Manual Mode; Operating Time In Manual Mode - Krom Schroder BCU 560 Technical Information

Parameters

11 .10 Manual mode

If the Reset/Information button is pressed for 2 s during switch-
on, the BCU reverts to Manual mode. Two dots blink on the
display. The BCU is now operating in Manual mode inde-
pendently of the status of the inputs of the start-up signal
(terminal 1), controlled air flow (terminal 2) and remote reset
(terminal 3). The functions of the safety-relevant inputs such as
controller enable/emergency stop (terminal 46) are retained.
The manual start-up of the BCU can be started in Manual
mode by pressing the Reset/Information button. Each time
the button is pressed again, the BCU moves to the next step
of the program sequence and stops there, for example for
adjusting an actuator or the gas/air mixture.
Actuator IC 20, IC 40 and RBW
Following controller enable (status display 04 ), a connected
actuator can be opened and closed as required. By holding the
button, the actuator is first opened further. The BCU indicates
A
with blinking dots. Once the button has been released,
the actuator stops in the relevant position. Pressing it again
will result in closing the actuator to the position for minimum
capacity. The BCU indicates A with blinking dots. A change
of direction takes place each time the button is released and
pressed again. When the actuator has reached its final posi-
tion, the dots disappear.
BCU 560, BCU 565 · Edition 02.16

11 .10 .1 Operating time in Manual mode

Parameter 67
Parameter 67 determines when Manual mode is terminated.
Parameter 67 = 0: Manual mode is not limited in time.
If this function has been selected, operation of the burner may
be continued manually in the event of failure of the control
system or the bus activation.
Parameter 67 = 1: the BCU will terminate Manual mode 5 min-
utes after the last time the button is pressed. It then moves
abruptly back to the start-up position (standby).
If the unit is switched off or a power failure occurs, Manual
mode on the BCU will be terminated regardless of param-
eter 67.
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