DFI 7000 DM
SIGNAL CONDITIONER/INDICATOR
USER’S GUIDE
www.cooperinstruments.com
PH: 540-349-4746 ● FAX: 540-347-4755
CONTENTS
1.0 DESCRIPTION .......................................................................................................................1
2.0 SPECIFICATIONS..................................................................................................................1
3.0 INSTALLATION .....................................................................................................................2
3.1 Unpacking........................................................................................................................................ 2
3.2 Mounting the Unit............................................................................................................................2
3.3 Wiring...............................................................................................................................................2
3.3.1 Power ........................................................................................................................................2
3.3.2 Transducer................................................................................................................................2
3.3.3 Output .......................................................................................................................................3
4.0 INITIAL ADJUSTMENTS/SETUP ..........................................................................................3
4.1 Calibrating the DFI 7000 DM for Operation...................................................................................3
4.1.1 Zero Adjustment....................................................................................................................... 3
4.1.2 Gain and Phase Adjustment ...................................................................................................3
4.1.3 Operative Adjustments............................................................................................................4
4.2 Changing the Signal Polarity .........................................................................................................4
5.0 OPERATIVE ADJUSTMENTS ...............................................................................................4
5.1 Options ............................................................................................................................................4
5.2 Option Card Installation .................................................................................................................4
5.3 High/Low Limits Option.................................................................................................................. 4
5.3.1 Setting the Limits .....................................................................................................................5
5.3.2 Changing the Hysteresis .........................................................................................................5
5.4 Peak Detector Option .....................................................................................................................6
5.5 Track-and-Hold Option ................................................................................................................... 6
6.0 TROUBLESHOOTING GUIDE ...............................................................................................6
7.0 WARRANTY REPAIR POLICY ..............................................................................................7
CF 72 DFI 7000 DM ii May 1996 Rev. A
1.0 DESCRIPTION
The 7000 DM is a complete 4-1/2-digit signal conditioner/indicator for LVDTs or VRTs. The unit is housed in a 1/8
DIN case and utilizes screwdriver-type power and I/ O connectors. It also provides adjustments for zero, gain,
phase, and scaling. The DM features a +/-5 volt output along with a wide input range. The options are Dual Limits,
Peak Detector, or Track-and-Hold.
2.0 SPECIFICATIONS
GENERAL
#Channels 1
Case Material Noryl Plastic
Temperature, Storage -20° F to 200° F
Temperature, Operating 0° F to 130° F
TRANSDUCER INTERFACE
Transducer Excitation 5KHz
Type of inputs accepted LVDT, VRT
Transducer Current Drive 100 mA
Input Gain Range <1 to 300
Calibration Method Manual Displacement
Zero Balance +/-15% F.S. Min.
Noise & Ripple <300 microvolts
Transducer Min. Imp. 7 ohms
AMPLIFIER CHARACTERISTICS
Full-Scale Output +/- 5 Volts
Output Impedance <2 ohms
Accuracy +/-0.2%
Frequency Response 300 Hz.
Common Mode Rejection 60 db.
Fine Span Adjust >+/-15%
Coarse Span Adjust >80%
Fine Zero Adjust >+/-15%
Coarse Zero Adjust >+/-20%
Short Circuited Protected Yes
DIGITAL DISPLAY
# Char. Displayed 4-1/2
Conversions per sec. 3
Scaling +/-19999
Scaling Method Potentiometer
Polarity Indication "-" For Negative
Decimal Pt. Selection Jumper (non-solder)
Display Size 0.56"
Overrange Indication Flashing Display
Resolution 1/20000
Type LED
PHYSICAL
Input/Output Connector Screwdriver Terminals
CHARACTERISTICS
Weight 2 lbs.
Mounting Bench, Panel, or Rack
CF 72 DFI 7000 DM 1 May 1996 Rev. A
Size 1/8 DIN
POWER SUPPLY
Power Requirements 115VAC/220VAC (factory set/field changeable)
3.0 INSTALLATION
3.1 Unpacking
The DFI 7000 is shipped in a single container, Prior to energizing it, inspect the unit for damage by gently shaking
and listening for loose components. Report shipping damage to the carrier; it is their responsibility to safely
transport the unit to the customer. If there is transportation damage and you have difficulty getting proper adjustment, contact Cooper at (800)-344-3921. We will assist in resolving the situation.
