3.3
Basic versions
3TK2810-1 speed monitor
The speed monitor is the main component of safety-related speed monitoring and is necessary
in every application. The terminals and the RJ45 interface are used for the outputs, and for
supplying the device with power and signals. The device is parameterized using the keys and the
display. The LEDs and the display show operating statuses, error messages and diagnostics data.
The device can be configured using the display and the keys on the front panel or via the RJ45
connection and appropriate connecting cable (see section "Accessories (Page 29)") using the
copy function.
The speed can be detected by the following measuring sensors:
• Two NPN or PNP proximity switches connected to inputs E1 and E2. The proximity switches
are supplied with 24 V DC from the speed monitor.
For device variants with NAMUR sensors, these are connected to terminals U1 and U2.
The supply of 8.2 V DC is provided via terminals U1 and U2.
• Encoders (sin/cos, TTL, HTL) connected via cable adapters (available as accessories) to the
RJ45 interface. The encoder is not supplied with power by the speed monitor. Absence of
feedback must be observed.
When selecting the encoders it must be ensured that the signal tracks A, B and their inverted
tracks are present.
• A combination of encoder and proximity switch (or in the case of NAMUR sensor version).
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")
A
A
B
B
180°
90°
90°
360°
Figure 3-1
Example of TTL/HTL level signal characteristics
A combination of encoder and NPN or PNP proximity switch / Namur sensor is also possible.
Product description
3.3 Basic versions
3TK2810-1 safety-related speed monitor
24
Equipment Manual, 05/2020, NEB926246402000/RS-AE/007
