Dwyer WWDP - Manual (Page 2)

ELECTRICAL TERMINATION
Wiring: 2-Wire - 4 to 20 mA (Current Output) and Remote Zero
The Series WWDP when configured as a current output transducer is a
true 2-wire, 4-20 mA current output device and delivers rated current into
any external load of 0-1000 ohms.
When configured as a 4-20 mA current output device, the current flow is
in one direction only. PLEASE OBSERVE POLARITY.
We suggest that an electrical cable shield be connected to the system’s
loop circuit ground to improve electrical noise rejection.
Min. Supply Voltage: 12 + .02 x (Resistance of receiver plus line)
Max. Supply Voltage: 30 + .004 x (Resistance of receiver plus line)
Note: The Zero terminals, connected to digital output, provide contact closure
relay for automatic reset to zero pressure by the monitoring system. CAUTION:
ZERO input is for dry contact, do not apply voltage to ZERO Terminals.
©Copyright 2014 Dwyer Instruments, Inc. Printed in U.S.A. 5/14 FR# R8-443565-00 Rev. 2
A B C D A B C D ZERO
OUTPUT RANGES
DC Power
Supply
Controller
Current
(4-20 mA)
Relay
EXC. OUT COM
A B C D A B C D
BAR
A.REV
SLOW
BI-DIR
SWAP
PSI
NORM
FAST
UNI-DIR
NORM WWDP-1
WWDP-2
WWDP-3
50
100
250
25
50
125
10
20
50
5
10
25
4-20 0-5 0-10 1-5
Figure 2
DC/AC
Power Supply
Controller
Voltage
Relay
A B C D A B C D
A B C D A B C D
WWDP-1
WWDP-2
WWDP-3
50
100
250
25
50
125
10
20
50
5
10
25
4-20 0-5 0-10 1-5
PSI
NORM
FAST
UNI-DIR
NORM
BAR
A.REV
SLOW
BI-DIR
SWAP
EXC. OUT COM
Figure 3
Important: Prior to putting the unit into service, press the “Zero”
button, then use the “Range Selection Switch” to select a range.
After selecting a range, press the “Zero” button again. For
instructions regarding operation of the Series WWDP, please refer
to the following, Operation.
OPERATION
Range Selection Switch
Auto Zero Button Electrical Output Configuration
Electrical Connections
WWDP-1
WWDP-2
WWDP-3
A
50
100
250
B
25
50
125
C
10
20
50
D
5
10
25
A B C D A B C D ZERO
A
4-20
B
0-5
C
0-10
D
1-5
PSI
NORM
FAST
UNI-DIR
NORM
BAR
A.REV
SLOW
BI-DIR
SWAP
4-20 MA REMOTE ZERO
ETC. OUT COM
Figure 4
Range Selection Switch: The unit is set to the highest range when
calibrated. To select the other ranges, slide the switch to the right.
Important: Push “zero” button after installing the Series WWDP, and after
changing range.
Auto Zero Button: Press and hold the “ZERO” push-button for 2 seconds
to automatically reset zero or provide contact closure on “Remote Zero”,
see Figure 2 and Figure 3.
Electrical Output: The unit is set to 4-20 mA. To select another output,
move the slide switch to the right.
Electrical Connections: Electrical termination for power supply, 3-wire voltage
output and 2-wire true 4-20 mA current output, and remote zero wiring.
A.Rev/NORM: A.REV: Analog Reverse: When in reverse mode, the output
increases when the differential pressure decreases and decreases as
pressure increases. NORM: When in Normal mode, output increases as
pressure increases and decreases as pressure decreases.
SLOW/FAST: When Slow mode is selected, 5-second averaging is provided
for surge damping.
BI-DIR/UNI-DIR: Select UNI-Directional or BI-Directional mode.
Unidirectional mode measures from 0 to full scale differential pressure.
Bidirectional mode measures pressure from minus 1/2 of full scale to plus 1/2
of full scale differential pressure. Output will read 1/2 full scale when
differential pressure is zero.
SWAP/NORM: Jumper selectable Port Swap feature eliminates costly
replumbing when incorrectly installed or replaced. Go from NORMAL to
SWAP and the jumper makes the “HI” Port “LO” and the “LO” Port “HI”.
RETURNING PRODUCTS FOR REPAIR
Please contact Dwyer Instruments, Inc. before returning unit for repair to
review information relative to your application. Many times only minor field
adjustments may be necessary. When returning a product to Dwyer
Instruments, Inc., the material should be carefully packaged and shipped.
Upon final installation of the Series WWDP Differential Pressure
Transducer, no routine maintenance is required. A periodic check of
system calibration is recommended. The Series WWDP is not field
serviceable and should be returned if repair is needed (field repair
should not be attempted and may void warranty). Be sure to include a
brief description of the problem plus any relevant application notes.
Contact customer service to receive a return goods authorization
number before shipping.
Note: Please remove any pressure fittings and plumbing that you have
installed and enclose any required mating electrical connectors and wiring
diagrams.
Wiring: 3-Wire, 0 to 5, 0 to 10, 1-5 VDC and Remote Zero
The Series WWDP when configured for voltage output is a 3-wire circuit
device with three terminals available for wiring. The -Excitation and -
Output are commoned on the circuit.
Caution: Do Not Connect “+” exc to “+” out.
The Series WWDP can operate from 12-30 VDC (18-28 VAC) nominal
output power supply.
NOTE: The ZERO terminals, connected to digital output, provide a
contact closure relay for automatic reset to zero pressure by the
monitoring system. CAUTION: ZERO input is for dry contact, do not
apply voltage to ZERO Terminals.
DWYER INSTRUMENTS, INC.
Phone: 219/879-8000 www.dwyer-inst.com
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A. Fax: 219/872-9057 e-mail: [email protected]
Installation of the Series WWDP is now complete.