DESCRIPTION
The
Model DRG-SC-FR is a DIN rail
mount, frequency input signal condi-
tioner with 1800VDC isolation be-
tween input, output and power. The
field configurable input and output
offer flexible, wide ranging capability
for variable frequency drives, mag-
netic pick-ups, turbine flow meters,
and other pulse or frequency output
transducers.
The input of the DRG-SC-FR can be
configured for any frequency span
from 2Hz to 10,000Hz. Pulse thresh-
old sensitivity can be adjusted from
50mVp to 150Vrms to ensure accu-
rate frequency measurement and
minimize transient noise related er-
rors. The output can be set for either
0-5V, 0-10V, 0-1mA, 0-20mA or
4-20mA.
Advanced digital technology allows
the DRG-SC-FR to be field config-
ured for virtually any frequency input
to DC signal output within the ranges
specified. Calibration utilizes ‘Touch-
Sample’ technology where the user
simply applies the minimum and maxi-
mum input frequencies, touching a
recessed button to configure the cor-
responding minimum and maximum
output range.
The very narrow DRG Series housing
enables installations of up to 24 unit
per linear foot. The wide ranging
power supply is inverter isolated and
accepts any voltage between 9 and
30VDC.
APPLICATION
The DRG-SC-FR field configurable
frequency input signal conditioner 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 ASIC technology, provides a stable
output at low frequencies for higher
accuracy, and three way isolation
which completely eliminates ground
loops from any source.
‘TOUCH-SAMPLE’
TECHNOLOGY
The DRG-SC-FR utilizes ‘Touch-
Sample’ technology which greatly
simplifies configuration. To set the
input frequency range, the user simply
applies the high input frequency and
pushes the CAL button while the IN-
PUT LED is lit. The low input frequency
is then input and pushing the CAL
button 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.
To precisely adjust the output, the user
adjusts the input frequency 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 DRG-SC-FR utilizes three status
LEDs. One is to display the frequency
level of the input signal and the other
two are used while calibrating the de-
vice.
The green LEVEL (LVL) LED is on (or
flashing) when there is a signal being
sensed at the input to the device and in
the calibration mode. Its intensity
varies with the frequency of the input
signal during normal operation.
The yellow INPUT (IN) LED, when on,
denotes input programming modes.
The red OUTPUT (OUT) LED, when
on, denotes output programming modes
(see Configuration, Calibration and
Figure 4 for details).
CONFIGURATION
A major advantage of the DRG-SC-
FR is its wide ranging capabilities
and ease of configuration. The DRG-
SC-FR 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 fac-
tory presets the Model
DRG-SC-FR as follows:
Input Range:
0 to 1000Hz
Sensitivity:
1Vrms
Output Range:4 to 20mA
Note: Sensitivity refers to the noise
rejection level or the trigger thresh-
old of the input.
The DC power input accepts any DC
source between 9 and 30V, typically
a 12V or 24VDC source is used.
For other I/O ranges, refer to
Table 1 for output range (SW1) switch
settings and Figure 5 for sensitivity
switch setting. For quick and easy
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 output switch selector
(SW1).
2. Set the input sensitivity switch to
LO for input amplitudes between
150mVp and 50Vrms, with noise
rejection to 1Vp. Set SW2 to HI for
input amplitudes between 500mVp
and 150Vrms, with noise rejection up
to 10Vp.
DRG-SC-FR
Frequency Input, Field Configurable Signal Conditioner
Instruction Sheet M2392/0796
SPECIFICATIONS
Input
Voltage Input
Full Scale Range: 10mV to
±200mV (Table 1).
Impedance: >1M
Ω
Overvoltage: 400Vrms, max.
(intermittent); 264Vrms, max.
(continuous).
Common Mode (Input to Ground):
1800VDC, max.
Zero Turn-Up: 50% of full scale
range
Span Turn-Down: 50% of full
scale range
Operation: direct or reverse
acting
Output
Voltage Output
Output: 0-5V, 0-10V
Impedance: <10
Ω
Drive: 10mA, max.
