Eurotherm AP1280, AP1290 Data Sheet

Action PAK

®

AP1280 & AP1290

Thermocouple Input,

Field Configurable Limit Alarms

AP1280 (Single Trip, DPDT, 5A)

AP1290 (Single/Dual Trip, 2 SPDT, 5A)

 Field Configurable Input Ranges for E, J, K, R, S and

T Type Thermocouples

 Exclusive “Dynamic Deadband” Prevents False Trips
 Burnout Detection

Description

Action Pak models AP1280 and AP1290 limit alarms offer wide
ranging inputs and flexible setpoint capability. They accept six
popular thermocouple types with inputs ranging from -270°C (­454°F) to 1760°C (3200°F). The AP1280 provides a single-setpoint
alarm while the AP1290 provides two independent setpoint
alarms. The AP1280 and AP1290 also include 0.25%-50% adjust­able deadbands and selectable 120/240VAC power.

Diagnostic LED

Models AP1280 and AP1290 are equipped with a dual function
diagnostic LED. The green center LED indicates line power and input
signal status. Active line power is indicated by an illuminated LED.
If the center LED is off, check line power and the wiring connection.
If the input signal is above 100% full scale, the LED will flash at
approximately 8Hz. Below 0%, the flash rate is approximately 4Hz.

Provides Relay Contact Closures

at a Preset Temperature Input Level

 Setpoints Programmable HI or LO
 Selectable Failsafe/Latching Operation
 Selectable 120/240VAC Input Power

(9 to 30 VDC Available)

Dynamic Deadband

The input must remain beyond the setpoint for 100 milliseconds,
uninterrupted, to qualify as a valid trip condition. Likewise, the
input must fall outside the deadband and remain there for 100
milliseconds to return the alarm to an untripped condition. This
effectively results in a “dynamic deadband” - based on time -in
addition to the normal deadband.

Options

U Urethane coating of internal circuitry for protection

from corrosive atmospheres.

P Top mounted, ten-turn dial(s) for setpoint adjustment.

C620 Factory calibration of input range, set points and output

relays. Not available with option P.

Output Selection

The two models of thermocouple limit alarms reflect two styles of
output and setpoint selection:

AP1280 Single Trip (DPDT, 5A)
AP1290 Single/Dual Trip (2 SPDT, 5A)

Setpoints are top accessed multi-turn potentiometers (or option
"P" provides top mounted ten-turn dials).

Operation

The field configurable AP1280 and AP1290 limit alarm setpoints
can be configured for HI, LO, latching or fail-safe trip operation.
Non-latching HI and LO setpoints have respective HI and LO
deadbands. In a tripped condition, the setpoint is exceeded and
the appropriate red LED is lit. The trip will reset only when the
process falls below the HI deadband or rises above the LO
deadband (see figure 1). To reset a latched setpoint the signal
must be in the safe region and the line power must be turned off
for at least 5 seconds. For proper deadband operation, the HI
setpoint must always be set above the LO setpoint.

In failsafe operation, the relay is ener
below a HI setpoint or above a LO setpoint (opposite for non­failsafe). In the failsafe mode, a power failure results in an alarm
condition.

gized when the process is

Configuration

The factory presets for AP1280 and AP1290 are as follows:

AP1280

Input J-type J-type

0-360°C 0-360°C
Burn Out Positive Positive
Output Single, DPDT Dual, SPDT
Trip HI A: HI, B: LO
Latching No No
Failsafe Yes No
Deadband 0.25% A/B: 0.25%
Power 120VAC 120VAC

Refer to Figure 5 for switch locations.

For other I/O ranges, remove the four base screws and case to
access the configuration switches.

Replace the cover before applying power.

AP1290

Figure 1: Limit alarm operation and effect of deadband.

Input

1. Using Table 1, configure positions 1 through 3 of SW1 and 1
through 5 of SW2 for the desired input range. Round desired
maximum/minimum input values to the next highest range (e.g.,
0-300°C = 0-350°C).

2. Choose the desired upscale/downscale thermocouple burnout
detection by setting position 6 of SW2. See Figure 5.

Output

1. Configure positions 4 through 8 of SW1 for the desired alarm
functions. See Figure 6.

Table 1: AP1280-1290 Input Ranges

Power

1. Configure the AC jumpers for either 120 or 240 VAC operation.
See Figure 4.

Calibration

Note: To maximize thermal stability, final calibration should be
performed in the operating installation, allowing approximately 1­2 hours for warmup and thermal equilibrium of the system.

Setpoint: Set deadband at its minimum (factory default - fully
CCW) before adjusting the setpoint. With the appropriate input
applied, adjust setpoint until the relay trips. For HI trip calibration,
start with the setpoint above the desired trip. For LO trip
calibration, start below the desired trip.

Deadband: Set deadband to its minimum (factory default - fully
CCW). Set setpoint to desired trip. Adjust input until relay trips.
Readjust deadband to 50% (fully CW). Set input to desired
deadband position. Slowly adjust deadband until relay untrips.

Note that Custom Calibration (option C620) is available from the
factory (settings MUST be within specifications):

a) Input Type (see table)

b) Setpoint A trip point and reset point

c) Setpoint B trip point and reset point

d) Latching (ON/OFF)

e) Failsafe (ON/OFF)

Note that if a deadband entry is not specified, the default entry will
be used.

