3UG4622-1AW30 Datasheet, PDF (105/114 Pages) List of Unclassifed Manufacturers – Monitoring and Control Devices

3TK28 Safety Relays
With relay enabling circuits
■ Overview
The SIRIUS safety pilot guides you quickly to the right device
Type
1-channel 2-channel Crossover Category
connection connection protection acc. to EN 954-1
B1 2 3 4
Basic units
3TK28 21
✔
✔
✔
✔ ✔ ✔ ✔ --
3TK28 22
--
✔
✔
✔✔✔✔✔
3TK28 23
--
✔
✔
✔✔✔✔✔
3TK28 24
✔
✔
✔
✔ ✔ ✔ ✔ --
3TK28 25
✔
✔
✔
✔✔✔✔✔
3TK28 27
✔
✔
✔
✔ ✔ ✔ ✔ ¹⁾
3TK28 28
✔
✔
✔
✔ ✔ ✔ ✔ ¹⁾
EMER- Protective
GENCY- door
STOP
Enabling
contacts
✔
✔
✔²⁾
✔
✔
--
✔
✔
✔
✔
✔
--
✔
✔
3 NO
2 NO
2 NO
2 NO
3 NO
2 NO +
2 NO,
delayed
2 NO +
2 NO,
delayed
Signaling Autostart Monitored
contacts
start
1 NC ✔
--
--
✔
--
--
--
✔
--
✔
–
2 NC ✔
✔
1 NC --
✔
1 NC ✔
--
Expansion devices (category as for basic unit)
3TK28 30
--
--
●
● ● ● ● ● --
--
4 NO
--
--
--
Press control devices (acc. to EN 574)
3TK28 34
--
✔
✔
✔ ✔ ✔ ✔ ✔ --
--
2 NO + 2 NC --
--
--
3TK28 35
--
--
--
✔ ✔ ✔ ✔ ✔ --
--
3 NO + 1 NC --
--
--
✔ = available
-- = not available
● = corresponds to basic unit
1) Only possible for instantaneous enabling contacts.
2) The ON button is not monitored.
■ Design
The 3TK28 21 to 28, 3TK28 30 and 3TK28 34 safety relays
operate with internal contactor relays with positively-driven
contacts. The contacts of the controls comply with the
requirement for positively driven operation laid down in
ZH 1/457, Edition 2, 1978. NO and NC contacts are not allowed
to be closed at the same time.
In a redundant circuit, operation of the internal controls is
monitored. If a safety relay fails, it will always switch to the de-
energized and consequently safe state. The fault is detected
and the safety relay can no longer be switched on. The use of
NO and NC contacts for the same function satisfies the demand
for diversity.
This product series is characterized by its space-saving width
(22.5 mm or 45 mm). The usual BIA, BG and SUVA approvals
and test certificates have been awarded.
Enabling contacts (FK)
Safety related operation must be performed by safe output
contacts, known as enabling contacts. Enabling contacts are
always NO contacts and switch without delay.
Signaling contacts (MK)
NC contacts are used as signaling contacts but they are not
permitted to perform functions with relevance for safety. An
enabling contact can also be used as a signaling contact. A
signaling contact cannot, however, be used as an enabling
contact.
Delayed enabling contacts
Machine drives that overrun for a long time must be externally
braked in the event of danger. For this purpose, the power
supply for electrical braking can be maintained (Stop
Category 1 according to EN 60204-1).
The basic units have off-delay enabling contacts in addition to
instantaneous enabling contacts. Time delays of between 0.5
and 30 s are available with the different versions. A 3RP19 02
sealable covering cap (see Catalog LV 1, Selection and ordering
data, Accessories) can be fitted to protect against unauthorized
adjustment of the set delay time.
Expansion units
If the enabling contacts of the basic unit are inadequate,
expansion units can be used. An expansion unit has 4 enabling
contacts.
Expansion units are not allowed to be operated separately in
safety-related switching circuits; they must be combined with a
basic unit. One enabling contact of the basic unit is required for
connecting an expansion unit. The category of a control system
with expansion unit corresponds to that of the basic unit.
Installation
The equipment is designed for snap-on mounting on a 35 mm
standard mounting rail to EN 50022. Screw fixing is also possible
for the devices by means of 2 additional 3RP19 03 push-in lugs.
Siemens LV 1 T · 2006 _7/105