Eurotherm WV128 Data Sheet

WV128-2000 (non-latching)
WV128-2001 (latching)

ULTRA SLIMPAK® II

WV128

DC Powered T/C Input Limit Alarm

Provides Relay Contact Closures at a

Preset Temperature Input Level

 Programmable HI or LO, Failsafe or Non-failsafe
 Improved Accuracy
 Adjustable Deadband
 Bussed Power with Plug-in Power Clips
 Removable Terminals for Easy Service

Description

The Ultra SlimPak II is an exciting new line of isolating signal
conditioners from Action Instruments with greater accuracy and
better stability than virtually any other signal conditioners on the
market today.

The WV128 is a Thermocouple Input Limit Alarm with dual
setpoints and two contact closure outputs. The input type and
alarm functions are field configurable, offering maximum flexibil­ity. There are seven thermocouple types (B, E, J, K, R, S and T) from
which to choose. Alarm setpoints are fully adjustable throughout
the entire range.

The WV128-2000 contains two standard non-latching SPDT relays.
When power is removed, the relays revert to their non-powered
state. The WV128-2001 contains two latching relays. Whatever
position the relays are in when power is removed is where they will
remain when power is re-applied (a reset switch is provided to
reset the relays after the alarm is no longer true). Both models are
configurable as a single or dual setpoint alarm, with HI or LO trips.
The WV128-2000 supports failsafe or non-failsafe operation. In
failsafe operation the relay coil is energized when the process is
below the HI setpoint or above the LO setpoint (opposite for non­failsafe). In the failsafe mode, a power failure results in an alarm
state output.

 Touch Cal for Best Stability and Accuracy
 RoHS Compliant
 LED Trip and Input Indicators
 Optional E-mail Notification of Alarms

Enhanced LED Diagnostics

Other than when executing the pushbutton calibration routine,
the LEDs blink under the following conditions:

RUN (Green):

On when unit is powered.
Flashes at 2Hz when input is under range.
Flashes at 8Hz when input is over range.

SETPOINT A (Red):

On when Setpoint A is tripped.
On when setting Setpoint A.
Flashes while calibrating the input level.

SETPOINT B (Red):

On when Setpoint B is tripped.
On when setting Setpoint B.
On while calibrating the input level.

Operation

Each of the alarm setpoints has a respective HI or LO deadband.
Red LEDs will illuminate indicating an alarm condition. The trip will
reset only when the process falls below the HI deadband or rises
above the LO deadband. (The WV128-2001 requires pressing the
reset switch in order to reset the relays after being tripped.) The
deadband can be left at the minimum level (the factory default)
or can be set to whatever level is desired.

Options

C620 Factory cal of input range, setpoints and output relays.

Figure 1: Limit alarm operation and effect of deadband.

An Under Range condition exists when the signal is lower than the
operational low value minus 6.25% of the operational span. An
Over Range condition exists when the signal is higher than the
operational high value plus 6.25% of the operational span.

Configuring Modules

Unless otherwise specified, the factory presets the Model WV128
as follows:

Input: Type J

Output: Dual, SPDT

Trip: A: HI, B: LO

Failsafe: No

Deadband: A, B: minimum

Remote Cal: No

Calibration

See calibration flwchart in Figure 6. The complete calibration
procedure is contained in the Installation & Calibration Instruc­tions document, which is available on our website
(www.actionio.com). You can also obtain it by telephoning Action
technical support (

Note that Custom Calibration (option C620) is available from the
factory (settings MUST be within the units specifications). For a
C620, specify the following:

1. For other ranges, refer to the SWITCH SETTINGS table (see
Figure 4). Reconfigure switches S1 and S2 for the desired input
type and range.

2. Set position 1 of S1 to ON if a WVC16 will be utilized and remote
calibration capability is desired.

3. Set position 2 and 3 of S1 to ON for a Hi trip setpoint or to OFF
for a Low trip setpoint.

4. Set position 4 of S1 to ON for failsafe operation (e.g. alarm trips
upon power failure) or OFF for non-failsafe operation (-2000 only).

It is also possible to remotely select the setpoints using an Ethernet
connection and the optional WVC16 WebView Communications
Interface module.

