Precautions
WARNING! All wiring must be performed by a qualified electrician or
instrumentation engineer. See diagram for terminal designations 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.
Excitation Voltage and Range Selection
It is easier to set the switches before installation. Common ranges
are listed on the module label.
1. See table below and set Excitation rotary switch
C
to the desired
voltage. The excitation voltage should match the sensor manu-
facturer’s recommendations.
2. Set Volt/Curr slide switch
A
to voltage “V” or current “I” depend-
ing on output type.
3. From the table above, find the rotary switch combination that
match your I/O range and set rotary switches
B
,
D
, and
E
.
Socket and Mounting
The module installation requires a protective panel or enclosure. Use
API 011 or finger-safe API 011 FS socket. The socket clips to a
standard 35 mm DIN rail or can be attached to a flat surface using
the two mounting holes. Provide air flow around module.
Input Terminals
Refer to diagram and strain gauge manufacturer’s data sheet for
wiring and color coding. Polarity must be observed when connect-
ing inputs. Connect up to 4 strain gauges or load cells. Sensor
shield wire (if equipped) should be grounded at one end only.
Excitation Voltage Connection
Polarity must be observed. Never short the excitation leads togeth-
er. This will cause internal damage to the module.
Sense Leads
Connect the sense leads as shown. If no sense leads are used,
jumper terminals 6 and 7.
Signal Output Terminals
Polarity must be observed when connecting the signal output.
Current output provides power to the output loop (sourcing).
Module Power Terminals
The module operating voltage shown on the model/serial number
label must match available power. AC power can be connected with
either polarity. Polarity MUST be observed for DC powered modules.
Calibration
This procedure does not account for offset or tare weight calibra-
tion. To achieve optimum results, it is recommended that the API
4059 G be calibrated using an accurate bridge simulator.
Note: Perform the following calibration procedure any time switch
settings are changed.
1. Power the module and allow a minimum 20 minute warm up time.
2. Using an accurate voltmeter across terminals 7 and 8, adjust the
excitation voltage fine adjust potentiometer to the required voltage.
3. With the input set at zero or the minimum, adjust the front Zero
pot for a zero or low-end output (for example, 4 mA for a 4-20
mA output or –10 V with a ±10 V output).
4. The zero pot may also be adjusted for a zero reading on the
output display instrumentation, e.g. control system or process
indicator. Adjusting the zero pot this way eliminates calibration
errors in the display instrumentation.
5. Set the input at maximum, and then adjust the Span potentiom-
eter 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 corresponding maximum output signal.
6. The calibration procedure should be repeated to achieve the
desired accuracy over the selected range.
Calibration, Models with Option M01 or M02
The M01 option uses a switch and a calibration resistor inside the
API module. Ensure that the correct resistance value was specified.
Note: Perform the following calibration procedure any time switch
settings are changed.
The M02 option uses a switch for the transducer's internal calibra-
tion resistor. The transducer’s calibration resistor wires are con-
nected to terminals 5 and 11 on the API 4059 G socket.
The sensor manufacturer should provide the percentage of full-
scale transducer output when using the calibration resistor.
1. Power the module and allow a minimum 20 minute warm up time.
2. Using an accurate voltmeter across terminals 7 and 8, adjust the
excitation voltage fine adjust potentiometer to the required voltage.
3. With the input set at zero or the minimum, adjust the front Zero
pot for a zero or low-end output (for example, 4 mA for a 4-20
mA output or –10 V with a ±10 V output).
4. The zero pot may also be adjusted for a zero reading on the
output display instrumentation, e.g. control system or process
indicator. Adjusting the zero pot this way eliminates calibration
errors in the display instrumentation.
5. Set the Test toggle switch to the Test position. The calibration resis-
tor is switched into the circuit to unbalance the bridge.
6. Adjust the span pot for an 80% FS output or 80% reading on the
process indicator, or per the manufacturer’s percentage of FS output.
7. Return the Test switch to the opposite position and readjust
the zero pot if necessary. The calibration procedure should be
repeated to achieve the desired accuracy over the selected range.
Using Offset Switch D
Offset switch
D
can be used to cancel or tare non-zero readings
by offsetting the low end of the input range. This can be used to
compensate for tare weights or scale deadweight to get zero output
when a load is on the platform. It can be used to compensate for
low-output sensors (e.g., < 1 mV/V) that may have large zero off-
sets. Switch
D
can realign the zero control so it has enough range
to produce the desired zero output. It can also raise the offset to
allow calibration of bi-directional sensors or lower the offset to
compensate for elevated input ranges such as 10-20 mV.
1. Switch
D
does not interact with any other switch and is the only
switch needed to correct zero offsets. Its only purpose is to adjust
or cancel effects of the low end of the input range not correspond-
ing nominally to 0 mV. Setting switch
D
to “0” results in no offset.
2. To raise the output zero, rotate switch
D
clockwise from 1
through 7 until the zero potentiometer is within range of your
desired output.
3. To lower the output zero, rotate switch
D
through ranges 9 through
F until the zero potentiometer is within range of your desired out-
put. This range is often used for elevated input ranges.
Output Test Function
Note that models with the M01 or M02 option do not have a Test
function and the Test Cal. potentiometer is non-functional.
