BUSKRO BK7IB-2, User Manual

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Chapter 4 Electrical System Troubleshooting Page 4-6
3. JP1:
JP1 1 – 2: Jam signal
is ignored by the
board, but still
passed on to the
control computer.
2 – 3: Jam signal
is ignored by the
board, and not
passed on to the
control computer.
Determines how the board handles a JAM input and
the effect of S1-4.
For some applications it is desirable to suppress the
STOP signal from the JAM sensor, but to still report the
condition to the control computer. In this case,
selection 1-2 should be used.
If no control computer is connected, either position may
be used, with 1-2 preferred.
Caution – connecting 2 to 3 will cause a short circuit
condition on the Jam input when the input is disabled
(i.e., S1-4 is closed). However, diode D42 would
prevent a positive input voltage from seeing this short
circuit.
Note: If a Stop input is disabled using S1, then the corresponding setting of S2 no
longer matters, since no output is generated in either case.
In “normal” operation, enabling the S2-2 will produce a lock-up condition between
the 2 machines. S2-2 should therefore always be disabled (= Off). The function
was only included on this channel for special installations. Usually all other
positions of S2 are set to the “enabled” position, to make sure that no machine
can start while a downstream machine has a problem. In the case of S2-2, no
harm will be done if a downstream machine is started while an upstream machine
has a problem.
4.2.1 Troubleshooting the Base Control Board and Peripheral Circuitry
Six LEDs are included on the board to help in troubleshooting the equipment:
“12V OK”. This green LED indicates that 12 VDC is applied to the board. Note that this
indicator is ahead of the fuse (F1) and will still be lit, even if the fuse is burned out. As
long as the LED is lit, the technician will know that the 12 VDC supply in the base is
operating properly.
“START I/P”. This amber LED indicates that the board is receiving a Start signal (either
from upstream or downstream equipment, or from the front panel START switch).
“STOP I/P”. This red LED indicates that the board is receiving a STOP signal on any one
of the 6 Stop inputs. The LED is also duplicated in the front panel STOP switch. As long
Buskro Ltd. BK7IB Inline Base