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8. Malfunctions and troubleshooting
8.2.2 Internal monitoring
The control unit evaluates the signals of the phase/rotary field
monitoring, motor protection switch and motor temperature
sensor regardless of the configuration. In the event of a mal-
function or non-readiness for operation, the pump is switched
off or the switch-on suppressed. In addition, a fault is indica-
ted by the respective display LED and the malfunction relay
switching.
Phase/rotary field monitoring
If L2 and/or L3 fail, the "phase/rotary field" LED is perma-
nently lit, and the "malfunction" relay becomes active. (In this
case the control unit can no longer recognise rotary field
faults.) Since the control unit is supplied by L1, failure of L1
cannot be indicated. If L1 fails, however, the built-in signal
sensor is switched on provided the rechargeable battery is
inserted in the control unit and charged.
In the case of false rotary field (anti-clockwise rotary field) the
"phase/rotary field" LED flashes. The contactor for the motor
output is disabled by the control unit.
Motor protection switch
One auxiliary contact (each) of the motor protection switch is
evaluated. If a motor protection switch has triggered on ac-
count of manual actuation, short-circuit or exceed load, a
malfunction is indicated by the "motor protection switch" LED
(or LED "pump ... MSS/temp" is permanently lit) and the
"malfunction" relay. In addition, the contactor for the motor
output is disabled by the control unit.
Motor temperature
In every motor, there is a temperature sensor which indica-
tes excess temperature to the control unit:
When excess temperature has been reached (approx. 110
°C) this is indicated (flashing) by the "motor temperature"
LED (or "pump ... MSS/temp" LED in the case of a twin sy-
stem) and the "malfunction" relay drops out. In addition, the
contactor for the respective motor output is disabled by the
control unit. When the motor has cooled down again, the
pump is automatically ready for operation as soon as the
temperature sensor indicates this.
8.2.3 "Malfunction" message
SMalfunction messages are sent through:
• Activation of the "malfunction" relay and thus through the
warning device connected to this.
• Display of the type of malfunction by the malfunction LEDs
on individual systems with
– Phase/rotary field
– Motor protection switch
– Motor temperature
– Running time/level
or on twin systems with
– Phase/rotary field
– Pump 2 MSS/temp
– Pump 1 MSS/temp
– Running time/level
The conditions for the malfunction messages are described
in detail in the previous chapters.
8.2.4 "Alarm" message
Alarm messages are sent through:
• Activation of the "alarm" relay and thus through the war-
ning device connected to this.
• The internal signal sensor
Two conditions can lead to an alarm message.
1. An alarm message is issued if the level exceeds the
"alarm" level. The internal acoustic alarm can be switched
off again by pressing the "alarm reset" key. As soon as the
level falls below the "alarm" level, both alarm messages
(signal sensor and relay) are reset.
2. If a replaceable battery (battery) is inserted and charged,
an alarm message is also issued if there is a power failu-
re, i.e. the mains power failure is indicated by an acoustic
signal triggered by the internal signal sensor. The rechar-
geable battery supplies the internal signal sensor for a few
hours depending on the charge state. The internal acou-
stic alarm can be switched off again by pressing the "alarm
reset" key.
8.2.5 What to do when...
... the motor protection switch has triggered.
Remove the transparent housing cover (heed instruc-
tions!) and press the black "START" switch on the motor pro-
tection switch. If the motor protection switch triggers again,
please contact a qualified electrician.
... another malfunction message occurs.
If the malfunction cannot be eliminated within the con-
text of the operating instructions, please contact a qualified
electrician.
... the control unit no longer reacts to input signals, but sig-
nalises readiness for operation through the "operation" dis-
play.
Disconnect the control unit completely from the mains
for about 10 seconds using the mains switch on the installa-
tion side. If the control unit still does not work, please contact
a qualified electrician.
