Operation Manual
Safe2+ / Safe4
©
CEDES
Safety & Automation AG / June 2008
www.cedes.com 13
5.3.3. C connector cap
The receiver will be connected by a normal C con-
nector cap M12/5-pole connection cable to the T
connection of the emitter. The T connector A
(=Safety Relay) has a connection to the power sup-
ply and the OSSD output of the light curtain. The
test input is short-circuited.
+2
4
VD
C
0 V
D
C
O
SSD 1
O
SSD 2
GND
(br
o
w
n
)
(bl
ue)
(bl
a
ck
)
(w
h
ite
)
(gr
e
y)
5.3.4. Test input to emitter
Normally the test input at the emitter is installed with
a short circuit jumper to activate the emitter. If an
external test is desired, a contact can be connected
to the test input).
The following points have to be considered:
•
In case of operation in the modus "self moni-
toring" both OSSD outputs have to be con-
nected separately to the safety switching of
the machine.
Only with Safe2+:
•
In case of connecting an external test it could
be that, depending on the test type, only one
OSSD output (OSSD1 or OSSD2) has to be
considered.
The timing of test input is as follows (Figure 19):
Time
Value in ms
Response time on test signal
t
1
≤
t
R
+ 15
Time to test
t
2
>
t
1
Restart time after test
t
3
≤
800
Test input
OSSD 1 / OSSD 2
t
2
t
3
t
1
open
short circuited
Figure 19: Test timing diagram
t
R
means the response time of the respective
Safe2+ or Safe4 type (see product label).
Internal test
Description
Value
Continuous test current
I
10 mA
Peak test current
I
P
100
mA
Time of peak test current
t
P
20
µs
Internal test
Emitter
Test LED
Emitter
Short circuited (closed) Active
Green
Open Inactive
Red
5.3.5. Power supply
Safe 2+ and Safe4 are devices of electrical safety
level III (extra low voltage). 24 VDC ± 20 % has to
be supplied by a power supply that complies with
IEC / EN 60204 and IEC / EN 60742. Such a power
supply meets the electrical safety requirements and
maintains the minimum power of 18 VDC during 20
ms even in the event of voltage dips
5.3.6. Bringing into operation
After the power supply has been applied to the
Safe2+ or Safe4 and the automatic power-up test is
successfully completed (power up test time < 3 s)
the green LED on the receiver and emitter will light
on. The system is now ready to operate.
The automatic power-up test will only be successful,
if the emitter and receiver are properly aligned, cor-
rectly connected and the protective field is not inter-
rupted.
Any intrusion of an object into the protective field will
switch the OSSD off within the specified response
time and the LED at the receiver toggles from green
to red.
5.3.7. Outputs
The two redundant Output Signal Switching De-
vices (OSSD) are fully monitored. Any short circuits
are detected. The maximum load is 0.4 A, higher
currents are limited through short circuit protection.
B=
Receiver
C=
Emitter
A=
Safety Relay
A
B
Tx
Rx
C
A=
Safety Relay
A=
Safety Relay
OSSD 2
+ 24 VDC
OSSD 1
0 VDC
GND
