Omega Products DRG-SC-FR Installation Manual

SPECIFICATIONS

Input

Voltage Input
Full Scale Range: 10mV to
±200mV (Table 1).
Impedance: >1MΩ
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: <10Ω

Drive: 10mA, max.

(1KΩ, min. @ 10V)

Current Output

Output: 0-1mA, 0-20mA,

4-20mA
Impedance: >100KΩ
Compliance:

0-1mA; 7.5V, max.(7.5KΩ, max.)

0-20mA; 12V, max. (600Ω, max.)

4-20mA; 12V, max. (600Ω max.)

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Bridge Excitation

1 to 10VDC, 120mA max.
Accuracy (Including Linearity, Hyster­esis)

±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

Operating: 0 to 55°C (32 to

131°F)

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
immediately upon phone or written request. Upon examination by OMEGA, if the unit is found to be defective it will be repaired or replaced at no charge. OMEGA's
WARRANTY does not apply to defects resulting from any action of the purchaser, including but not limited to mishandling, improper interfacing, operation outside of design
limits, improper repair, or unauthorized modification. This WARRANTY is VOID if the unit shows evidence of having been tampered with or shows evidence of being damaged
as a result of excessive corrosion; or current, heat, moisture or vibration; improper specification; misapplication; misuse or other operating conditions outside of OMEGA's
control. Components which wear are not warranted, including but not limited to contact points, fuses, and triacs.

OMEGA is pleased to offer suggestions on the use of its various products. However, OMEGA neither assumes responsibility for any omissions or errors nor assumes liability
for any damages that result from the use of its products in accordance with information provided by OMEGA, either verbal or written. OMEGA warrants only that the parts
manufactured by it will be as specified and free of defects. OMEGA MAKES NO OTHER WARRANTIES OR REPRESENTA TIONS OF ANY KIND WHA TSOEVER,
EXPRESSED OR IMPLIED, EXCEPT THAT OF TITLE, AND ALL IMPLIED WARRANTIES INCLUDING ANY W ARRANTY OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. LIMIT ATION OF LIABILITY : The remedies of purchaser set forth herein are exclusive and the total liability
of OMEGA with respect to this order, whether based on contract, warranty, negligence, indemnification, strict liability or otherwise, shall not exceed the purchase price of
the component upon which liability is based. In no event shall OMEGA be liable for consequential, incidental or special damages.

CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor shall it be used: (1) as a "Basic Component" under 10 CFR 21 (NRC), used in or with any nuclear
installation or activity; or (2) in medical applications or used on humans. Should any Product(s) be used in or with any nuclear installation or activity, medical application,

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used on humans, or misused in any way, OMEGA assumes no responsibility as set forth in our basic WARRANTY/DISCLAIMER language, and additionally, purchaser will
indemnify OMEGA and hold OMEGA harmless from any liability or damage whatsoever arising out of the use of the Product(s) in such a manner.

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
DELAYS). The assigned AR number should then be marked on the outside of the return package and on any correspondence.
The purchaser is responsible for shipping charges, freight, insurance and proper packaging to prevent breakage in transit.

FOR WARRANTY RETURNS, please have the following information
available BEFORE contacting OMEGA:

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's policy is to make running changes, not model changes, whenever an improvement is possible. This affords our customers the latest in technology and
engineering.
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
electronic medium or machine-readable form, in whole or in part, without prior written consent of OMEGA ENGINEERING, INC.

It is the policy of OMEGA to comply with all worldwide safety and EMC/EMI regulations that apply. OMEGA is constantly pursuing certification of its products to the European
New Approach Directives. OMEGA will add the CE mark to every appropriate device upon certification.
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.

Storage: -25 to 70°C

(-13 to 158°F)

Power

Consumption: 1.5W typical, 2.5W

max. (one 350Ω bridge), 4W max.
(four 350Ω bridges).

