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Product description
2.3 Basic versions
Functional principle of the 3TK2810-1 speed monitor
The 3TK2810-1 speed monitor is used for safety-related detection or monitoring of a
standstill (output 13/14), and additionally for monitoring a set speed window (lower and
upper speed limit) in setup or automatic mode (output 23/24).
To detect the standstill or the speed of the motor, the speed (frequency) is measured using
two NPN or PNP proximity switches (design version with NAMUR sensors) or using
encoders (sin/cos, TTL, HTL) with two signal tracks and their inverted tracks. (See Fig.
"Example of HTL level signal characteristics")
Figure 2-1
A combination of encoder and NPN or PNP proximity switch / Namur sensor is also possible.
Evaluation is carried out in two diversely redundant microcontrollers using the applied pulse
trains. The measured frequency is compared here with the specified speed limit for standstill,
and with the limits for setup or automatic mode (depending on the operating mode). The
speed limits for the individual operating modes can be adjusted by the user to optimally
adapt the speed monitor to the most diverse applications and motor types. If a motor
standstill is detected, NO contact paths 13/14 are connected. If the speed is within the
specified limits of setup or automatic mode, NO contact paths 23/24 are connected.
Power-up/self-test
Once the power supply has been applied, the device performs a self-test. During the self-test
phase, all LEDs briefly light up (lamp test) and all the pixels on the display are energized for
approximately 2 seconds.
After power-up, the LEDs light up according to the device status.
16
180°
360°
90°
90°
Example of HTL level signal characteristics
A
A
B
B
3TK2810-1 safety-related speed monitor
System Manual, 01/2011, 926246402000 DS 02
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