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
See wiring diagrams. Observe input polarity.
*Do not make any connections to unused terminals or use them
as wiring junctions for external devices. This may cause perma-
nent damage to the module!
Input
The input range is pre-configured at the factory (at 24°C ±1°C).
The module is compatible with most types of sensors as long as
the waveform produces a minimum 100 mV amplitude change and
a minimum 5 microsecond pulse width.
Refer to the sensor manufacturer's data sheet to determine
proper wiring and supply voltage compatibility. A 15 VDC supply
is available to power the sensor if required.
The 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 kWto
500 Wresistor.
NPN sensors use an external resistor across terminals 9 and 10
if required.
PNP sensors use an external resistor across terminals 9 and 11
if required.
Input Sensitivity Adjustment
A 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 alarm trips.
When fully clockwise (maximum sensitivity), the input threshold
is typically ±25 mV.
In the fully counterclockwise position (minimum sensitivity), the
input threshold is typically ±2.5 volts.
Alarm Types
Note that the deadband is symmetrical about the setpoint; relay
trip and reset points will both change if either the setpoint or
deadband are changed.
High Alarm (default, H, or HH): The alarm relay changes state
when the input signal exceeds the deadband trip point. The relay
resets when the input signal drops below the deadband reset
point. For a high alarm, the trip point is above the reset point.
Low Alarm (L or LL): The alarm relay changes state when the input
signal goes below the deadband trip point. The relay resets when
the input signal exceeds the deadband reset point. For a low alarm
the trip point is below the reset point.
HT: Latching alarm with push button reset
HP: Latching alarm with power-off reset. Module power must be
turned off to reset alarms
R: Reverse-acting alarms. Relay coils energized in an alarm con-
dition. No alarm condition with module power off.
Relay Output Terminals
See wiring diagrams below right for connections. APD modules do
not provide power to the relay contacts. Inductive loads (motors,
solenoids, contactors, etc.) will greatly shorten relay contact life
unless an appropriate RC snubber is installed.
The APD 1700 operates two sets of relays in unison with a single
setpoint. The dual SPDT contact sets are in a Form C configuration.
The APD 1720 operates two sets of relays independently, each
with its own setpoint. The dual SPDT contact sets are in a Form
C configuration.
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 con-
sistency 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 enclo-
sure 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.
Setpoint and Deadband Adjustments
Relay operation is factory configured. See the model/serial num-
ber label for relay configurations.
The Setpoint potentiometer allows the operator to adjust the level
at which the alarm is activated. This control is adjustable from 0
to 100% of the input range.
The Deadband potentiometer allows the alarm trip and reset
window to be adjusted symmetrically about the setpoint from 1 to
100% of the span. This allows the operator to fine tune the point
at which the alarm trips and resets. The deadband is typically
used to prevent chattering of the relays or false trips when the
process signal is unstable or changes rapidly.
To calibrate the alarm section, set the deadband control to the
minimum (counterclockwise). The deadband will be 1.0% of input
span in this case.
Set the signal source to the desired trip point.
Adjust the setpoint control to the point at which the relay changes
state from a non-alarm to an alarm condition.
Turn the deadband potentiometer clockwise for a larger amount
of deadband. The deadband is symmetrical about the setpoint;
both transition points will change as deadband is increased.
Relay set and reset points will both change if the setpoint or
deadband are changed. Alternately set the setpoint and deadband
until the desired trip and rest points are set.
Output Test Function
When the front test button is depressed it will drive the relays to
their opposite state. A customer-supplied switch connected to
terminals 4 and 8 can also be used to toggle the relays. When
released, the relays will return to their prior states.
This can be used as a diagnostic aid during initial start-up or
troubleshooting, or as a manual over-ride function. The Test but-
ton also resets the relays on models with the HT option.
Operation
The 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 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 bicolor alarm LED provides a visual indication of the alarm
status. In all configurations, a green LED indicates a non-alarm
condition and a red LED indicates an alarm condition.
In the normal mode of operation, the relay coil is energized in a
non-alarm condition and de-energized in an alarm condition. This
will create an alarm condition if the module loses power. For a
normal acting, non-latching configuration, the alarm will activate
when the input signal exceeds the setpoint (HI alarm) or falls
below the setpoint (LO alarm), then will automatically reset when
the alarm condition no longer exists.
For a reverse acting alarm, the relay coil is de-energized in a non-
alarm condition and energized in an alarm condition. The alarm
activates when the input signal exceeds the setpoint (HI alarm)
or falls below the setpoint (LO alarm), then automatically resets
when the alarm condition no longer exists.
For models with the latching relay option, it will be necessary to
push the Test button or remove power from the module to reset
the alarm, depending on the type of latching option. The alarm will
only reset if the alarm condition no longer exists.
Installation and Setup APD 1700, APD 1720
Module Power
AC or DC +
AC or DC –
1413 15 16
Cu 60/75°C
conductors
14 AWG
max.
Test Input
APD 1700
Frequency Input to
Single Alarm Trip
Loop
Tracker
Deadband
Setpoint
Alarm
Test
APD 1720
Frequency Input to
Dual Alarm Trip
Input
Loop
Tracker
Deadband 1
Setpoint 1
Alarm 1
Deadband 2
Setpoint 2
Alarm 2
–
2 Wire
109 11 12
Signal
Two wire self-generating
9 Signal (+)
11 Common (–)
15 kWtypical
2 Wire
+15
VDC
109 11 12
Sig.
–
Two wire powered
9 Signal
11 Power (+15 VDC)
Some sensors may require
a bleed resistor.
Three wire NPN
9 Signal: Black or White
10 Power (+15VDC):Brown or Red
11 Common: (–) Blue or Black
Load resistor may be required.
–
NPN
+15
VDC
109 11 12
Signal
Three wire PNP
9 Signal: Black or White
10 Power (+15VDC): Brown or Red
11 Common (–) Blue or Black
Load resistor may be required.
–
PNP
+15
VDC
109 11 12
Signal
Relay Wiring
APD 1700
NO C NC
21 3 4
65 7 8
NO C NC
Customer-
Supplied
Remote
Test Switch
Relay Wiring
APD 1720
RLY 1
RLY 2
NO C NC
21 3 4
65 7 8
NO C NC
Customer-
Supplied
Remote
Test Switch
api-usa.com
1220 American Way Libertyville, IL 60048
Phone: 800-942-0315 Fax: 800-949-7502
AABSOLUTEBSOLUTE PPROCESSROCESS IINSTRUMENTSNSTRUMENTS
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 is 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
* Do not make connections to unused terminals!
1 2 3 4
5 6 7 8
9 10 11 12
13 14 15 16
Input
Relay 1
Power
Relay 2
4 & 8 Relay Test4 & 8 Relay Test Wire terminal torque
0.5Nm to 0.6Nm
(4.4 to 5.3 in-lbs)
To maintain full isola-
tion avoid combining
power supplies in
common with input,
output, or unit power.
* Do not make
connections to
unused terminals!
