Electrical Connection - Grundfos LiqTec Manual Del Usuario

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Description
The LiqTec
• protects the pump against dry-running.
• protects the pump against too high liquid tempera-
ture (130°C ±5°C).
• can monitor the motor temperature if the PTC sen-
sor in the motor has been connected.
• has a fail-safe design. If the sensor, sensor cable,
electronic unit or power supply fails, the pump
stops immediately.
Functions
1 2
12
11
10
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 termi-
nals.
Red light indicates too high motor temperature.
The alarm relay is activated
4. Connection for PTC sensor
A PTC sensor according to DIN 44 082 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 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.
4
3 4
5
6
7
8
9
.
Mounting the LiqTec sensor
The LiqTec can be fitted to a DIN rail to be incorpo-
rated in a control cabinet.
See illustrations on page 24.

Electrical connection

Example of electrical connection, see page 25.
Calibration of sensor and LiqTec
Follow the procedure on the next page.
7. High liquid temperature indicator light
Red light indicates too high liquid temperature
(130°C ±5°C).
The alarm relay is activated.
8. Supply voltage
200-240 V, 50/60 Hz.
9. Dry-running indicator light
Green light indicates OK (liquid in pump).
Red light indicates dry running (no liquid in
pump).
The alarm relay is activated.
10. Alarm/Run relay output
Potential-free changeover contact.
Maximum contact load:
250 V, 1 A, AC (inductive load)
11. Auto/Man
Changeover between automatic and manual re-
starting.
The default setting is Man.
Changeover is carried out by means of a small
screwdriver.
When Auto has been selected, the alarm indica-
tion will automatically be reset 10 to 20 seconds
after liquid detection.
12. Restart
Press the button to restart the pump. The button
has no influence on the PTC monitoring.
.