Product Introduction; Product Description; Intended Use; Identification - Grundfos LiqTec Installation And Operating Instructions Manual

4. Product introduction

4.1 Product description

LiqTec protects the pump against dry-running and
against too high liquid temperature (130 °C ± 5 °C). It
can monitor the motor temperature if the PTC sensor
in the motor has been connected.
It has a fail-safe design. If the sensor, sensor cable,
electronic unit or power supply fails, the pump stops
immediately.

4.2 Intended use

WARNING
Product failure
Death or serious personal injury
- The function of the LiqTec unit is
impaired if the unit is not installed as
described, and if peripheral components
other than those described in these
Installation and operating instructions
are connected to the LiqTec unit.
LiqTec is used to handle internal and external signals
from pumps, sensors and controls. The LiqTec
sensor has potential-free alarm- and operating relays
to stop the pump in case it detects a situation that
requires it to stop.

4.3 Identification

4.3.1 Nameplate
1 2
Type
V-No.
Product No.
U
N
11
N2042
Made in Thailand
10
Fig. 1 Nameplate
Pos. Description
1 Type designation
2 Product number
Permissible supply voltage, frequency and
3
maximum power consumption
4 Version number
5 Production code (year, week)
6 Serial number
7 Ingress protection
8 Power consumption
9 Manufacturer
10 Production site
11 Approvals and markings
4
3 4 5
P.c.
6
Serial No.
IP
P 7
MAX
T45
8
DK - 8850 Bjerringbro Denmark
9

5. Control functions

WARNING
Flammable material
Death or serious personal injury
- Use flame-retardant enclosure.
WARNING
Electric shock
Death or serious personal injury
- Always install the product in a suitable
cabinet.
1 2
12
11
10
Fig. 2
1. Connection for dry-running sensor
Service number of dry-running sensor:
96556427.
2. Connection for external restarting
3. Motor PTC
Green light indicates OK or short-circuited
terminals.
Red light indicates too high motor temperature.
The alarm relay is activated
4. Connection for PTC sensor
A PTC sensor according to DIN 44082 can be
connected to this terminal.
If the PTC sensor is not used, the terminals must
be short-circuited.
5. Sensor indicator light
Red light indicates a defective sensor or cable.
The alarm relay is activated.
6. Deactivation of the dry-running monitoring
function
Press the button to deactivate the dry-running
monitoring function. Red flashing light.
The PTC monitoring function is still active.
Press the Restart button to reactivate the dry-
running monitoring function.
3 4
5
6
7
9 8
.