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 remov-
ing or installing module.
Précautions
ATTENTION! Tout le câblage doit être effectué par un élec-
tricien ou ingénieur en instrumentation qualifié. Voir le dia-
gramme 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.
Range Selection
See model/serial number label for any applicable options or
custom ranges. It is generally easier to select ranges before
wiring and installation.
See table on next page for module range settings. From the
table, find the rotary switch setting that matches your input
and output range.
For most applications 0-100% of the potentiometer range is
used. The APD 4008 can be set up to use part of the potenti-
ometer range.
Input switch Bcontrols the percent of the potentiometer range
to use.
Input switch Ccontrols the percent of the range offset from zero.
Switch Dcontrols output offset.
Make sure to set the V—I switch for voltage or current output
respectively.
Input
The potentiometer must be connected to all three signal input
terminals as shown. The APD 4008 utilizes a stable 1 VDC
source to excite the potentiometer.
Output
Polarity must be observed for output wiring connections. If the
output does not function, check switch settings and wiring polarity.
If your device requires a current input, determine if it provides
power to the current loop or if it must be powered by the APD
module.
Use a multi-meter to check for voltage at your device input
terminals. Typical voltage may be in the range of 9 to 24 VDC.
In this case, wire the device to module terminals 2 and 3.
Module Power
Check model/serial number label for module operating voltage
to make sure it matches available power.
When using DC power, either polarity is acceptable, but for
consistency with similar API products, positive (+) can be wired
to terminal 13 and negative (–) can be wired to terminal 16.
Mounting to a DIN Rail
Install module vertically on a 35 mm
DIN rail in a protective enclosure away
from heat sources. Do not block air
flow. Allow 1" (25 mm) above and
below housing vents for air circulation.
1. Tilt front of module downward and
position against DIN rail.
2. Clip lower mount to bottom edge of
DIN rail.
3. Push front of module upward until
upper mount snaps into place.
Removal
1. Push up on the bottom back of the
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
Input and output ranges, if specified on your order, are factory
pre-configured (at 24°C ±1°C). Use the front-mounted Zero
and Span potentiometers to calibrate the output.
Note: Perform the following calibration procedure any time
switch settings are changed.
1. Apply power to the module and allow a minimum 20 minute
warm up time.
2. Set the input potentiometer to its minimum value to provide
a minimum input to the module.
3. Connect an accurate measurement device to the module
output. Adjust the module’s Zero potentiometer for the
exact minimum output desired. The Zero control should
only be adjusted when the input signal is at its minimum
to produce the corresponding minimum output signal. For
example: 4 mA for a 4-20 mA output or –10 V for a ±10V
output.
4. Set the input potentiometer at its maximum, and then
adjust the module’s Span pot for the exact maximum output
desired. The Span control should only be adjusted when the
input signal is at its maximum. This will produce the cor-
responding maximum output signal. Example: for 4-20 mA
output signal, the Span control will provide adjustment for
the 20 mA or high end of the signal.
5. Repeat adjustments for maximum accuracy.
Output Test Function
The output test potentiometer is factory set to provide approxi-
mately 50% output. When the test button is depressed it will
drive the output side of the loop with a known good signal that
can be used as a diagnostic aid during initial start-up or trou-
bleshooting. When released, the output will return to normal.
The Test Cal. potentiometer can be used to set the test output
to the desired level. It is adjustable from 0 to 100% of the
output span. Press and hold the Test button and adjust the Test
Cal. potentiometer for the desired output level.
Operation
The APD 4008 utilizes a stable 1 VDC source to excite the
potentiometer. This voltage is stabilized against the potentiom-
eter resistance value variations over the entire operating range.
The resulting potentiometer wiper voltage is amplified and
passed through an optical coupler to the output stage where it
is scaled to the desired output range.
The green LoopTracker®input LED provides a visual indication
that a signal is being sensed by the input circuitry of the mod-
ule. It also indicates the input signal strength by changing in
intensity as the process changes from minimum to maximum.
If the LED fails to illuminate, or fails to change in intensity as
the process changes, check the module power or signal input
wiring. Note that it may be difficult to see the LEDs under bright
lighting conditions.
The red LoopTracker output LED provides a visual indication
that the output signal is functioning. It becomes brighter as
the input and the corresponding output change from minimum
to maximum.
For current outputs, 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
process changes may indicate a problem with the module
power or signal output wiring.
Installation and Setup APD 4008
Potentiometer Input Terminal
Full scale or high side of potentiometer 9 (+1 VDC)
Zero or low end of potentiometer 10 (–)
Potentiometer wiper arm 11
65 7 8
13 Power AC or DC +
14 Earth Ground
16 Power AC or DC –
1413 15 16
Test Cal.
Span
Zero
Test
Output
Input
Loop
Tracker
APD 4008
Potentiometer to DC
Isolated Transmitter
Loop
Tracker
109 11 12
9 Full Scale
11 Wiper Arm
10 Minimum
Potentiometer
Type of Device for Output – Terminal + Terminal
Measuring/recording device
accepts a voltage input. 3 (–)
4 (+)
switch E
set to “V”
Device accepts a mA (current)
input and the input is unpow-
ered or passive. APD module
provides the loop power.
3 (–)
4 (+20 V)
switch E
set to “I”
Device accepts a mA (current)
input and provides power to the
current loop.
2 (–)
3 (+)
switch E
set to “I”
21 3 4
Voltage Output
– +
+
–
Voltage
Device
2134
– +
Powered
4-20 mA
Device
Current Sinking Output
switch Eset to “I”
External device provides
loop power
Current Sinking Output
switch E set to “I”
External loop supply
2134
– +
+–
Loop
Power
Source
+
–
4-20 mA
Device
Ri
Cu 60/75°C
conductors
14 AWG
max.
To maintain full isolation
and avoid malfunctions,
do not connect power
supplies in common
with input, output or unit
power.
Do not connect anything
to unused terminals.
12 3 4
5 6 7 8
9 10 11 12
13 14 15 16
Input
Not used
Output
Power
21 3 4
Current Sourcing Output
Set switch Eto “I”
Passive
Current
Device
+20 V
– +
Not used
api-usa.com
1220 American Way Libertyville, IL 60048
Phone: 800-942-0315 Fax: 800-949-7502
AABSOLUTEBSOLUTE PPROCESSROCESS IINSTRUMENTSNSTRUMENTS
Wire terminal
torque
0.5 to 0.6
Nm or
4.4 to 5.3
in-lbs
API maintains a constant effort to upgrade and improve its products.
Specifications are subject to change without notice. See api-usa.com for
latest product information. Consult factory for your specific requirements.
WARNING: This product can expose you to chemicals includ-
ing nickel, which are known to the State of California to cause
cancer or birth defects or other reproductive harm. For more
information go to www.P65Warnings.ca.gov
Module mA output is
unpowered
Module mA output is
unpowered
Module powers mA output loop
* Do not make connections
to unused terminals!
Spring
Clip
Upper
Mount
Lower
Mount
* To avoid
damage to the
module, do
not make any
connections to
unused terminals
