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GuardShield™ Safe 4 Safety Light Curtain User Manual
Troubleshooting Guide
The light curtain carries out an internal self-test after startup. If an error
occurs, an appropriate signal combination is indicated by the LEDs of
the transmitter or the receiver.
Assure that all power to the machine, and
ATTENTION
safety system is disconnected during
electrical installation.
System Status Indicators
Transmitter
Power on
POWER
(orange)
Normal operation
OK
(green)
Test input
TEST
(red)
Optical
(IR light)
Figure 19: LED indicators
Possible errors and operation status are indicated with the LED
indicators on the transmitter and receiver.
The following combinations are relevant:
Status
No power supply (external)
Test input closed (external)
Test input open (external)
Controller error (internal)
Protective field error (internal)
Table 1: Transmitter
16
Receiver
Power on
POWER
(orange)
Output active
(green)
Output inactive
(red)
Optical
(IR light)
LEDs
Orange
Green
Red
(Power)
(ok)
(Test)
off
off
off
on
on
off
on
off
on
flashing
off
on
flashing
off
on
Original instructions
Status
No power supply (external)
No sufficient power (external)
OSSD on (on-load operation, protective
field not interrupted, normal)
OSSD off (off-load operation, protective
field interrupted or insufficient
alignment of the system)
OSSD error (external, short circuit
between OSSD 1 and OSSD 2, towards
0 V or 24V DC)
Controller error (internal)
Protective field error (internal)
Table 2: Receiver
External error: An external interface error can be resolved by correcting the
installation, due to
1. Receiver: short circuit of both OSSDs, of OSSD to U
to GND
2. Transmitter: Test input open
3. No power or power supply too low
4. Inadequate adjustment of transmitter and receiver
Internal error (orange Power LED is irregularly flashing): Exchange
Component
Normal operation
Transmitter
Receiver
Test input closed
OSSD on
closed
OSSD off
Test input open
OSSD off
LED
Green
Red
Orange
(Protective field
(Protective field
(Power)
not interrupted)
interrupted)
off
off
off
on
off
off
on
on
on
flashing
off
on
all 3s
off
flashing
short time
irregular
off
on
flashing
flashing
off
flashing
or of OSSD
sp,
Operation status
Protective field free
Protective field interrupted
Test active
R
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