2 / 3
PE A1 A2 16 15 18
H
C
D
L
N
PE
M
max
min
PE A1 A2 16 15 18
H
C
D
L
N
PE
M
min
PE A1 A2 16 15 18
H
C
D
L1
L2
L3
N
PE
M
max
min
VS425-40
230 V AC/DC
PE A1 A2 16 15 18
H
C
D
L1
L2
L3
N
PE
M
max
min
VS425-40
230 V AC/DC
Un
24...240V AC/DC
Example of connecting the level switch to a 1-phase pump at a well, borehole
Monitoring TWO LEVELS of the FLUID LEVEL minimum / maximum - DRAINING function - PUMP
DOWN (REPLENISHING function - PUMP UP) - wiring for supply 230 V AC (for monitoring two levels)
• Description of draining function:
This function is used in a well or borehole where the diff erence between the upper and lower
probes determines how much water the pump can pump out and protect against running dry. After
detecting the maximum level, the set reaction delay begins running. After this period, the output
contact immediately switches on the pump until the minimum level is reached, when the set delay
begins running once again. The pump then switches off .
• Description of replenishing function:
This function is used when you need to regularly pump in water to a well or borehole, which is leaking.
After detecting the minimum level, the set reaction delay begins running. After this period, the output
contact immediately switches on the pump for the period until it reaches the maximum level, where
the set delay begins running once again. The pump then switches off .
• Description of wiring and settings:
a) On terminals A1-A2 (product HRH-7) connect the supply voltage in a range of 24 - 240 V AC or DC.
b) At terminal H, connect the red wire of the 3-wire cable (D03VV-F 3x0.75/3.2 see accessories) and
connect the probe SHR-2 at the end. Install this probe in the well at a height where it will monitor
the MAXIMUM level.
c) At terminal D, connect the black wire of the 3-wire cable (D03VV-F 3x0.75/3.2 see accessories) and
connect the probe SHR-2 at the end. Install this probe in the well at a height where it will monitor
the MINIMUM level.
d) At terminal C, connect the gray wire of the 3-wire cable (D03VV-F 3x0.75/3.2 see accessories) and
connect the probe SHR-2 at the end. Place this probe in a well at a height where it will be BELOW THE
MINIMUM level, because it is a common probe.
e) On terminal 15 (of the output contact), apply voltage using a jumper between A1 and 15. It is used
to bring potential to the contact for switching the pump on.
f) Connect the pump to terminal 18 (output contact) and the neutral.
g) Using potentiometer SENS for the HRH-7, set the probe reaction sensitivity (halfway is recommended).
h) Using potentiometer PUMP, set to PUMP DOWN = draining (set to PUMP UP = replenishing).
i) Using potentiometer DELAY, set the reaction delay for switching on the pump to eliminate unwanted
powering upon fl uctuations in the level. If the tank is stable, set the minimum for immediate switching
on of the pump.
Note: you can also replace the 3-wire cable (D03VV-F 3x0.75/3.2) with a 1-wire wire DO5V-K0.75/3.2
(separately for each probe).
well
Monitoring ONE LEVEL - function DRAINING - (PUMP DOWN)
- wiring for supply 230 V AC (for monitoring one level)
well
• Description of draining function:
The function is used to protect the pump against running on empty. After detecting the minimum
level, the set reaction delay begins running. After this period, the output contact immediately witches
off the pump until a level is reached above the minimum level, where the set delay begins running
once again. The pump then switches on.
• Description of wiring and settings:
a) On terminals A1-A2 (product HRH-7) connect the supply voltage in a range of 24 - 240 V AC or DC.
b) On terminal D, connect the wire (see accessories) and connect the probe SHR-2 at the end. Place this
probe in a well at a height where it will monitor the MINIMUM level.
c) Interconnect terminals H and D, because this involves monitoring a single level.
d) Connect the wire to terminal C (see accessories) and connect the probe SHR-2 at the end. Place
this probe in a well at a height where it will be BELOW THE MINIMUM level, because it is a common
probe.
e) On terminal 15 (of the output contact), apply voltage using a jumper between A1 and 15. It is used
to bring potential to the contact for switching the pump on.
f) Connect the pump to terminal 18 (output contact) and the neutral.
g) Using potentiometer SENS for the HRH-7, set the probe reaction sensitivity (halfway is recommended).
h) Set potentiometer PUMP to PUMP DOWN = draining
i) Using potentiometer DELAY, set the reaction delay for switching on the pump. In this case, we
recommend setting the time to 5 s to avoid frequent switching.
Example of connecting the level switch to a 3-phase pump at the well, borehole
Monitoring TWO LEVELS minimum / maximum - DRAINING function - (PUMP DOWN)
- wiring for supply 230 V AC (for monitoring two levels)
- wiring for supply 24 ... 240 V AC/DC (for monitoring two levels)
• Description of draining function:
The function is used to protect against overfl ows and fl ooding of areas. After detecting the maximum level, the set reaction delay begins running. After this period, the output contact immediately switches on
the 3-phase pump until the minimum level is reached, when the set delay begins running once again. The pump then switches off .
• Description of wiring and settings:
a) On terminal A1 (product HRH-7), connect the phase (230 V AC). On terminal A2 connect the neutral.
b) At terminal H, connect the red wire of the 3-wire cable (D03VV-F 3x0.75/3.2 see accessories) and connect the probe SHR-2 at the end. Install this probe in the well at a height where it will monitor the MAXIMUM level.
c) At terminal D, connect the black wire of the 3-wire cable (D03VV-F 3x0.75/3.2 see accessories) and connect the probe SHR-2 at the end. Install this probe in the well at a height where it will monitor the MINIMUM level.
d) At terminal C, connect the gray wire of the 3-wire cable (D03VV-F 3x0.75/3.2 see accessories) and connect the probe SHR-2 at the end. Place this probe in a well at a height where it will be BELOW THE MINIMUM
level, because it is a common probe.
e) Connect the power supply to the contactor (we recommend VS-425-40) = connect the contactor terminal A1 to terminal A2 on the level switch (HRH-7) or directly to N (neutral). Connect the contactor terminal
A2 to the output contact of the level switch (HRH-7) of terminal 18.
f) On terminal 15 (of output contact HRH-7), apply voltage using a jumper between A1 and 15. It is used to bring potential to the contact for switching the pump on.
g) Connect the (1-phase) pump to contactor terminals 2, 4, 6. Also connect the pump to a grounding wire or terminal PE.
h) Connect contactor terminals 1, 3, 5, 7 through a circuit breaker for each phase L1, L2, L3 (see image).
i) Using potentiometer SENS for the HRH-7, set the probe reaction sensitivity (halfway is recommended).
j) Set potentiometer PUMP to PUMP DOWN = draining.
k) Using potentiometer DELAY, set the reaction delay for switching on the pump to eliminate unwanted powering upon fl uctuations in the level. If the tank is stable, set the minimum for immediate switching
on of the pump.
well
well
protection
element
protection
element
