STR100
10460-0703-00
Page
4 / 8
www.ziehl.de
5
Detailed Description
The STR 100 measures the resistance of a Pt 100 RTD. The STR 100 monitors sensor line interruption and
sensor short circuit. A red LED signals sensor failure.
The signal is send to both independent electronic channels and compared with the preset limit. Every
comparator sets a relay. The relay contacts are made in series thus the outputs operate as a single change
over contact. When temperature is below the preset limit and there is no failure in the sensor circuit both relays
K1 and K2 can pick up and contact 11, 14 is closed.
The red LED "Sensor" signals a failure in the sensor circuit and both relays release. Contact 11, 12 is closed
for warning/alarm. The red LED K1 and LED K2 also signal alarm when temperature exceeds the preset limit
and both relays K1 and K2 release. The green LED ON/Ready is not alight and control relay picks up, the
contact at terminal 6,7 is open (break contact, nc). The STR 100 operates now in not changeable safety
mode, the relays are locked. When temperature is app. 10 K below the limit the control relay (contacts 6/7
close) releases and the green LED is alight. The STR 100 now operates in changeable safety mode, the
relays can be reset manually with built-in reset button or with external contact (make contact, no) at terminal
Y1, Y2.
6
Function Chart
7
Important Information
DANGER!
Hazardous voltage!
Will cause death or serious injury. Turn off and lock out all power
supplying this device before working on this device.
Before connecting the device to the mains voltage, make sure that the control
Voltage Us on the type plate corresponds to the mains voltage connected
To the device!
To use the equipment flawless and safe, transport and store properly, install and start professionally and
operate as directed.
Only let persons work with the equipment who are familiar with installation, start and use and who have
appropriate qualification corresponding to their function. They must observe the contents of the instructions
manual, the information which are written on the equipment and the relevant security instructions for the
setting up and the use of electrical units.
R
G
A1/A2
11
12
14
T1/T2
Y1
Y2
LED
K1,K2
21
22
ON/Ready
!
!
LED
Sensor
LED
Shortcircuit