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Beko BEKOMAT 3 E 25 Installation Und Betriebsanleitung Seite 13

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The condensate level and the discharge times are determined
with the aid of two capacitive probes (two-position measure-
ment) arranged in a vertical line along a sensor tube and
connected to a waiting circuit.
Information on the respective states of the upper and lower
probe is obtained by waveform comparison. When both probes
are covered by condensate, the discharge procedure is started
- after a delay of approx. 2 seconds - and the alarm/monitoring
circuit is activated.
As soon as the solenoid valve opens, i.e. when the condensate
discharge starts, the electronic system determines the pres-
sure-dependent time required until the lower probe will again
be free of condensate.
This figure serves as a basis for calculating the necessary open-
ing time of the solenoid valve up to final discharge without loss
of compressed air. At the end of this period, the BEKOMAT will
be completely empty; the discharge procedure is then stopped,
and the alarm/monitoring circuit is deactivated.
In the event of no condensate discharge, e.g., if the conden-
sate discharge pipe is blocked or the pressure drops below
the required minimum the alarm/monitoring circuit will regulate
the further sequence of functions (see below "Alarm/monitoring
control", 1. and 2.").
Alarm monitoring control
The BEKOMAT electronic system ensures permanent monitor-
ing of the operating states of the condensate drain. Any mal-
functions will be signalled via the potential-free alarm contact.
The control operates in a fail-safe mode.
Consequently, an alarm signal can still be relayed via the
potential-free contact, if the power supply to the BEKOMAT
is interrupted. The circuit diagrams on page 14 show the de-
energised state of the BEKOMAT with the potential-free alarm
contact 3.0-3.1 closed (alarm mode).
When voltage is applied, the alarm relay picks up and terminals
3.1-3.2 of the potential-free contact are closed (normal operating
state). In the case of a malfunction, the alarm relay drops out
and terminals 3.0-3.1 are connected (alarm mode).
1. The situation may arise where the discharge procedure
is started, but the lower probe remains covered, so that
the required opening time of the solenoid valve cannot be
calculated. In this case, the discharge procedure is inter-
rupted after approx. 2.5 sec., and is only restarted when
the upper probe is covered again.
2. Under certain conditions mentioned above, the lower and
upper probe of the BEKOMAT may remain per-manently
covered. In this case, the discharge proce-dure is interrupted
after approx. 2.5 seconds and restarted after a delay of
approx. 2 seconds. This procedure is then repeated until
the alarm signal is triggered.
Electrical function
The alarm signal occurs after approx. 60 seconds, and the
alarm circuit takes over the subsequent control of the solenoid
valve.
In the alarm mode, the solenoid valve is first closed, and the
alarm relay drops out, while the potential-free changeover
contact goes into off-position. The alarm signal is maintained,
and the alarm circuit actuates the solenoid valve approx. every
4 minutes for a period of approx. 7.5 seconds. The alarm mode
LED continues to flash. This switching function is repeated
until the condensate drain is again operating under normal
conditions.
The solenoid valve can be actuated by means of the test switch
at any time; the valve will stay open as long as the switch is
being pressed. During testing, the red LED flashes and, after
pressing the test switch for about one minute, an alarm signal
is given via the potential-free contact. After releasing the test
switch, the condensate drain will revert to normal operation.
The circuitry of the BEKOMAT is designed in such a way that
- after relevant changes of the PCB components and correct
adjustments, which must be done at our works - it can also
function with direct voltage. In addition to mounting the neces-
sary components on the printed circuit board, d.c. operation
requires fitting of a special solenoid coil.
LED power: (green)
operating state 'power supply' (LED on = voltage is applied).
LED valve: (yellow)
indication of actuated solenoid valve (LED on = solenoid valve
open).
LED alarm: (red)
alarm and test state indication with flashing frequency of 2 - 3
times per second.
13

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Diese Anleitung auch für:

Bekomat 3 e 63Bekomat 6 e 25

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