The output test potentiometer is factory set to provide approximate-
ly 50% output. When the test button is depressed it will drive the
output with a 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.
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. potentiom-
eter for the desired output level.
Operation
Strain gauges and load cells are commonly referred to as bridges due
to their four-resistor Wheatstone bridge configuration. These sen-
sors require a precise excitation source to produce an output that is
directly proportional to the load, pressure, etc. applied to the sensor.
The exact output of the sensor (measured in millivolts) is deter-
mined by the sensitivity of the sensor (mV/V) and the excitation
voltage applied. For example, a load cell rated for 3 mV/V sensitivity
and 10 VDC excitation will produce an output of 0 to 30 mV for load
variations from 0 to 100%.
3
mV/V sensitivity X
10
VDC excitation =
30
mV range
The module provides a precise excitation voltage to the sensors
and receives the resulting millivolt signal in return. The input signal
is filtered and amplified, then offset if required, and passed to the
output stage. An isolated DC voltage or current output is generated.
GREEN LoopTracker
®
Input LED –
Provides a visual indication
that a signal is being sensed by the input circuitry of the module. It
also indicates the input signal level by changing in intensity as the
process changes from minimum to maximum. If the LED fails to illu-
minate, or fails to change in intensity as the process changes, this
may indicate a problem with module power or signal input wiring.
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.
Instructions
API 4059 G
Excitation 10V 9V 8V 7V 6V 5V 4V 3V 2V 1V 0V
Switch C A
9
8
7
6
5
4
3
2
1
0
Exc.
(–)
V
0
+
V
EX
+
V
EX
–
V
0
–
3
2
1
11
10
9
8
7
6
5
4
Strain
gauge
PLC,
Display,
Recorder,
Etc.
Power
AC or
DC–
Power
AC or
DC+
(–)
Output
Module
power
When using the
mA output the API
4059 G provides
20 V loop power
Sense
(–)
Sense –
Sense (
+)
Jumper
6 and 7
ONLY if
sense
leads are
NOT used
Load cell
with built-in
calibration
resistor
used with
M02 option
Exc.
(+)
Sig.
(+)
Sig.
(–)
To M02
calibration
resistor switch
(+)
Socket
top view
Key down
when panel
mounting
Output 0-1
V
0-2
V
0-4
V
1-5
V
0-5
V
0-8
V
2-10
V
0-10
V
±5
V
±10
V
0-2
mA
2-10
mA
0-10
mA
0-16
mA
4-20
mA
0-20
mA
Switches ABDE ABDE ABDE ABDE ABDE ABDE ABDE ABDE ABDE ABDE ABDE ABDE ABDE ABDE ABDE ABDE
0-5 mV
V002 V802 V102 V602 V902 V202 V702 V302 V402 V502 I007 I602 I902 I202 I702 I302
±10 mV
V033 V833 V133 V633 V933 V233 V733 V333 V433 V533 I033 I633 I933 I233 I733 I333
0-10 mV
V00A V80A V10A V60A V90A V20A V70A V30A V40A V50A I00A I60A I90A I20A I70A I30A
±20 mV
V03B V83B V13B V63B V93B V23B V73B V33B V43B V53B I03B I63B I93B I23B I73B I33B
0-20 mV
V003 V803 V103 V603 V903 V203 V703 V303 V403 V503 I003 I603 I903 I203 I703 I303
0-25 mV
V006 V806 V106 V606 V906 V206 V706 V306 V406 V506 I006 I606 I906 I206 I706 I306
0-30 mV
V00E V80E V10E V60E V90E V20E V70E V30E V40E V50E I00E I60E I90E I20E I70E I30E
0-40 mV
V00B V80B V10B V60B V90B V20B V70B V30B V40B V50B I00B I60B I90B I20B I70B I30B
0-50 mV
V000 V800 V100 V600 V900 V200 V700 V300 V400 V500 I000 I600 I900 I200 I700 I300
0-100 mV
V008 V808 V108 V608 V908 V208 V708 V308 V408 V508 I008 I608 I908 I208 I708 I308
0-200 mV
V001 V801 V101 V601 V901 V201 V701 V301 V401 V501 I001 I601 I901 I201 I701 I301
0-250 mV
V004 V804 V104 V604 V904 V204 V704 V304 V404 V504 I004 I604 I904 I204 I704 I304
0-300 mV
V00C V80C V10C V60C V90C V20C V70C V30C V40C V50C I00C I60C I90C I20C I70C I30C
0-400 mV
V009 V809 V109 V609 V909 V209 V709 V309 V409 V509 I009 I609 I909 I209 I709 I309
Input
0
5
1
6
4
2
9
7
3
8
4
C
0
8
E
2
A
6
3
F
B
7 5
9
D
1
Volt/Curr
Select
I V
4
C
0
8
E
2
A
6
3
F
B
7 5
9
D
1
A
B
C
4059G
4
C
0
8
E
2
A
6
3
F
B
7 5
9
D
1
Excitation
Offset Range
E
D
Output
Excitation
Fine Adjust
api-usa.com
1220 American Way Libertyville, IL 60048
Phone:
800-942-0315
Fax: 800-949-7502
A
BSOLUTE
P
ROCESS
I
NSTRUMENTS
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 lead and 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