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 all 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).

a) Input type.

b) Setpoint A trip point and reset point.

c) Setpoint B trip point and reset point.

d) Failsafe (ON/OFF).

Note that if a deadband entry is not specified, the default setting
of 0.25% will be used.

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c/tK----

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c/tS----

c/tT----

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Figure 2: DC Inductive Loads

Figure 3: AC Inductive Loads

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Figure 4: Switch Settings

ON = Closed

Remote Cal Enable

Remote Cal DisableOnOff

"A" Hi Trip

"A" Low TripOnOff

Default Switch Settings

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3

2

Non-FailsafeOnOff

"B" Hi Trip

"B" Low TripOnOff

------

7

6

Input: Type J T/C

(see Table)

Failsafe

Figure 5: Wiring Connections

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21 ByaleR.moC

31 ByaleR.C.N

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35 AyaleR.C.N

Figure 6: Calibration Flowchart

Specifications

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Inputs:

Thermocouples Supported: B, E, J, K, R, S, T

Ranges:
T/C °
B +75 to 1820 +167 to 3308
E -265 to 1000 -445 to 1832
J -210 to 760 -346 to 1400
K -265 to 1372 -445 to 2502
R -25 to 1760 -13 to 3200
S -25 to 1760 -13 to 3200
T -265 to 390 -445 to 734
Overvoltage: ±10V differential
Common Mode: 1800VDC (Input to Ground)
Limit Differential (deadband): 0.2% to 100% of span. Set by

Pushbutton Adjustment.

Response Time:

Dynamic Deadband: Relay status will change when proper setpoint/
process condition exists for 100mSec.

Normal Mode: <250mSec (analog filtering)

Setpoint:

Effectivity: Setpoints are adjustable (by pushbutton) over 100% of
the selected input span.

Repeatability: ±0.05% of FS, ±1°C (constant temp)

Relay Contacts:

2 SPDT (2 form C) Relays

Current rating (general use):

C °F

1 relay per setpoint

120VAC: 5A; 240VAC: 2A; 28VDC: 5A
Material: Gold flash over silver alloy
Electrical Life: 10

5

operations

Reset Switch:

For unlatching the relay once the process is no longer in the alarm
state. (WV128-2001 only)

Local Range Selection: By DIP switch
Stability: ±100ppm of FS/°C
Common Mode Rejection: 120dB @ DC, >90dB @ 60Hz, or better
Isolation: 1800VDC or peak AC between contacts, input & power.
ESD Susceptibility: Capable of meeting IEC 801-2 level 3 (8kV)
Power: 9 to 30VDC; 1.2W typ., (3.25W max both relays energized)
Host Module Interface: IR link
Wire Terminations: Screw terminations for 12-22 AWG
Size: DIN rail case – refer to Dimensions drawing
Environmental:

Operating Temperature: 0°C to +60°C (32 to 140°F)
Storage Temperature: -25°C to +85°C (-13 to 185°F)
Operating Humidity (non-condensing): 15% to 95% at 45°C
Storge Humidity (non-condensing): 90% at 60°C for 24 hours

Agency Approvals (EMC & Safety):

UL recognized per standard UL508

(File No.E99775)

CE Conformance per EMC directive 2004/108/EC and Low Voltage

directive 2006/95/EC (Input < 75VDC, only).

RoHS Compliant

Ordering Information

Specify:

1. Model:

WV128-2000 (non-latching) or
WV128-2001 (latching)

2. Optional Custom Factory Calibration (specify C620, see required

settings under "Calibration, page 2).

3. Accessories.

Accessories

All WV Series modules will mount on standard TS35 (model MD03)
DIN rail. In addition, the following accessories are available:

WVC16 Communications Interface

MD03 TS35 x 7.5 DIN Rail (2 meters)

WV905 24VDC Power Supply (0.5 Amp)

H910 24VDC Power Supply (1 Amp)
H915 24VDC Power Supply (2.3 Amp)

MB03 End Bracket for MD03

C650 Utility software for WVC16

Printed on recycled pape

Note that detailed installation instructions are available on our website.

Dimensions

Dimensions are in millimeters (inches)

Action Instruments

Chessell

721-0859-00-E 02/09 Copyright© Eurotherm, Inc 2009

Eurotherm