Operation Mode 2, 3, 4, 5: Protective Operation With Muting - DOLD SAFEMASTER BH 5902/01MF2 Mode D'emploi

Operation Mode 2, 3, 4, 5: Protective Operation With Muting

Application e.g. for conveyors
• 1 or 2 light curtains
• Muting of light curtain 1
• 2 or 4 muting sensors with different input sequences
• LC1 with auto or manual start
• LC2 always with manual start
• Override via start button
• Manual start is always necessary after supply voltage ist connected
Muting
Muting means to disable temporarily the protective function of a light curtain.
This function is used to transport material through a light curtain without
stopping the machine. The differentiation between material and persons is
done by additional muting sensors which have to create a certain switching
sequence together with the light curtain when material passes the light
curtain. The muting control starts then the muting cycle for the time the
material is passing the light curtain. It must not be possible that a person
activates the muting sensors in the same switching sequence as the mate-
rial. To realise this function 2 different switching sequences can be chosen
on BH 5902 either with 2 or 4 muting sensors. This makes sure that if a
person passes the light curtain the dangerous movement of the machine is
stopped immediately. The muting cycle is indicated by a muting lamp that
is controlled and monitored by the BH 5902. The maximum muting time
can be set in 10 steps between 10 s and infinite.
If the light curtain is still interrupted after the max. permitted muting time
e.g. by blocked material the contacts K1, K2 open and the muting lamp as
well as the LED run 1 show failure code 4.
Starting by pressing the start button is only possible if the muting lamp is
working and the light curtain to be muted is free of interruption. During the
muting cycle a wrong switching sequence or exceeding the maximum mu-
ting time leads to failure code 4. This failure can only be reset by pressing
the start button. The muting sensors have to be installed in a way, that the
correct sequence cannot be achieved manually or by passing the light
curtain (see IEC/EN 61 491-1)
Possible settings:
0 1
2 LC S1 Auto,
muting 2 sensors
3 LC S1 Manu,
muting 2 sensors
4 LC S1 Auto,
muting 4 sensors
5 LC S1 Manu,
Muting 4 sensors
Override
If the monitored area is blocked by transported material and the outputs K1,
K2 are switched off, this is indicated by fast flashing (approx. 3 Hz) of the
muting lamp. The operator can activate the outputs K1, K2 by pressing the
start button for more than 3 s for a maximum time of 12 s until the muting
sensor are again inactive or the start button is released again.
Example for an override cycle when muting with 2 sensors
unmuted LC2
muted LC1
muting sensor 1
muting sensor 2
safety relay K1/K2
start button
muting lamp
error code 1
t=3 S
: on : flashing
Switch 10:
a = maximum muting time
b = maximum synchronising time
2 3 4 5 6 7 8
override
2
t < 12 S
: fast flashing (3Hz)
In all function diagrams the part "monitored operation" is the phase where
the unit differentiates between men and material.
Using 2 muting sensors
LC
MS1
Machine
LC, muted
Muting sensor 1
Muting sensor 2
Muting lamp
Muting lamp monitoring
30ms t
t < synchronization
Using 4 muting sensors
9
Machine
LC, muted
Muting sensor 1
Muting sensor 2
Muting sensor 3
Muting sensor 4
Muting lamp
Muting lamp monitoring
£
30ms t
t < synchronization
time (b)
M9477
26
MS2
Material
Muting lamp
£
t < muting time (a)
time (b)
LC
MS4 MS3 MS2 MS1
Material
Muting lamp
t < muting time (a)
BH 5902/01MF2 / 26.01.21 en / 296A
Conveyor
£
30ms t
t < synchronization
time (b)
M7962_a
Conveyor
£
30ms t
t < synchronization
tme (b)
M7964_a