Ogden ETR-3 Instruction Manual

MANUAL NO. 33

ETR-3 FM SUB-PANEL MOUNT

HI-LIMIT CONTROL

INSTRUCTION
MANUAL

The ETR-3 Series is designed for industrial and com­mercial applications which require high temperature
protection. These controls feature a latching, manually
resettable relay output which de-energizes whenever
the sensed temperature exceeds the set point tempera­ture. It can also be configured as an on-off temperature
control.

SPECIFICATIONS

Power Input:

120VAC ±15%, 50/60Hz, 3VA max.
standard (240VAC and other AC/DC voltages
optional).

Control Output: SPDT Relay rated 3.8 (1.5) Amps

Res. and 1.5 (.8) Amps Pilot Duty 120 (240)VAC.
100,000 cycles. Optional DC output to drive SSR.

Control Mode: Latching with Manual Reset or power off.
Reset Function: Integral reset switch standard;

terminals available for optional remote reset switch.

Set Point Adjustment: Local SP dial adjustment.
Compensation (TC only): Automatic cold junction

compensation.

Control Stability: Typically less than ±5µV/°F ambient

and 0.1% of SPAN/% rated line voltage.

Set Point Accuracy: ±3% of FS maximum at 78°F

(25°C) and rated line voltage.

Sensor Break Protection:

Contacts 4 and 5 open for thermocouple or RTD

break.

Ambient Operating Temperature:

32 - 140°F (0 - 60°C).

MECHANICAL

Enclosure Material: Noryl, Black color.
Field Terminations: Screw Terminals with wire

clamping plates and touch safe shield.

Mounting: 35mm DIN rail or surface mounting.

AGENCY APPROVALS: UL 873 and CUL per CSA

C22.2 No.24 File #E179225; FM 3545.

Switc

t

DIMENSIONS:

MOUNTING

The ETR-3 can be surface mounted or mounted on a DIN
rail. The ETR-3 must be located inside a suitable control
enclosure. It can be mounted to any suitable flat surface
using two #8 screws (not supplied). To install simply
position the top set of rear clips over the top of the DIN

rail. Then swing the bottom of the controller toward the
rail applying pressure until the lower clips snap on to the
bottom of the DIN rail. To remove apply pressure to the
top of the controller’s base and move the bottom of the
controller toward you. Then lift the top pf the controller
off the upper DIN rail.

3-5/16"

(84mm)

3/8"

(9.5mm)

Limit Controller

234

1

N.C.

L2

N.O.

Relay

Output

L1

AC

+ –

DC

Power

Input

2-1/2"

(63.5mm)

200

150

°F

RESET

56789

+ –

COM

TC or

RTD

Sensor

350

300

Optional N.O.

Remote Reset

2-9/16"

(65mm)

3"

(76.2mm)

Integral Rese

Button

h

Set point

adjust

2-1/2"

(63.5mm)

Panel mounting foot
with clearance holes

for #8 screw

(2 places)

35mm

DIN rail

mounting clips

WIRING

Carefully follow the terminal diagram pictured on the con­troller’s housing and shown above. The power and load
wiring should be 18 AWG or larger size. Be sure to observe
that the ratings for voltage and current are not exceeded. All
local and national electrical codes must be followed. Use only
the sensor type as indicated on the control and maintain cor­rect polarity. THE RED THERMOCOUPLE LEAD ALWAYS
CONNECTS TO THE NEGATIVE (–) TERMINAL.

To reduce electrical noise, the thermocouple wire must be iso­lated from any power or heater wiring. Shielded thermocou­ple wire may be necessary in high noise environments or
when lead lengths exceed 10 feet. Thermocouples are tip
sensitive and must be in good mechanical contact with the
load.

OPERATION

The set point temperature is adjustable by turning the integral
dial. If the set point is exceeded, contacts 4 and 5 will open.
It will remain in this state until the temperature drops below
the set point and

the controller is manually reset. Manual
reset can be accomplished by one of the following means: a)
Press the “reset button”. b) Amomentary switch closure
between terminals 8 and 9. c) Interrupt power to the control.

CAUTION

This controller must be mounted in an enclosure suitable for
protection against normally expected operation environments
and to minimize unauthorized tampering with the limit set­tings. This control is not to be used in hazardous locations as
defined in Articles 500 and 505 of the National Electric Code.

MAINTENANCE

No specific maintenance is required. However, it is recom­mended that all wiring be checked periodically for loose con­nections and damaged wires. Disconnect power to the panel
before any maintenance is performed. Check wires and
tighten connections.

TROUBLE SHOOTING

RISK OF ELECTRIC SHOCK -

Dangerous and potentially
fatal voltages are present when working on this equipment.
Before installation or beginning any troubleshooting proce­dures, the electric power to this equipment must be discon­nected and locked out as described by OSHA Standards.
Units suspected of being faulty must be removed and
returned to Ogden for inspection and/or repair. They contain
no user serviceable components.

Experience has proven that many control problems are not
caused by a defective instrument.

Some of the common causes of failure are broken sensors,
open fuses and poor wire connections.

If these points have been checked and the control still does
not function, it is suggested that the instrument be returned
for inspection.

Use adequate packing materials to prevent damage in
shipment.

Return Control To:

OGDEN MANUFACTURING CO.

ATTN: Repair Department

64 West Seegers Road, Arlington Heights, IL 60005

[phone] • Fax: [phone]
www.ogdenmfg.com

©Ogden Manufacturing Co. 2001 PRINTED IN U.S.A. 02/2001

OGDEN and ETR are Registered

Trademarks of

Ogden Manufacturing Co.

MARCA REGISTRADA

Specifications subject to change without notice.

TYPICAL WIRING DIAGRAM

Control

Fuse

H

5A

120V

Control

Power

N

Primary

Temperature

Control

120VAC

T/C

or

RTD

NC

C

Coil

NO

Optional Alarm

or Warning

Lamp

ETR-3

Limit

234

1

200

150

NC

NO

C

+

56789

350

300

°F

–

Optional N.O.

Remote Reset

Switch

T/C or RTD

Coil

Heater Power

1 or 3 Phase

Heater

Fuses

Primary

Control

Contactor

Heater(s)

ETR-3

Limit

Contactor