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ENGLISH
cated 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 diagram must be pro-
vided on site by the purchaser.
If a unit is to be operated with this control unit without explo-
sion protection or dry running 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 diagram. In case of
wrong phase sequence ("Drehfeld falsch" (Wrong rotating eld)
indicator is lit, the two phases must be interchanged (not ap-
plicable for alternating current).
Connection of the pumps
Only pumps which are allocated to this control unit in the cata-
logue 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 dia-
gram.
The strands of the pump cable marked 30/32 (thermal motor
contacts) must be connected to terminals 30/32 of the PCB.
NOTICE! Core 31 potentially present in older pumps is not nee-
ded for this control unit; the free end can be nipped off and
insulated (230 V!).
For single units (AD...) set the relay to the nominal current of
the pump. The reset function of the overcurrent relay must be
set to “Hand”. If necessary, use a screwdriver to turn the reset
button clockwise, as far as it will go, to the “H” position.
For duplex units (BD...) set the motor protection switches to
the nominal current of the pumps.
If the direction of rotation is correct, the starting jerk of the
pump will be counter to the direction 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.
CAUTION!
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 instal-
lation drawing). Connect the white air hose (base load) to the
lower pressure sensor and the blue air hose (peak load/alarm)
to the upper pressure switch. The air hoses must not be longer
than 20 m.
NOTICE! The hose connections to the sensor and pressure
switch must be absolutely airtight. Use a permanently elastic
sealant to seal these connections. Due to the risk of leakage,
existing hoses must not be extended, but must be re-laid in
one piece.
NOTICE! Both air hoses to the control unit must be routed
with an uphill gradient and be frost-resistant over their entire
length. Otherwise, condensation may occur which may result
in a shift in the switching point and even in failure of the con-
trol!
Connect the white hose for "Base load" to pressure switch B1
and the blue hose for "Alarm/peak load" to pressure switch B2
of the control unit.
GL= Base load ON, SL= AD: alarm, BD: 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.
WARNING!
In accordance with the explosion protection laws and regula-
tions (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 these time ranges, the exact time
is set with the "Nachlaufzeit" (shut-off delay) trimmer so that
the unit is switched off after both pressure sensors have sur-
faced completely, but before the pumps draw air (snorkel) or
the dry running protection is triggered.
NOTICE! If the pressure sensors do not surface, the switching
point may shift and the chamber may overll as a result.
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