3.2 Mounting the Unit
For panel mounting, cut a rectangular horizontal hole 3.58" in width by 1.73" in height. Remove the panel mounting
brackets by unsnapping them from the sides of the DFI 7000 DM through the panel cutout and reattach the
brackets. Using a small screwdriver, tighten the bracket adjusting screws until the case is pulled tightly to the
panel. Figure 1 depicts the DM’s dimensions.
Figure 1 – DFI 7000 DM Mounting Dimensions
3.3 Wiring
All connections to the DFI 7000 DM are made through the rear-panel 15-pin connector. Terminal 1 is AC HI; terminal 15 is +EXC. This connector may be separated from the DM for wiring by gently pulling it loose. Figure 2 shows
the rear-panel connector along with its pin configuration.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
RED
YELLOW
BLUE
GREEN
Figure 2 - DFI 7000 DM control locations
REAR PANEL WITH
LIMITS OPTION OR
NO OPTION
3.3.1 Power
Connect 110V, 60 HZ AC power to pins 1 (HI), 2 (LO), and 3 (CHASSIS). Optional 220V, 50Hz AC power may also
be connected to the DM. Contact COOPER for instructions on this modification.
3.3.2 Transducer
The DFI 7000 DM will accept 4-wire LVDT or 3-wire VRT transducers. Connect either sensor type to the DFI 7000
DM by use of pins 15 (+EXC), 14 (-EXC), 13 (+SIGNAL), and 12 (-SIGNAL). For VRT transducers connect a
CF 72 DFI 7000 DM 2 May 1996 Rev. A
proper load resistance (see the transducer manual) between pins 13 and 12, and connect a jumper between pins
12 (-signal) and 11 (-output).
3.3.3 Output
A 0-5V output may be obtained from pins 10 (+OUTPUT) and 11 (-OUTPUT).
4.0 INITIAL ADJUSTMENTS/SETUP
The DFI 7000 DM may be setup for operation by adjusting the zero, span, phase, and scaling potentiometers.
Figure 3 illustrates the DFI 7000 DM’s control locations.
LIMITS BOARD
L1 POT
L2 POT
Figure 3 - DFI 7000 DM control locations
4.1 Calibrating the DFI 7000 DM for Operation
For all the described adjustments, the attached transducer should not have an applied stimulus unless noted
otherwise. For an LVDT, this means that the armature should be close to its center position.
4.1.1 Zero Adjustment
1. Remove the bezel and front panel with a small screwdriver.
2. Apply power to the unit. Ten minutes warm-up is suggested.
3. Apply a zero signal to the input. This can be done by installing a temporary jumper between the +SIGNAL (13)
and -SIGNAL (12) terminals and one between the -SIGNAL (12) and -OUTPUT (11) terminals.
4. Adjust the COARSE and FINE ZERO potentiometers to give an output voltage on terminals 10 (+OUTPUT) and
11 (-OUTPUT) of zero volts.
5. Remove the jumpers and adjust the sensor to obtain a minimum voltage reading. This step locates the
mechanical null of the transducer.
6. Adjust the FINE ZERO potentiometer for an output of zero. The display should also read zero.\
4.1.2 Gain and Phase Adjustment
Gain adjustment requires displacing the transducer a known amount. Use this known amount to calculate the
expected voltage output of the DFI 7000 DM as follows:
EXP. OUTPUT = (Known Displacement / Full-Scale Displacement) X 5V
1. Displace the transducer the known amount.
2. Use a voltmeter to monitor the output on pins 11(-OUTPUT) and 10 (+OUTPUT). Adjust the phase
potentiometer until a peak output is seen. If the polarity of the signal is not correct, it can be changed by
moving a jumper on the signal conditioner board. Refer to section 4.2 for this procedure.
3. Vary the COARSE and FINE SPAN potentiometers to give the expected voltage output, as calculated above.
4. Adjust the scaling potentiometer to give the proper meter reading while the transducer is displaced the known
amount.
