Absolute Process Instruments DuoPak APD 2057 D Handbuch - Seite 2
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Instructions
Precautions
WARNING! All wiring must be performed by a qualified electrician
or instrumentation engineer. See diagram for terminal designa-
tions and wiring examples. Consult factory for assistance.
WARNING! Avoid shock hazards! Turn signal input, output, and
power off before connecting or disconnecting wiring, or removing
or installing module.
Précautions
ATTENTION! Tout le câblage doit être effectué par un électricien
ou ingénieur en instrumentation qualifié. Voir le diagramme pour
désignations des bornes et des exemples de câblage. Consulter
l'usine pour assistance.
ATTENTION! Éviter les risques de choc! Fermez le signal d'entrée,
le signal de sortie et l'alimentation électrique avant de connecter
ou de déconnecter le câblage, ou de retirer ou d'installer le module.
Electrical Connections
Polarity must be observed for signal wiring connections. If the
input and/or output do not function, check wiring and polarity.
Each product is factory configured to your exact input and output
ranges as indicated on the serial number label.
Outputs
For milliamp ranges determine if your devices provide power to
the current loop or if the loop must be powered by the APD mod-
ule. Typical voltage may be 9-24 VDC at your device's terminals if
it provides power to the loop.
Device for Output Channel 1
Voltage input device.
Unpowered or passive mA input device.
APD module provides the loop power.
mA input device powers the current loop.
Device for Output Channel 2
Voltage input device.
Unpowered or passive mA input device.
APD module provides the loop power.
mA input device powers the current loop.
Input 1, Bridge, Strain Gauge, Load Cell
Refer to wiring diagram at right and strain gauge manufacturer's
data sheet for wiring and color-coding. Polarity must be observed
when connecting input. Sensor shield wire (if equipped) should be
grounded at one end only.
The excitation voltage is factory set and should match the sen-
sor manufacturer's recommendations. A front potentiometer
allows approximately ±10% fine adjustment of the excitation
voltage.
CAUTION: Never short the excitation leads together. This
will cause internal damage to the module.
Bridge Input Channel 1
– Terminal + Terminal
17
Strain gauge signal input
18 (–)
Excitation voltage
Input 2, Frequency
The input range is pre-configured at the factory. No input calibra-
tion is necessary. The frequency input is compatible with most
types of sensors that product a minimum 100 mV amplitude
change and a minimum 5 microsecond pulse width.
A 15 VDC supply is available to power the sensor if required.
Always refer to the sensor manufacturer's data sheet to deter-
mine supply voltage compatibility and proper wiring.
Signal
Frequency Sensor Ch. 2
Com.
2 wire or Namur
n/a
22
requiring external power
2 wire self generating (VR)
21 (–)
3 wire PNP or NPN
21 (–)
22
Sensor Load
The frequency signal input is capacitively coupled to prevent any
DC in the input. Some sensors, typically those without an internal
load resistor, require a resistive load in order to function.
The resistor value may be specified by the sensor manufacturer
as the "minimum resistive load" or calculated from the sensor
manufacturer's specified "load current range".
The 15 VDC power supply is capable of providing 25 mA. A load current
range of 3 mA to 25 mA would typically use a 5 kΩ to 500 Ω resistor.
Module Power Terminals
Check label for module operating voltage to make sure it matches
available power. The power supplies are fuse protected and the
unit may be returned to API for fuse replacement.
When using DC power, either polarity is acceptable, but for
consistency, wire positive (+) to terminal 25 and negative (–) to
terminal 28.
BSOLUTE
Mounting to a DIN Rail
Install module vertically on a 35 mm DIN rail in a protective enclo-
sure away from heat sources. Do not block air flow.
1. Tilt front of module down and position
the lower spring clips against the bot-
tom edge of DIN rail.
2. Push front of module upward until
upper mount snaps into place.
Removal
Avoid shock hazards! Turn signal
input, output, and power off.
1. Push up on bottom back of module.
2. Tilt front of module downward to
release upper mount from top edge
of DIN rail.
3. The module can now be removed
from the DIN rail.
Calibration
Front-mounted Zero and Span poten-
tiometers for each channel can be used to compensate for load
and lead variations.
1. Apply power to the module and allow a minimum 30 minute
warm up time.
2. Using an accurate voltmeter on terminals 18 and 20 adjust the
Terminal Terminal
excitation voltage fine adjustment potentiometer to the strain
gauge manufacturer's recommended value.
3 (–)
4
(+)
3. Using an accurate calibration source, provide an input to the
3 (–)
4
(+20 V)
module equal to the minimum input required for the application.
4. Using an accurate measurement device for the output, adjust
2 (–)
3
(+)
the Zero potentiometer for the exact minimum output desired.
