KEYENCE SL-C Series - Manual (Page 44)

Chapter 3 Wiring
3-8
3
English ENGLISH
• Waveforms of control outputs
The SL-C performs a self-diagnosis test for the output circuit when all beam axes are clear of any
obstruction and the OSSD is in an ON-state. This self-diagnosis function periodically turns OFF the
OSSD output.
The OSSD output is monitored by the SL-C and, if the OFF state signal is fed back, the SL-C deter-
mines that the output circuit operates normally.
On the other hand, if the OFF state signal is not fed back, the SL-C determines that an error has oc-
curred in the output circuit or wiring and goes into a lockout condition.
For this reason, all the other devices used to receive the SL-C OSSD output must be of the type that
does not respond to this periodic off state.
SL-C
OSSD1
OSSD2
A
ON
OFF
ON
OFF
B
Approx. 5.3ms
A:Approx. 5 µs B:Approx. 20 µs A and B: the checking
pulse for self-diagnosis
Approx. 4.7ms Approx. 4.7ms
A A B A B
A B A A B A
(When connected to a non-capacitive load.)
3-9 Beam Axis Adjustment
This section explains how to adjust the beam axes after power-on.
Adjustment procedures:
To assure accurate beam axis adjustment, make sure that all obstacles in the SL-C detection zone are
cleared and the transmitter and receiver surfaces are clean.
1. Adjust the beam axis of both the transmitter and the receiver.
(a) Place the transmitter and receiver facing each other, and adjust their angles so that all bar LEDs
turn green.
(b) If a bar LED flashes green, the amount of receiving light is insufficient. Re-adjust the angle of
the transmitter and/or receiver until the bar LED turns green.
2. Find the range in which the bar LED remains green and fix the angle to the center of the range.
3. After completing the beam axis adjustment, re-tighten the angle holding screws on the SL-C mount-
ing brackets.
- The recommended tightening torque for standard mounting brackets is 0.7 N•m.
- The recommended tightening torque for E-to-E mounting brackets is 1.2 N•m. (When the protect
bar is in use, 0.9 N•m)
If all bar LEDs do not turn on green after completing the receiver angle adjustment, check if the
transmitter and receiver are mounted parallel to each other, the transmitter and receiver are
mounted at same level to each other, or the transmitter and receiver are mounted on the same
plane.