CF 72 DFI 7000 DM 3 May 1996 Rev. A
4.1.3 Operative Adjustments
Transducers usually have some small amount of zero drift, usually the result of temperature change at the transducer itself. It may be necessary during normal operation to readjust the zero. This can be done by using the front
panel FINE ZERO potentiometer.
4.2 Changing the Signal Polarity
1. Unplug AC power and remove the bezel and front panel.
2. Carefully remove the unit from its housing and unplug the signal conditioner card.
3. Locate and change the POLARITY jumper. Refer to Figure 4.
4. Plug in the signal conditioner card and reassemble the unit.
+PHASE -PHASE
POLARITYJUMPER
Figure 4 - DFI 7000 DM Signal Conditioner Card
5.0 OPERATIVE ADJUSTMENTS
5.1 Options
High/Low Limits, Peak Detection, or Track-and-Hold options are available as factory or field installable cards. Due
to the small size of the DFI 7000 DM, only one of these cards can be installed in the unit.
5.2 Option Card Installation
1. Unplug AC power and remove the bezel and front panel.
2. Carefully remove the unit from its housing.
3. Remove the plug-in jumper from the otherwise empty socket parallel to the vertical Signal Conditioner Board.
Keep the jumper! It must be reinstalled on pins 6 and 7 (counting from the front) if the unit is to be used again
without an option card.
4. Plug the option card into the empty socket.
5. Reassemble the unit. Be sure to use the new front panel.
5.3 High/Low Limits Option
The DFI 7000 DM Limits Option continuously compares the transducer signal to two adjustable set points called
"limits". L1 is the high limit and L2 is the low limit. This option energizes relays when the signal level exceeds the
limit setting as illustrated in Figure 5. The relays are rated at 24V 1A, or 48V 0.5A. The relay’s contact closures
are shown in Figure 6. LED indicators, located below the limit push buttons, also light when a signal exceeds a
limit.
CF 72 DFI 7000 DM 4 May 1996 Rev. A
TRANSDUCER SIGNAL
)
)
C
(
)NC
(
9
)
HIGH LIMIT = ON
LOW LIMIT = ON
L
A
N
G
I
S
HIGH LIMIT = OFF
LOW LIMIT = ON
HIGH LIMIT = OFF
LOW LIMIT = OFF
HIGH
SETPOINT
LOW
SETPOINT
TIME
Figure 5 Limit Operation
N
LIMIT 1(L1
PIN 5
NC (PIN 6) NC (PIN 8)
COM (PIN 4) COM (PIN 7)
LIMIT 2(L2
PIN
Figure 6 Limit Closures
5.3.1 Setting the Limits
1. Unplug AC power and remove the bezel and front panel.
2. Power the unit and depress the desired limits push button (L1 or L2).
3. Adjust the proper (L1 or L2) potentiometer to give the desired value.
4. Reassemble the unit.
5.3.2 Changing the Hysteresis
1. Unplug the AC power and remove the bezel and front panel.
2. Remove the main board and unplug the limit card.
3. Locate and change the hysteresis jumper. Refer to Figure 7 for location and correct settings.
4. Reassemble the unit.
LIMIT 1
LIMIT 2
LIMIT 2
LIMIT 1
HYSTERESIS SLOPE SELECT
POSITIVE
SETPOINT
NEGATIVE
SETPOINT
Figure 7 Hysteresis Jumper Locations
CF 72 DFI 7000 DM 5 May 1996 Rev. A
5.4 Peak Detector Option
The DFI 7000 DM Peak Detector Option detects the highest positive signal value attained since the peak detector
was last reset. Reset can be accomplished by either pressing the front panel RST button or momentarily interconnecting the RESET (7) and COMMON (9) terminals on the rear connector. Further, the PEAK OUT (4) will constantly monitor the peak detector output signal, and the AMP OUT (6) and display will normally monitor the amplifier
output, but will shift to monitor the peak detector output when one of two conditions occurs:
1. The front panel PK button is pressed.
2. The MODE SEL (6) and COMMON (9) rear panel terminals are interconnected.
Shown in Figure 8 are the rear panel pin locations for the peak detector option.
.
N
O
T
T
L
L
A
A
N
N
C
C
X
E
+
G
G
X
I
I
E
S
S
-
-
+
U
P
T
U
O
-
U
P
T
U
O
+
M
M
O
C
L
T
T
E
U
S
U
S
I
O
E
O
T
.
