Reset Button And On-Off-Auto Selector Switch - Grundfos LCD 108 Installations- Und Bedienungsanleitung

4.5 Reset button and ON-OFF-AUTO selector switch

Parallel operation with 3 float switches, pages
The reset button is a push-button for manual resetting of alarm signals to external alarm devices and the built-in
buzzer (i.e. not for resetting of the alarm memory as this is reset by means of the ON-OFF-AUTO selector switch,
see position OFF ( )).
Even if the fault condition still exists, the external alarm devices and the built-in buzzer will be reset when the reset
button is pressed.
The ON-OFF-AUTO selector switch for each pump has three different positions:
ON ( )
, top position:
• The pump will start when the selector switch is pushed into this position (unless the motor protection relay has cut
out the pump).
• If the PTC resistance/thermal switch of the motor registers overtemperature, the pump will not be switched off.
Note: It is the user's responsibility to decide how long the pump is to run with this fault indication. Over a long
period, the pump will be damaged!
In explosion hazard areas, switch 10 of the DIP switch must be set as stated in section 4.2. Consequently, the
pump cannot be started when the PTC resistance/thermal switch of the motor registers overtemperature.
OFF ( )
• The pump cannot start when the selector switch has been set to this position.
1 2
• The alarm memory is reset by pushing the selector switch into position OFF ( ). The alarm memory is the light
indication of a fault condition which has disappeared. If a fault condition still exists when the selector switch is
pushed into position ON ( ) or AUTO ( ), the alarm indication will be repeated immediately.
AUTO ( )
• The pump is controlled by the input signals from the float switches and the pump according to the selected DIP
switch setting.
• Alarm signals will automatically be reset. Switch 9 of the DIP switch can, however, be set to manual resetting
which is carried out by means of the reset button, see section 4.2.
• The pump will restart automatically when a given fault condition disappears. However, this is dependent on the
setting of switch 10 of the DIP switch, see section 4.2.
• When the pump starts automatically after a fault condition which has disappeared, the indicator light will continue
to show the fault condition (alarm memory) and the indication can only be removed by resetting the alarm memory,
see position OFF ( ).
142 and 143.
, middle position:
, bottom position:
11