System Description; Teach-In" Function For Actuators - SICK T 4000 Compact Betriebsanleitung

Operating Instructions

System description

The non contact safety interlock T 4000 consists of
three components:
- Coded actuator
- Read head
- Evaluation unit
In the compact version T 4000-2 DRNAC, the
evaluation unit and the read head are integrated in a
single standard housing (to EN 60 947-5-2).
Each actuator supplied features an electronic code
that is unique to the system used. The actuator code
cannot be reprogrammed.
The safety interlock with integrated evaluation unit
and read head is attached to the stationary part of
the safety guard.
When the door is closed, the actuator attached to
the moving part of the safety guard is moved towards
the read head housed in the safety interlock. When
the switch-on distance is reached, power is supplied
to the actuator via the inductive read head and the
data can be transferred.
The read-in bit pattern is compared with the code
stored in the evaluation unit. If the two sets of data
match, the safety outputs (semiconductor outputs)
are released and the door signal output
(semiconductor output) is set to HIGH.
Due to dynamic scanning by the actuator and the
diversity of the safety electronics in conjunction with
two monitored safety outputs, the evaluation unit
enters the safe state when any detectable error
occurs.
When the safety guard is opened, the safety outputs
disconnect the safety circuit and the door signal output
(OUT) is switched to LOW. The status of the safety
outputs is monitored internally by means of two
microprocessors.
If an internal error occurs in the evaluation unit, the
safety circuit is disconnected and the red OUT/
ERROR LED lights up.
Note: The dwell time of an actuator inside and outsi-
de the operating range must be at least 0.5 seconds,
otherwise the evaluation unit could enter the error
state such that the red OUT/ERROR LED lights up.
Disconnecting the supply voltage resets the evalua-
tion unit to the operating state.
8 009 212/O591/04-05-04 • © SICK AG • Industrial Safety Systems • Germany • All rights reserved
Safety sensor T 4000 Compact

"Teach-in" function for actuators

The actuator must be assigned to the evaluation unit
with the teach-in function before the system forms a
functional unit.
During the "teach-in" operation, the safety outputs
and the door signal output OUT are set to LOW, i.e.
the system is in the safe state.
Teach-In function for first actuator (condition as
delivered):
1. Apply the operating voltage to the evaluation unit
- Fast blinking (approx. 4 Hz) of the green LED
2. Move the actuator towards the read head
(note distance < S )
ao
- Teach-In operation commences; slow blinking
(approx. 1 Hz) of the green LED
3. Teach-In operation complete (after 60 seconds)
- Green LED goes out
4. The operating voltage applied to the evaluation unit
must then be disconnected for a minimum of
10 seconds to activate the actuator code taught in
the evaluation unit.
Teach-In function for a new actuator:
1. Apply the operating voltage to the evaluation unit
2. Move the new actuator towards the read head (note
distance < S )
ao
- Teach-In operation commences; green LED
blinks (approx. 1 Hz)
3. Teach-In operation complete (after 60 seconds)
- Green LED goes out, new code is saved and old
code is deactivated.
4. The operating voltage on the evaluation unit must
then be disconnected for a minimum of 10 seconds
to activate the actuator code taught in the evaluation
unit.
Note:
It is not possible to teach the same actuator
on the same evaluation unit more than once.
The number of valid Teach-In operations on
one evaluation unit is limited to a maximum of
8.
The evaluation unit can be operated only with
the last actuator taught.
A Teach-In operation is invalid if:
- the Teach-In operation is aborted before the
green LED go out
- The supply voltage has been disconnected
during the Teach-In operation
Important:
The system automatically reverts to Teach-In mode
even after the 8th Teach-In operation or if an "old"
actuator is moved against the read head. In both ca-
ses, a Teach-In Operation lasting 60 seconds is in-
itiated, but the last actuator code remains active in
memory (see Status table); no new code is taught.
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