(1K
Ω
, min. @ 10V)
Current Output
Output: 0-1mA, 0-20mA,
4-20mA
Impedance: >100K
Ω
Compliance:
0-1mA; 7.5V, max.(7.5K
Ω
, max.)
0-20mA; 12V, max. (600
Ω
, max.)
4-20mA; 12V, max. (600
Ω
max.)
Bridge Excitation
1 to 10VDC, 120mA max.
Accuracy (Including Linearity, Hyster-
esis)
±0.1% typical, ±0.2% maximum
of selected range at 25°C.
Stability
±0.025%/°C typical, 0.05%/°C
maximum, of selected full scale
range.
Output Noise (maximum)
0.1% of span, rms, or 10mV
whichever is greater.
Response Time (10 to 90%)
<200mSec., typical.
Common Mode Rejection
DC to 60Hz:³120dB
³100dB (0 -1mA, range)
Isolation
1800VDC between input, output
and power.
EMC Compliance
Emmissions: EN50081-1
Immunity: EN50082-2
Safety:EN50178
LED Indication (green)
Input Range (approx.)
>110% input: 8Hz flash
<0% input: 4Hz flash
Humidity ( Non-Condensing)
Operating: 15 to 95% (@ 45°C)
Soak: 90% for 24 hours (@ 65°C)
Temperature Range
1
Operating: 0 to 55°C (32 to
131°F)
Storage: -25 to 70°C
(-13 to 158°F)
Power
Consumption: 1.5W typical, 2.5W
max. (one 350
Ω
bridge), 4W max.
(four 350
Ω
bridges).
Range: 18 to 30VDC
Wire Terminations
Screw terminals for 12-22 AWG
Mounting:
32mm or 35mm DIN Rail
Agency Approvals
CSA certified per standard C22.2,
No. 0-M91 and 142-M1987 (File No.
LR42272) UL recognized per standard
UL508 (File No.E99775). CE Con
formance per EMC directive 89/336/
EEC and low voltage 73/23/EEC.
PIN CONNECTIONS
11 DC Power (+)
12 DC Power (-)
13 No Internal Connection
21 DC Power (+)
22 DC Power (-)
23 No Internal Connection
41 Bridge Input (+)
42 Bridge Input (-)
43 Excitation (+)
51 Output (+)
52 Output (-)
53 Excitation (-)
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WARRANTY/DISCLAIMER
RETURN REQUEST/ INQUIRIES
Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department. BEFORE RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER
MUST OBTAIN AN AUTHORIZED RETURN (AR) NUMBER FROM OMEGA'S CUSTOMER SERVICE DEPARTMENT (IN ORDER TO AVOID PROCESSING
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FOR WARRANTY RETURNS, please have the following information
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1.
P.O. number under which the product was PURCHASED,
2.
Model and serial number of the product under warranty, and
3.
Repair instructions and/or specific problems relative to the product
OMEGA ENGINEERING, INC. warrants this unit to be free of manufacturing defects for the life of the product.
If the unit should malfunction, it must be returned to the factory for evaluation. OMEGA's Customer Service Department will issue an Authorized Return (AR) number
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FOR NON-WARRANTY REPAIRS, consult OMEGA for current repair
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1.
P.O. number to cover the COST of the repair,
2.
Model and serial number of product, and
3.
Repair instructions and/or specific problems relative to the product.
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OMEGA is a registered trademark of OMEGA ENGINEERING, INC.
ã Copyright 1996 OMEGA ENGINEERING, INC. All rights reserved. This documentation may not be copied, photocopied, reproduced, translated, or reduced to any
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The information contained in this document is believed to be correct but OMEGA Engineering, Inc. accepts no liability for any errors it contains, and reserves the right to alter
specifications without notice.
WARNING: These product are not designed for use in, and should not be used for, patient connected applications.
721-0611-00A 8/96