Range: 18 to 30VDC

Wire Terminations

Screw terminals for 12-22 AWG

Mounting:

32mm or 35mm DIN Rail

DRG-SC-FR
Frequency Input, Field Configurable Signal Conditioner

Instruction Sheet M2392/0796

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 (-)

1

DESCRIPTION

The Model DRG-SC-FR 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 DRG-SC-FR can be
configured for any frequency span
from 2Hz to 10,000Hz. Pulse thresh­old sensitivity can be adjusted from
50mVp to 150Vrms to ensure accu­rate frequency measurement and
minimize transient noise related er­rors. The output can be set for either
0-5V, 0-10V, 0-1mA, 0-20mA or
4-20mA.

WARRANTY/DISCLAIMER

Advanced digital technology allows
the DRG-SC-FR to be field config­ured for virtually any frequency input
to DC signal output within the ranges
specified. Calibration utilizes ‘Touch­Sample’ 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.

The very narrow DRG Series housing
enables installations of up to 24 unit

RETURN REQUEST/ INQUIRIES

per linear foot. The wide ranging
power supply is inverter isolated and
accepts any voltage between 9 and

FOR NON-WARRANTY REPAIRS, consult OMEGA for current repair
charges. Have the following information available BEFORE contacting OMEGA:

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.

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 mag­netic 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 ‘Touch­Sample’ 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 IN­PUT 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 de­vice.

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-SC­FR is its wide ranging capabilities
and ease of configuration. The DRG­SC-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 9998­10,000Hz/4-20mA).

Unless otherwise specified, the fac­tory 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 thresh­old 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.

721-0611-00A 8/96

CALIBRATION

1. After configuring the DIP switches,
connect the input to a calibrated
frequency source. Connect the out­put to the actual device load (or a load
approximately equivalent to the ac­tual device load value) and apply
power (see wiring diagram, Figure

2).

Note: To maximize thermal stability,
final calibration should be performed
in th operating installation, allowing
approximately 1 to 2 hours for warm
up and thermal equilibrium of the
system.

2. Adjust the input frequency to the
desired maximum and observe that
the green LEVEL LED increase in­tensity as the frequency is increased.
If this is not observed, turn the sensi­tivity potentiometer in a counter clock­wise direction until the green LEVEL
LED varies with frequency.

Note: The LEVEL LED may not ap­pear to be on, if the new range is less
than 10% of the previously cali­brated range.

3. With the green LED illuminated
press the CAL button once to enter
the calibration mode. The yellow and
green LEDs should now be on.

WARNING: Do not attempt to
change any DIP SWITCH settings
for the output (SW1) while power is
applied. Severe damage will result!

4. Input the maximum desired fre­quency (if not done already) and
press the CAL button to store. The
yellow INPUT LED should now be the
only LED on.

5. Input the minimum desired fre­quency and press the CAL button to
store. The green and red LEDs should
now be on.

Note: The most reliable way to input
0Hz is to short circuit the input pins
(42 and 41)

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. The yellow and Red
LEDs should be on. The green LED
should be dim.

8. Press the CAL button one final time
to exit the calibration mode. The
green LED should now be on and its
intensity should increase with an in­creasing input frequency.

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 prior to Step 8 will restore
previous settings and calibration.

OPTIMAL SENSITIVITY

If the amplitudes 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 counter­clockwise(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, when 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.

Figure 1: Factory Calibration;

0 to 1,000Hz, 1Vrms, 4-20mA

WARNING: Do not attempt to
change any switch settings with
power applied. Severe damage
may occur!

Figure 2: Wiring Diagram for DRG-SC-FR

Table 1: Output Switch
Settings (SW1, 1 through 8)

Note1: All DRG series modues are designed and tested to operate in ambient temperatures from 0 to 55°C, when mounted on a
horizontal DIN rail. When five or more modules are mounted on a vertical rail, circulating air or model DGR-HS01 Heat Sink is
recommended.

Figure 3: Mechanical Dimensions for DRG-SC-FR

Figure 5: Input Sensitivity

Settings (SW1, 9 & 10)

Figure 4: DRG-SC-FR Calibration

Flow Chart