Protection And Control Functions; Pump Controllers; Level Controllers; Gu01 And Gu02 - Grundfos DWK Serie Montage- Und Betriebsanleitung

7. Protection and control functions

7.1 Pump controllers

The pumps can be controlled via the Grundfos
controllers: LC, LCD 107, LC, LCD 108 and LC, LCD
110.
E1 E2 E3
Maximum
Minimum
Fig. 14 Pump controllers

7.2 Level controllers

LC controllers are for single-pump installations. LCD
controllers are for two-pump installations.
The following LC and LCD pump controllers are
available for level control:
• LC 107, LCD 107 with air bells
• LC 108, LCD 108 with float switches
• LC 110, LCD 110 with water level electrodes.
In the following description, "level switch" can be air
bells, float switches or water level electrodes,
depending on the pump controller selected.
7.2.1 LC, LCD
The LC controller is fitted with two or three level
switches: one for start and one for stop of the pump.
The third level switch, which is optional, is for high-
level alarm.
The LCD controller is fitted with three or four level
switches: one for common stop and two for start of
the pumps. The fourth level switch, which is optional,
is for high-level alarm.
For further information, see the installation and
operating instructions for the pump controller
selected.
16

7.3 GU01 and GU02

GU01 is a monitoring device for monitoring the stator
temperature and water penetration into the motor. It
receives a digital signal.
GU02 is a monitoring device for monitoring stator
and bearing temperature as well as water
penetration into the motor. It receives an analog
signal.
Both monitoring devices must be connected to the
control panel via a relay.
GU01 and GU02 are manufactured for Grundfos. For
further information, please contact your local
Grundfos company.
For further information, see the data sheets for GU01
and GU02 at www.grundfos.com.

7.4 Switches and sensors

All DWK.H pumps have thermal protection
Maximum
incorporated in the stator windings as standard.
Pt100 sensor is available as optional for stator
windings and bearing.
S1
Minimum
S3
Description
Stator windings
Bearing
Motor housing
Pump power [kW]
Sensor
type
5.5 - 15
Bimetal Built-in Built-in
Pt100 Optional Optional
Pt100 - Optional
Electrode Built-in Built-in
22-90