Supply (2.3 Amp)
MB03 End Bracket for MD03
C664 I/O Descriptive Tags
Accuracy (Including Linearity, Hysteresis):
+0.1% of selected range at 25°C.
Stability:
+0.025%/°C maximum of selected range.
Response Time (10 to 90%):
3 input cycles + 250ms
Common Mode Rejection:
DC: 100dB
>60Hz: 80dB
Isolation:
1800VDC between input, output & power.
EMC Compliance (CE Mark):
Emissions: EN50081-1
Immunity: EN50082-2
Safety: EN50178
LED Indication:
LEVEL (green):
lit when power is on
Input > 110% then 8Hz. flash
Input < -10% then 4Hz flash
INPUT (yellow):
input range programming status
OUTPUT (red):
output range programming status
Dimensions
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
721-0656-00-G 02/09 Copyright© Eurotherm, Inc 2009
Action Instruments Barber-Colman Chessell Continental Eurotherm
actionsupport@eurotherm.com
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:
Consumption: 1.5W typical, 2.5W max.
Range: 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 Conformance per EMC directive 89/336/EEC
and Low Voltage 73/23/EEC
(Input < 75Vp or < 50Vrms, only).
RoHS Compliant
Printed on recycled pape
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