SIEMENS
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Siemens IC 10 · 2017
Relays
SIRIUS 3RS14, 3RS15 temperature monitoring relays for IO-Link
Relays, digitally adjustable for 1 sensor
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Overview
SIRIUS 3RS1440 digital monitoring relay for 1 sensor
The 3RS14 and 3RS15 temperature monitoring relays for IO-Link
are used to measure temperatures in solid, liquid and gas me-
dia. The temperature is calculated using a sensor in the medium,
evaluated by the device and monitored for overshooting or un-
dershooting a working range (window function). The digital tem-
perature monitoring relays have two separately adjustable limit
values, are non-volatile and can be operated as desired using
the open- or closed-circuit principle.
The devices differ in terms of the number of temperature sensors
which can be evaluated. The 3RS1440 and 3RS1540 for IO-Link
temperature monitoring relays can be digitally adjusted for one
sensor and represent an alternative to temperature controllers in
the low-end range (two-point or three-point control).
The devices with two-point control can, for example, be used as
a thermostat. The devices with three-point control can, for exam-
ple, independently switch between heating and cooling.
The 3RS1441 temperature monitoring relays for IO-Link can be
digitally adjusted to evaluate up to three resistance sensors at
one time. The devices were designed specifically for monitoring
motor windings and positions.
The temperature monitoring relays are powered through the
control supply voltages IO-Link (L+) and ground (L-) or via an
external 24 V DC power supply.
Monitoring
When the temperature has reached the set limit value
1, the
output relay K1 changes its switching state after the configured
time
t
has expired (output relay K2 responds to
2 in the same
way). The delay time can be adjusted.
The output relays return immediately to their original state once
the temperature reaches the respective hysteresis value.
When the temperature has reached the upper limit value
1, the
output relay K1 changes its switching state after the configured
time
t
has expired. The output relay returns immediately to its
original state once the temperature reaches the respective
hysteresis value.
The K2 output relay responds in the same manner to the lower
limit value of
2. Both thresholds
1 and
2 can be parameter-
ized for overshooting or undershooting. This makes it possible to
use a limit value for issuing an alarm signal to announce that a
limit value is about to be overshot or undershot.
Note:
The "Temperature monitoring mode" parameter can be used to
set the desired type of monitoring (monitoring for overshooting
or undershooting or range monitoring).
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Benefits
•
Very simple operation without complicated menu selections
•
Two- or three-point control can be parameterized quickly
•
All versions with removable terminals
•
All versions with screw or spring-type terminals
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Application
The temperature monitoring relays can be used in almost any
application in which temperature overshoot or undershoot is not
permitted, e.g. in the monitoring of set temperature limits and the
output of alarm messages for:
•
Plant and environment protection
•
Temperature limits for process variables e.g. in the packaging
industry or electroplating
•
Temperature limits for district heating plants
•
Exhaust temperature monitoring
•
Controlling equipment and machines such as heating, climate
and ventilation systems, solar collectors, heat pumps or warm
water supplies
•
Motor, bearing and gear oil monitoring
•
Monitoring of coolants
© Siemens AG 2016