Relay Protection and EMI Suppression

When switching inductive loads, maximum relay life and transient
EMI suppression is achieved using external protection (see Figures
2 & 3). Place all protection devices directly across the load and
minimize lead lengths. For AC inductive loads, place a properly­rated MOV across the load in parallel with a series RC snubber. Use
a 0.01 to 0.1mF pulse film capacitor (foil polypropylene recom­mended) of sufficient voltage, and a 47ohm, 1/2W carbon resistor.
For DC inductive loads, place a diode across the load (PRV > DC
supply, 1N4006 recommended) with (+) to cathode and (-) to
anode (the RC snubber is an optional enhancement).

Figure 2: DC Inductive Loads

Figure 3: AC Inductive Loads

Figure 4: 120/240 VAC Selection

ON = Closed

Figure 5: AP1290 Factory Calibration Type "J" 0-360°C

Dual HI/LO, Non-Latching, Non-Failsafe

Mounting

All Action Paks feature plug-in installation. Models AP1280 and AP1290 use
an 11-pin base, either molded socket (M011) or DIN rail socket (MD11).

Dimensions

Dimensions are in millimeters (inches)

1

2

Range

See Table 1

"A" Hi Trip

"A" Low TripOnOff

"B" Hi Trip

"B" Low TripOnOff

3

45

*

78

6

*

Single Trip (A)

Dual Trip TripOnOff

Non-Failsafe

FailsafeOnOff

Latching

Non-LatchingOnOff

Figure 6: Mode Selection; Dual Trip/A: HI, B: LO,

Non-Latching, Non-Failsafe

*AP1290-2000 only

Mark II

M011(Track/Surface)

MD11 (DIN Rail)

Specifications

r

Inputs:

Ranges: See Table 1
Impedance: >1 M Ohms
Input Bias Current (burnout detect):

<1.5 microamp
Overvoltage: ±10V differential
Common Mode (Input to Ground):

600VAC or 1000VDC, max

LED Indications:

Input Range (Green)

>100% input: 8Hz flash

<0% input: 4Hz flash
Setpoint (Red):
Tripped: Solid red
One LED for each setpoint

Limit Differential (Deadband):

0.25% to 50% of span

Response Time:

Dynamic Deadband:

Relay status will change when

proper setpoint/process condition

exists uninterrupted for 100msec
Normal Mode (analog filtering):

<250msec, (10-90%)

Setpoint:

Effectivity: Setpoints are adjustable over
100% of input span

Repeatability (Constant Temp):

±0.2% for inputs > 0°C
±0.3% for inputs < 0°C

Stability:

Line Voltage: ±0.01%/%, max
Temperature: ±0.05% of full scale/°C, max.

Common Mode Rejection:

DC to 60Hz: 120dB

Isolation:

1000V DC between contacts, input and
power

ESD Susceptibility:

Meets IEC 801-2, Level 2 (4KV)

Humidity:

Operating: 15 to 95% (@45°C)
Soak: 90% for 24 hours (@65°C)

Temperature Range:

Operating: 0 to 60°C (32 to 140°F)
Storage: -15 to 70°C (5 to 158°F)

Power:

Consumption: 2W typical, 5W max
Standard: Selectable 120/240VAC (±10%,

50-60Hz)
Optional: 9 to 30VDC Inverter-Isolated

Relay Contacts:

AP1280: DPDT (2 Form C)
AP1290: 1 SPDT (1 Form C) per setpoint
Current Rating (resistive)

120VAC: 5A; 240VAC: 2A; 28VDC: 5A
Material: Silver-Cadmium Oxide
Electrical Life: 105 operations at rated load
Note: External relay contact protection is

required for use with inductive loads.
See relay protection.

7

Mechanical Life: 10

operations

Latch Reset Time:

5 seconds (with power removed)

Weight:

AP1280 0.72lbs
AP1290 0.64lbs

Agency Approvals:

CSA certified per standard C22.2,
No. 0-M1982, (File No. LR42272-8,9)

UL recognized per standard UL 508,
(File No. E99775)

Ordering Information

Specify:

1. Model: AP1280, AP1290

2. Options: U, P (see text)

3. Line Power (see specs.)(All power supplies are transformer-isolated
from the internal circuitry.)

4. C620 Custom Calibration? (see Options)

Accessories:

M801-0000 Retaining Spring
M011-A 11 pin Track Mount Socket
M004-0000 4 ft Long Channel Track
MD11-0000 11 pin DIN Mount Socket

Printed on recycled pape

Action Instruments

Pin Connections

Chessell

1 AC Power (Hot)
2 No Connection
3 AC Power (Neu)
4 Input (+)
5 Input (-)
6 (A) N.O.
7 (A) C
8 (A) N.C.

9 (B) N.O.
10 (B) C
11 (B) N.C.

Key:

N.O. = Normally Open
C = Common
N.C. = Normally Closed
DC Power: Pin 1 = (+)

Pin 3 = (-)

*

Contacts are in the “normal” state

when the relay is de-energized.

Eurotherm