BWS-T2 Series Instructions manual
7
Q Upon application of power, the red ALARM LED lights up and the
START INTERLOCK function will prevent the operation of the output
contacts.
R The active operation mode can be initiated only with a N.O. (normally
open) start switch. After closing the start switch, the INITIAL TEST
function will be activated automatically. The red ALARM LED goes off
and the yellow TEST LED lights up.
S After the start switch is released, and only if no fault is detected, both
N.O. output contacts will switch to the active operation mode.
In this case the yellow TEST LED goes off and the green FREE LED
lights up.
T Thereafter, any interruption of the optical beam(s) will cause the
RESTART INTERLOCK to prevent automatic re-activation and force
the operator to re-initiate with the start switch.
U If a fault is detected, after the start switch is released, the yellow TEST
LED goes off and the red ALARM LED lights up; the output contacts
remain open (preventing machine start up).
V During the active operating mode, the CYCLE TEST can be performed
by means of 2 N.C. contacts: Test 1 and Test 2 (see figure 2).
This procedure is normally used to detect the status of the BWS-T2
periodically.
By opening the Test 1 contact, the CYCLE TEST is started; the output
contacts are OPEN for the duration of the test and will CLOSE after
the test is completed only if the BWS-T2 has detected no fault
.
The test is completed when the Test 2 contact is opened and then
closed.
The CYCLE TEST is such that any short-circuit, open, or component
malfunction will be instantly recognized.
The LED indicators for the CYCLE TEST have the same function as in
the INITIAL TEST.
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