Watlow Electric 97 User Manual

SERIES 97

An Over-temperature
Limit Controller
With User Defined
Messages

Watlow’s SERIES 97 is a microprocessor-based controller
with a single input, second auxiliary input and four
outputs. Input one is used to measure temperature from a
sensor.Input two can be utilized as a remote reset switch
or a hardware lockout switch. With up to four outputs, the
controller is versatile in handling applications that require
a high/low limit, alarms, retransmit and communications.
The control is so user friendly that it can be set up to
display safety and limit messages created by the end
user to meet the exact application need.

The SERIES 97 limit controller is added to thermal
applications to limit over-temperature conditions.The
SERIES 97 limit controller provides safety assurance
against instances where a high temperature runaway
condition could occur from a shorted input sensor or an
output device that could fail in a closed position.

The SERIES 97 is recommended for any application
where thermal runaway could result in large product
scrap costs, affect operator safety, cause damage to
equipment or create a fire hazard.

The SERIES 97 is manufactured by ISO 9001 registered
Watlow Winona and reliably backed up by a three-year
warranty.

1241 Bundy Boulevard
Winona, Minnesota 55987-5580 USA
Phone: [phone]
Fax: [phone]
Internet: www.watlow.com
e-mail: [e-mail]

WIN-97-1203

Registered Company

Winona, Minnesota USA

ISO 9001ISO 9001

Features and Benefits

Programmable messages

• Controller can be set up to display user

programmed limit message

NEMA 4X (IP65)

• Water and corrosion resistant; front panel

can be washed down

Microprocessor-based

• Accurate set point settings and quick

output response

Second auxiliary input

• Remote reset capability

Four outputs

• Handles high/low limit, alarms, communication

and retransmit requirements

Software and hardware lockouts

• High security

© 2003 Watlow Electric Manufacturing Company Printed in the USA on Recycled Paper, 15 Percent Postconsumer Waste

Specifications

Controller

• Microprocessor-based

• Universal input 1, auxiliary input 2, 4 outputs

• Input sample period; Single input 10Hz (100 msec),
dual input 5Hz (200 msec) digital filter adjustable

• Display update; 2Hz (500 msec), time filter adjustable

• Input/Output/Communication isolation

• Displayed in °C, °F

Operator Interface

• Dual 4-digit LED displays: upper 10.2 mm (0.4 in.),
lower 6.2 mm (0.244 in.)

• Advance, Up Arrow, Down Arrow, Reset tactile keys

Standard Conditions For Specifications

•Ambient temperature 77°F (25°C) ±3°C, rated line
voltage, 50 to 60Hz, 0 to 90 percent RH
non-condensing,
15 minute warm-up

Universal Input 1

Thermocouple

•Type J, K, T, N, C (W5), E, PTII, D (W3), B, R, S
thermocouple types

• >20MΩ input impedance

• Maximum 20Ω source resistance

• 30mA open detection bias

RTD

•2- or 3-wire platinum, 100Ω

• JIS and DIN curves

•Whole or tenth degree indication

• 150µA nominal RTD excitation current

Input 2

Event Input

• Contact or voltage

• 20KΩ input impedance

•Voltage input: event high state 3 to 36VÎ(dc),
event low state 0 to 2VÎ(dc)

• Resistance/contact input: event high state > 23kΩ,
event low state 0 to 2kΩ

Output Types
Open Collector/Switched DC

• Open collector configuration:
Maximum voltage 42VÎ(dc)
Maximum current 200mA
Maximum “on” resistance 1.1Ω
Maximum offstate leakage current 100µA

• Switched dc configuration:
Switched dc supply voltage 22 to 28VÎ(dc)
dc supply current limited to 30mA

Solid State Relay

• Optically isolated

• Zero cross switched

• Without contact suppression

• Minimum load current 0.5mA rms

Solid State Relay (cont.)

•Maximum current 0.5A rms at 20 to 280VÅ(ac)

•Maximum offstate leakage current 10µA rms

•For resistive loads only, must use RC suppression for
inductive loads

Electromechanical Relay

•Form C contact configuration

• Minimum load current 10mA @ 5VÎ(dc)

• Rated resistive and inductive loads: 2A @ 250VÅ(ac)
or 30VÎ(dc) maximum

• Electrical life 100,000 cycles at rated current

•For resistive loads only, must use RC suppression for
inductive loads

Retransmit

• Range selectable: 0-20mA, 4-20mA, 0-5VÎ(dc),
1-5VÎ(dc), 0-10VÎ(dc)

•0 to 10VÎ(dc) voltage output into a 1,000Ω minimum
load resistance

•0 to 20mA current output into an 800Ω maximum load
resistance

• Resolution:
Vdc ranges = 2.5mV nominal
mA ranges = 5µA nominal

• Calibration accuracy:
Vdc ranges = ±15mV
mA ranges = ±30µA

•Temperature stability 100ppm/°C

Communications

• EIA/TIA-485, EIA/TIA-232

• Opto-isolated

• Modbus

TM

RTU protocol

• 1200, 2400, 4800, 9600, 19200 baud rates

• 32 maximum units can be connected (With additional
485 repeater hardware, up to 247 units may be
connected)

Accuracy

• Input ranges
Type J: 0 to 750°C or 32 to 1382°F
Type K: -200 to 1250°C or -328 to 2282°F
Type T: -200 to 350°C or -328 to 662°F
Type N: 0 to 1250°C or 32 to 2282°F
Type E: -200 to 900°C or -328 to 1470°F
Type C(W5): 0 to 2315°C or 32 to 4200°F
Type D(W3): 0 to 2315°C or 32 to 4200°F
Type PTII: 0 to 1393°C or 32 to 2540°F
Type R: 0 to 1450°C or 32 to 2642°F
Type S: 0 to 1450°C or 32 to 2642°F
Type B: 870 to 1700°C or 1598 to 3092°F
DIN: -200 to 800°C or -328 to 1472°F
JIS: -200 to 630°C or -328 to 1166°F

ModbusTMis a trademark of AEG Schneider Automation.