DIAGNOSTICS
The alarm condition is always signalled by
the led of the alarm icon
The alarm signal (referred to the analogue
input) is shown as E1 on the instrument
display for a faulty analogue input error or
for reading values outside the viewing
range.
When the analogue input detects an error
condition:
• the code E1 is displayed
• the regulator is activated as indicated by
the "On1" and "OF1" parameters if pro-
grammed for the duty cycle or:
PLEASE NOTE:
In case of wrong connec-
tion of the 3rd wire (Pt100 sensor) in “AL”
folder it will appear the label “Pt3”.
For few seconds the display will shows
a uncorrect temperature.
INSTALLATION
The instrument is designed for panel
mounting. Make a hole of 29x71 mm,
insert the instrument and fix it using the
brackets provided. Do not mount the
instrument in humid and/or dirty places; it
is suitable for use in ordinary polluted
places. Ventilate the place in proximity to
the instrument colling slits.
ELECTRICAL
WIRING
Attention! Never work on electrical con-
nections when the machine is switched on.
The instrument is equipped with screw ter-
minal boards for connection of electrical
cables with a diameter of 2.5 mm
2
(one
conductor only per terminal for power
connections).
For the capacity of the terminals, see the
label on the instrument.
The relay contacts are voltage free. Do not
exceed the maximum current allowed; in
case of higher loads, use an appropriate
contactor. Make sure the power supply
voltage complies with the one required by
the instrument.
In 12V versions the power supply must be
provided by a security transformer with
the protection of a delayed 250 mA fuse.
Probe cable
(Pt100 model)
, power supply
cables and the TTL serial cables should be
distant from power cables.
(Pt100 model)
Probe can be extended using a regular
bipolar cable (note that the extension of
the probes affects the EMC electromagnet-
ic compatibility of the instrument: pay
extreme attention to wiring).
CONDITIONS OF USE
PERMITTED USE
For safety reasons the instrument must be
installed and used according to the
instruction provided and in particular,
under normal conditions, parts bearing
dangerous voltage levels must not be
accessible.
The device must be adequately protected
from water and dust as per the application
and must also only be accessible via the
use of tools (with the exception of the
frontlet).
The device is ideally suited for use on
household appliances and/or similar refrig-
eration equipment and has been tested
with regard to the aspects concerning
European reference standards on safety. It
is classified as follows:
• according to its manufacture: as an auto-
matic electronic control device to be
incorporated by independent mounting;
• according to its automatic operating fea-
tures: as a 1 B-type operated control type;
• as a Class A device in relation to the cat-
egory and structure of the software
UNPERMITTED USE
Any other use other than that permitted is
de facto prohibited. It should be noted
that the relay contacts provided are of a
practical type and therefore subject to
fault. Any protection devices required by
product standards or dictated by common
sense due to obvious safety reasons should
be applied externally.
LIABILITY AND RESIDUAL
RISKS
Invensys Controls Italy S.r.L. shall not be
liable for any damages deriving from:
- installation/use other than that pre-
scribed and, in particular, that which does
not comply with safety standards anticipat-
ed by regulations and/or those given here-
in;
- use on boards which do not guarantee
adequate protection against electric shock,
water or dust under the conditions of
assembly applied;
- use on boards which allow access to dan-
gerous parts without the use of tools;
- tampering with and/or alteration of the
products;
TECHNICAL DATA
Frontal panel protection: IP65.
Casing: plastic body in resin type
PC+ABS UL94 V-0, inspection window in
polycarbonate, buttons in thermoplastic
resin.
Dimensions: frontal panel 74x32 mm,
depth 59 mm (without wirings).
Installation: on panel, with drilling tem-
plate 71x29 mm (+0.2/–0.1 mm).
Use temperature: –5…55 °C.
Storage temperature.: –30…85 °C.
Use environment humidity: 10…90 % RH
(not condensing).
Storage environment humidity: 10…90% RH
(not condensing).
Viewing range:
• Pt100 model : -150…650°C, with decimal
point, selectable through parameter ndt
• TcJ model -40…750°C*
• TcK model -40…1350°C*
*without decimal point
on 3 digit &
1
/
2
+ mark display.
PLEASE NOTE: viewing is 1/10 °C for
model Pt100 and 1°C for models TcJ/TcK
Serial: TTL for connection to Copy Card.
Analogue input: one PT100 input or TcJ or
TcK depending on model.
Digital outputs: 2 SPST outputs on 8(3)A
1/2 hp 250V
a
, (for relay capabilities see
label on the instrument)
Measuring range: from -150 to 1350.
Accuracy:
• Pt100 model : 0,5% for all scale + 1 digit;
0,2% from -150 to 300°C.
• TcJ model: 0,4% for all scale + 1 digit;
• TcK model 0,5% for all scale + 1 digit;
0,3% from -40 to 800°C.
Resolution:
• Pt100 model: 0,1°C (0,1°F) within 199,9
°C, 1°C (1°F) over
• TcJ/TcK model 1°C (1°F).
Consumption
• model 230V: 3 VA max.
• model 12V: 1,5 VA max.
Power supply: 12 V
a
/
c
±10% or 230V
a
±10% 50/60 Hz.
Warning: check the power supply specified
on the instrument label; for relay and
power supply capacities, contact the Sales
Office).
IC 912 Pt100/TcJ/TcK
2/4
On1
0
0
>0
>0
OF1
0
>0
0
>0
regulator output
OFF
OFF
ON
D.C.