C
.
N
.
D
O
M
P
M
A
K
A
E
P
E
S
E
R
I
O
S
L
H
A
H
C
C
A
A
C
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
Figure 8 Peak Detector Pin Locations
5.5 Track-and-Hold Option
The DFI 7000 DM Track-and-Hold option permits the DM to stop tracking an input signal upon command. This
command is initiated by the front panel HOLD button; the first push activates the feature and the next one deactivates it. When the Track-and-Hold feature is in the "hold" mode, the front HOLD light is illuminated. The "hold" feature can also be activated through the rear panel by interconnecting the COMMON (9) and HOLD (6) terminals.
The OUTPUT (10 and 11) terminals track the input signal until the "hold" mode is activated and then lock onto the
last value prior to this condition. The AMP OUT (5) terminal monitors the amplified input signal regardless of the
hold function condition. Figure 9 shows the rear panel pin connections for the Track-and-Hold option.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
Figure 9 Track-and-Hold Pin Locations
6.0 TROUBLESHOOTING GUIDE
Symptom/Problem Action/Solution
Erratic Display Check electrical connections for continuity and wiring code for pin layout. Refer to
Section 3.2
No Display, No Voltage Out Check power connections. Refer to Section 3.2.1
Blinking Display Indicates a signal level greater than full scale; check wire connections and
CF 72 DFI 7000 DM 6 May 1996 Rev. A
transducer range.
Incorrect Readout Value Check transducer range on label. Verify that system was set-up correctly. See
Section 4.0.
Refer to transducer troubleshooting guide and verify transducer operation.
Limit 1 or 2 fails to trip relay
at setpoint
Peak detector won’t reset Check installation of Peak detector Card. See Section 5.1
Track-and-Hold unit will not
hold signal when front panel
switch is pushed
Check installation of Limit Card. Section 5.1
Check wiring. See Section 5.2, Figure 6.
Check installation of Track-and-Hold card. See Section 5.1
Check wiring. See Section 5.4, Figure 8. Verify that HOLD light is coming on in
the hold mode.
7.0 WARRANTY REPAIR POLICY
Limited Warranty On Products
Any Cooper Instruments product which, under normal operating conditions, proves defective in material or in
workmanship within one year of the date of shipment by Cooper will be repaired or replaced free of charge provided
that a return material authorization is obtained from Cooper and the defective product is sent, transportation
charges prepaid, with notice of the defect, and it is established that the product has been properly installed,
maintained, and operated within the limits of rated and normal usage. Replacement or repaired product will be
shipped F.O.B. from our plant. The terms of this warranty do not extend to any product or part thereof which, under
normal usage, has an inherently shorter useful life than one year. The replacement warranty detailed here is the
buyer’s exclusive remedy, and will satisfy all obligations of Cooper whether based on contract, negligence, or
otherwise. Cooper is not responsible for any incidental or consequential loss or damage which might result from a
failure of any and all other warranties, express or implied, including implied warranty of merchantability or fitness for
particular purpose. Any unauthorized disassembly or attempt to repair voids this warranty.
Obtaining Service Under Warranty
Advance authorization is required prior to the return to Cooper Instruments. Before returning the item, contact the
Repair Department c/o Cooper Instruments at (540) 349-4746 for a Return Material Authorization number.
Shipment to Cooper shall be at buyer’s expense and repaired or replacement items will be shipped F.O.B. from our
plant in Warrenton, Virginia. Non-verified problems or defects may be subject to a $100 evaluation charge. Please
return the original calibration data with the unit.
Repair Warranty
All repairs of Cooper products are warranted for a period of 90 days from date of shipment. This warranty applies
only to those items that were found defective and repaired; it does not apply to products in which no defect was
found and returned as is or merely recalibrated. It may be possible for out-of-warranty products to be returned to
the exact original specifications or dimensions.
* Technical description of the defect: In order to properly repair a product, it is absolutely necessary for Cooper to
receive information specifying the reason the product is being returned. Specific test data, written observations on
the failure and the specific corrective action you require are needed.
CF 72 DFI 7000 DM 7 May 1996 Rev. A
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