Omron K8AB-TH User manual

Advanced Industrial Automation
K8AB-TH
Protect your heating application
Temperature monitoring relay.
The K8AB-TH is a temperature-monitoring relay that embodies both
temperature-alarm functionality and simple ON/OFF temperature
control. The unit is designed specifically for monitoring abnormal
temperatures to prevent excessive temperature increases and
to protect equipment. It comes in a slim housing with a width
of just 22.5 mm suitable for DIN-rail or direct panel mounting.
Settings are selected by DIP switches, making the K8AB-TH easy
to configure. The alarm threshold is set using rotary switches
on the front, allowing the alarm point to be easily checked at
a later time. The unit features multiple inputs with support for
both thermocouples and Pt100 sensors. For the alarm output,
a change-over relay is provided and, in contrast to many other,
comparable, monitoring relays, the K8AB-TH also embodies an
output latch function with (front button) latch reset, SV protection
and the choice of fail-safe/non-fail-safe relay operation.
Power indicator
Output latch reset button
(hold for SV protection)
Latch Reset (remote input)
Alarm Threshold (SV) setting switches
Alarm indicator
Alarm Output (change over relay)
Power supply
Sensor input
°C/°F marker
SW4 Temperature Unit (°C/°F)
SW5-SW8 Input type selector
SW3 Operation (Fail-safe/Non Fail-safe)
SW2 Output latch (On/Off)
SW1 Alarm mode (High/Low)
Easy to set up, field-configurable DIP switch
for multi-input and unit selection.
DIP switches

If a temperature sensor is damaged or the SSR
is short circuited in a furnace, the controller has
no means of stopping rises in temperature.
An internal alarm can help, but there is still some
risk if the controller fails. This risk is eliminated
by the built-in redundancy of the K8AB-TH alarm
unit which can automatically switch off the power
to the furnace.
Temperature rises due to heat dissipation from
SSRs within a cabinet can be too high for efficient
operation. Simple ON/OFF control with the
K8AB-TH can protect against overheating without
the necessity and expense of running the fans
continuously.
LEA_K8AB-TH_01_EN_INT
Although we strive for perfection, Omron Europe BV and/or its subsidiary and affiliated companies do not warrant or make any representations regarding the correctness or completeness of the information described in this document. We reserve the right to make any changes at any time without prior notice.
Power supply
Alarm setting
Input (current temperature)
Alarm (red) indicator
Non-fail safe,
Alarm (relay) output
Fail safe,
Alarm (relay) output
Power supply
Alarm setting
Input (current temperature)
Alarm (red) indicator
Latch reset (see note)
Non-fail safe,
Alarm (relay) output
Fail safe,
Alarm (relay) output
Note: The output latch is reset using the reset button on the front or the external input terminal.
Hysteresis 2°C Hysteresis 2°C
Output Latch Enabled Output Latch Disabled
Output latch function with (front button) latch reset,
SV protection and the choice of fail-safe/non-fail-safe relay operation.
Benefits of K8AB-TH
temperature-monitoring relay:
• Flexibility: simple and intelligent
features for temperature alarm.
• Easy to set up, field-configurable DIP
switch for multi-input and unit selection.
• Space-saving design, compact and slim
(22.5 mm wide) DIN-rail & direct panel
mounting.
• Only 4 application-specific models,
high- and low-temperature range,
24 V or 100-240 V.
• Change-over type output relay, with or
without latching and front button reset.
• Self protecting against power or unit
failure thanks to selectable relay
fail-safe mode.
• Clear status indication;
one LED for power and SV protection,
one LED for alarm and unit condition.
For control
Temperature guard non latching Temperature ‘policeman’ latching
K8AB-TH models
Model Supply voltage Setting accuracy Temperature setting range Input type
K8AB-TH11S 100 to 240 VAC 1°C/°F 0 to 399°C/°F Thermocouple (K, J, T, E) / PT100
K8AB-TH11S 24 VAC/VDC
K8AB-TH12S 100 to 240 VAC 10°C/°F 0 to 1700°C/0 to 3200°F Thermocouple (K, J, T, E, B, R, S, PLII)
K8AB-TH12S 24 VAC/VDC
OMRON EUROPE B.V. Wegalaan 67-69, NL-2132 JD, Hoofddorp, The Netherlands. Tel: [phone] Fax: [phone] www.omron-industrial.com
Austria
Tel: [phone]
www.omron.at
Belgium
Tel: [phone]
www.omron.be
Czech Republic
Tel: [phone]
www.omron.cz
Denmark
Tel: [phone]
www.omron.dk
Finland
Tel: [phone]
www.omron.fi
France
Tel: [phone]
www.omron.fr
Germany
Tel: [phone]
www.omron.de
Hungary
Tel: [phone]
www.omron.hu
Italy
Tel: [phone]
www.omron.it
Middle East & Africa
Tel: [phone]
www.omron-industrial.com
Netherlands
Tel: [phone]
www.omron.nl
Norway
Tel: [phone]
www.omron.no
Poland
Tel: [phone]
www.omron.pl
Portugal
Tel: [phone]
www.omron.pt
Russia
Tel: [phone]
www.omron.ru
Spain
Tel: [phone]
www.omron.es
Sweden
Tel: [phone]
www.omron.se
Switzerland
Tel: [phone]
www.omron.ch
Turkey
Tel: [phone]
www.omron.com.tr
United Kingdom
Tel: [phone]
www.omron.co.uk