IDEC SE4D Type 4 Hand - Manual (Page 10)

9
Functional Descriptions
3-1-2 Floating Blanking Function
This function is set in each SE4D series.
If the number of the blocked beam channels is less than the set number of the beam channels, the
control output (OSSD 1 / 2) of SE4D series is not turned “OFF.”
This function is useful when an obstacle moves within the sensing area.
The factory setting of this function is “ineffective.”
The following items can be set.
Set number of beam channels
● Selectable among 0 (the floating blanking function is ineffective), 1, 2 or 3.
Ineffective setting of both end beam channel
● “Effective / ineffective” of the floating blanking function for the both end beam channels can be
selected.
• SET (Effective) : The floating blanking function becomes ineffective for the both end beam
channels. In case either end of the beam channel is blocked, the control
output (OSSD 1 / 2) of SE4D series is turned “OFF” regardless of the set
number of the beam channels.
• CLR (Ineffective) : The floating blanking function becomes effective for all beam channels
including both end beam channels.
Non-serial beam channel setting
• SET (Effective) : Even if the beam channels are blocked discontinuously in the set beam
channels, the control output (OSSD 1 / 2) of SE4D series is turned “ON.”
(Discontinuous mode)
• CLR (Ineffective) : When the beam channels are blocked discontinuously even in the set beam
channels, the control output (OSSD 1 / 2) of SE4D series is turned “OFF.”
(Continuous mode)
[For use in Europe (EU) (as EN 999)] (Also applicable to ISO 13855)
(For intrusion direction perpendicular to the sensing area)
<In case that the minimum sensing object is ø40mm or less>
● Equation S = K × T + C
S : Safety distance (mm)
Minimum required distance between the sensing area surface and the dangerous parts of
the machine.
K : Intrusion velocity of operator’s body or object (mm/sec.)
Taken as 2,000 (mm/sec.) for calculation
T : Response time of total equipment (sec.)
T = T
m
+ T
SE4D
T
m
: Maximum halting time of machine (sec.)
T
SE4D
: Response time of SE4D series (sec.)
C : Additional distance calculated from the size of the minimum sensing object of the SE4D
series (mm)
However, the value of C cannot be under 0.
C = 8 × (d - 14)
d: Diameter of the minimum sensing object (mm)
● When using the floating blanking function, the size of the minimum sensing object
becomes larger, and the safety distance is longer as well. For the calculation of the
safety distance, refer to the instruction manual enclosed with SE4D series.
● Before designing the system, refer to the relevant laws and standards of the region
where SE4D series is to be used and then install SE4D series.
● The minimum sensing object differs depending on the set number of the beam channels.