Terminal Terminal
The Zero control should only be adjusted when the input signal
is at its minimum. This will produce the corresponding minimum
7 (–)
8
(+)
output signal. Example: for a 4-20 mA output, set the Zero
control to 4 mA.
7 (–)
8
(+20 V)
5. Set the input at maximum, and then adjust the Span pot for the
6 (–)
7
(+)
exact maximum output desired. The Span control should only
be adjusted when the input signal is at its maximum. This will
produce the corresponding maximum output signal. Example:
for 4-20 mA output, set the Span control to 20 mA.
6. Repeat adjustments for both channels for maximum accuracy.
Ch. 2 Sensitivity Adjustment
This multi-turn potentiometer provides an adjustable threshold
level that the incoming signal must overcome before an output
can be produced. This is used to limit noise and minimize false
input signals that may cause erroneous readings.
Fully clockwise: (max. sensitivity), input threshold is ±25 mV.
Fully counterclockwise: (min. sensitivity), input threshold is ±2.5 volts.
Output Test Function
(+)
19 (–)
When the Test button is depressed it will drive the output with a
20
(+)
known good signal that can be used as a diagnostic aid during
initial start-up or troubleshooting. When released, the output will
return to normal.
Each Test Cal. potentiometer is factory set to approximately 50%
output. Each can be adjusted to set the test output from 0 to 100%
of the output span. Press and hold the Test button and adjust the
corresponding Test Cal. potentiometer for the desired output level.
They may optionally be externally wired for remote test operation or
a manual override. See wiring diagram at right.
Sensor
Signal
Operation
Power
Input
T
he APD 2057 accepts one strain gauge input and one frequency
input and provides two optically isolated DC voltage or current
(+15 V)
23
(+)
outputs that are linearly related to the inputs.
n/a
23
(+)
Green LoopTracker
(+15 V)
23
(+)
each signal is being sensed by the input circuitry of the module.
They also indicates the input signal strength by changing in inten-
sity as the process changes from minimum to maximum.
If an LED fails to illuminate, or fails to change in intensity as the
process changes, check the module power or signal input wiring.
Two red LoopTracker output LEDs provide a visual indication that the
output signals are functioning. They become brighter as the input
and each corresponding output change from minimum to maximum.
For a current output the red LED will only light if the output loop
current path is complete. For either current or voltage outputs,
failure to illuminate or a failure to change in intensity as the pro-
cess changes may indicate a problem with the module power or
signal output wiring. Note that it may be difficult to see the LEDs
under bright lighting conditions.
API maintains a constant effort to upgrade and improve its prod-
ucts. Specifications are subject to change without notice. Consult
factory for your specific requirements.
ROCESS NSTRUMENTS, Inc.
Upper Mount
Spring Clips
®
input LEDs provide a visual indication that
1220 American Way Libertyville, IL 60048
800-942-0315
Phone:
APD 2057
Voltage
Device 1
–
+
Voltage
Output
1
2
3
4
Ch. 1
mA
Device 1
R
i
+
–
Loop
Loop
Power
Power
Source 1
Source 2
–
+
Current
Sinking
1
2
3
4
Output
Ch. 1
mA
Device 1
R
i
–
+ 20V
Current
Sourcing
Output
1
2
3
4
Ch. 1
External
Contacts
for Test
Function
9
10
11 12
Channel 1
Excitation
Sensitivity
Output
Loop
Test Cal.
Tracker
Test
Span
Input
Loop
Zero
Tracker
APD 2057
Channel 1
Strain Gauge to DC
Isolated Transmitter
17
18
19 20
2 wire using 15 V supply
bleed resistor is required
Strain
gauge
See manufacturer's
specifications for
wiring designations.
2 wire self-generating
Shield wires should
be grounded at one
end only.
See sensor specs. if load
–
To maintain full isola-
tion avoid combining
power supplies in
common with inputs,
outputs, or unit power.
load resistor is required
Cu 60/75°C
25
26
27
28
conductors
14 AWG
28 Power AC or DC –
max.
26 Earth Ground
25 Power AC or DC +
api-usa.com
Fax: 800-949-7502
Voltage
Device 2
–
+
5
6
7
8
Ch. 2
mA
Device 2
R
i
+
–
–
+
5
6
7
8
Ch. 2
mA
Device 2
R
i
–
+ 20V
5
6
7
8
Ch. 2
13
14
15 16
®
Channel 2
Output
Loop
Test Cal.
Tracker
Test
Span
Input
Loop
Zero
Tracker
Channel 2
Frequency to DC
Isolated Transmitter
21
22
23
24
–
+Sig
2 Wire
15 kΩ typ.
See sensor specs. if
21
22
23
24
+Sig
–
2 Wire
21
22
23
24
–
+Sig
Load resis.
NPN
3 wire NPN
resistor is required
21
22
23
24
+Sig
PNP
Load resis.
3 wire PNP
See sensor specs. if