Jung Pumpen AD 12 ExME, Instruction Manual

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55
English
Before carrying out any work: Dis -
connect the pump and the control
unit from the mains by unscrewing
and removing the pre-fuses and take action to
ensure that no one else can reconnect them to
the power supply.
When using the control, the respective national
laws and regulations as well as local regulations
on protection against explosion must be ob -
served, such as European standards EN 60079-
0, EN 60079-1, EN 60079-14, EN 60079-17 and
EN 1127-1.
ATTENTION!
The control unit must not be in -
stalled in a hazardous area or in the collecting
chamber!
The control unit must only be installed in well
ventilated rooms above the backup level,
where it can be easily inspected at any time.
Attach the housing upright using at least four
screws.
ATTENTION! If the control unit is installed in
a column which is located out of doors, there
is a danger that condensation may occur. This
could result in malfunctions or in complete
failure of the control unit. Please observe the
information given on correct installation of the
column.
A - Empty housing; B - Seal; C - Dry white sand
Note: Connections dashed in the circuit dia -
gram must be provided on site by the pur -
chaser.
If a unit is to be operated with this control
unit without explosion protection or dry run -
ning protection then switch B5 or B3 must be
bridged:
In the case of AD ...bridge terminals 18/20,
In the case of BD ...bridge terminals 20/23.
Mains connection
Insert separate pre-fuses. Safety fuses must
be used. For nominal value please refer to the
Technical data.
Connect mains cable according to circuit dia -
gram. In case of wrong phase sequence ("Dreh -
feld falsch" (Wrong rotating field )indicator is
lit, the two phases must be interchanged (not
applicable for alternating current).
Connection of the pumps
Only pumps which are allocated to this control
unit in the catalogue may be connected.
The pump cable strands that are marked must
be connected to the terminals of the control
unit as shown in the circuit diagram.
The strands of the pump cable marked 30/32
(thermal motor contacts) must be connected
to terminals 30/32 of the PCB.
ATTENTION! Core 31 potentially present in
older pumps is not needed for this control unit;
the free end can be nipped off and insulated
(230 V!).
For single units (AS...) set the Y-delta switching
time at terminal 1 to 2 seconds.
For single units (AD...) set the relay to the
nominal current of the pump (for AS 610 ExM
nominal current x 0.58).
For duplex units (BD...) set the motor protec -
tion switches to the nominal current of the
pumps.
If the direction of rotation is correct, the star -
ting jerk of the pump will be counter to the di -
rection of the arrow on the motor housing. If
the direction of rotation is wrong, two phases
of the pump cable must be interchanged on
the control unit.
The start-up jolt can be very strong.
Pressure sensors
The switch-on levels are determined by the
mounting heights of the pressure sensors in
the collecting chamber (see installation draw -
ing). Connect the white air pipe (base load) to
the lower pressure sensor and the blue air pipe
(peak load/alarm) to the upper pressure switch.
The air pipes must not be longer than 20 m.
ATTENTION!
Due to the risk of leakage, exist -
ing pipes must not be extended, but must be
re-laid in one piece.
ATTENTION! Both air pipes to the control unit
must be routed with an uphill gradient and be
frost-resistant over their entire length. Other -
wise, condensation may occur which may re -
sult in a shift in the switching point and even in
failure of the control!
Connect the white pipe for "Base load" to pres -
sure switch B1 and the blue pipe for "Alarm/
peak load" to pressure switch B2 of the control
unit.
Base load ON, alarm ON /peak load ON,
N= end of shut-off delay,
T= OFF dry running protection
Adjustment of the shut-off delay
The shut-off delay is the time between pressure
switch B1 switching off and the pump actually
shutting down.
In accordance with the explosion
protection laws and regulations (e.g.
EN 1127-1), explosion-protected
pumps should never be allowed to run dry or to
operate in “snore” mode. The pump must switch
off when the water level sinks to the upper
edge of the pump housing, at the very latest.
Two time ranges can be selected with a micro-
switch on the printed circuit board. Within the -
se time ranges, the exact time is set with the
"Nachlaufzeit" (shut-off delay) trimmer so that
the unit is switched off after both pressure sen -
sors have surfaced completely, but before the
pumps draw air (snorkel) or the dry running
protection is triggered.
ATTENTION! If the pressure sensors do not
surface, the switching point may shift and the
chamber may overfill as a result.
A correct shut-off delay can be set only after
one or more test runs with the unit! The final
run-time of the pump is revealed only when
the wastewater pressure line has been comple -
tely filled up with wastewater.