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Basic Concepts

Any problems with the 61F can be categorized into one of three areas. (See diagram on below.)
To find out which area is causing the problem, simulate a change in water level by using a clip or a piece of wire to create a short circuit between the electrodes. By closing and opening the circuit you can compare it with normal operating behavior. (Do not short circuit the power supply terminals.)
For example, for the 61F-GN, check that the electrodes are not submerged in water, then see what happens when terminals E1 to E3 are short circuited. Check that it resets when the short circuit is removed. If there are no problems, then conduct the same test at the terminals of the Electrode Holder, thereby finding the problematic section by process of elimination.

Flowcharts

Water Supply Control Troubleshooting

SituationItems to checkCause and Solution
[1]
Pump
does not
start.
1. Is power applied to the contact and power supply terminals?
2. Is the power supply (same phase) connected to one end of the
magnetic contact switch coil and S0 terminal of 61F?
3. Are the contact and power supply terminals screwed on properly?
4. Is the motor protection relay activated?
5. Are the electrodes in the table below touching each other, in
contact with the tank or tangled with any objects?
1. Check the fuse and no-fuse
breakers.
2. Check that the wiring of the output
relay and the magnetic contact coil is
correct.
3. If it is loose, tighten it.
4. If it has operated, remove the cause
and reset.
5. Install it correctly and if there is
something tangled on it, remove it.
6. If there is a fault, replace the wires.
7. If long wires are needed, use a
longdistance Level Controller (61F-
[]NL(-[]L) 2 km or 4 km). If the
interference is due to inductance, use
shielded wires or change the wiring.
61F-GN(G),
61F-G1N(G1)
61F-G3N(G3)61F-G4N(G4)
E1 to E3 or E2 to E3E2 to E5 or E3 to E5E5 to E8 or E6 to E8
6. Are there insulation problems with wiring of any of the following
electrode circuits?
61F-GN(G),
61F-G1N(G1)
61F-G3N(G3)61F-G4N(G4)
E1, E2 circuitsE2, E3 circuitsE5, E6 circuits
7. With a long lead wire to the electrodes (between electrode
holder and 61F), is there any interference from electrostatic
capacitance or electromagnetic inductance?
[2]
Pump
does not
stop.
If the Level Controller stops when terminals of the following are
short circuited, the problem could be any from 1 to 6.
1. Put it in properly and tighten if loose.
2. Replace if faulty. Tighten terminal
screws.
3. If there are lime deposits or grease,
it will not conduct well, so remove it
and clean.
4. If the electrodes are too far apart,
the inter-electrode resistance
becomes too high and 61F will not
operate properly.
5. If the specific resistance is high,
replace with a high-sensitivity Level
Controller (61F-[]NH (-[]H).)
6. If tape is wrapped around for
protection, leave at least 10 cm of the
end uncovered.
61F-GN(G),
61F-G1N(G1)
61F-G3N(G3)61F-G4N(G4)
E1 to E3 terminalsE2 to E5 terminalsE5 to E8 terminals
E1*E2*E5*
1. Have any of the electrodes marked with * fallen Off or becoming
loose?
2. Are any of the electrode lead wires marked with * disconnected
or have loose terminal screws?
3. Are there any lime deposits or grease on the electrodes?
4. Is the distance between the electrodes appropriate?
5. Is the specific resistance of the liquid (water) too high?
6. Is tape wrapped around the electrodes right to the end?
[3]
Rattles
when
stopping.
1. Have any of the electrodes marked with the * fallen off or
becoming loose?
2. Are any of the electrode circuits lead wires marked with *
disconnected or have loose terminal screws?
If electrodes marked with * are not
working properly, it becomes a single
point control and switches the device
ON, OFF with just a small amount of
variation in water level.
61F-GN(G),
61F-G1N(G1)
61F-G3N(G3)61F-G4N(G4)
E2*E3*E6*
3. Is there a mistake with the wiring of the electrodes shown in the
following table?
61F-GN(G),
61F-G1N(G1)
61F-G3N(G3)61F-G4N(G4)
E1 to E3E1 to E5E4 to E8

Note 1.For devices with idling prevention function, check the items listed in Water Supply Control (with Idling Prevention) Troubleshooting as well.

Note 2.For devices with full tank and water shortage alarm, refer to Troubleshooting for Full Tank and Water Shortage Alarms.

Note 3.When using a Level Controller for water supply control and it has a water shortage alarm, if the buzzer sounds but the pump doesn't start when the Level Controller is turned ON, check the water level.
If the water level is not reaching electrode E4, this phenomenon is the correct outcome for a water shortage alarm.
To start the pump in this state, create a short circuit between the electrode circuits E4 and E3 until the water level reaches electrode E4.
Re-check the alarm water level and the length of electrode E4.

Type of Electrodes

61F-GN(G)61F-G1N(G1)61F-G3N(G3)61F-G4N(G4)
Situation 1
Automatic water supply with
pump idling prevention
Situation 2
Automatic water supply with
water shortage alarm

For connection details, refer to the datasheets of 61F-G[]N, 61F-G[], 61-GP-N[], 61F-G[]P, and 61F-UHS/-HSL.

Water Supply Control (with Idling Prevention) Troubleshooting

For devices with idling prevention 61F-G1N (G1)/-G4N (G4), conduct the following checks as well.

SituationItems to checkCause and Solution
[1]
Pump does not
start.
・ Is the idling prevention circuit activated? Make
sure that electrodes E1, E2 and E3 are not too
short. (Check E1' and E2' When using 61F-G1N
(G1).)
1. Check the water level of the water supply
source. Does the water level reach E2 (E1')?
2. Are either of the electrode E2, E3 (E1', E2')
lead wires broken? Are any of the screws of E2,
E3 (E3', E2') loose?
・ Unless it is conductive between E2 (E1' when
using 61F-G1N/G1) and E8 (E3) when the Level
Controller is turned ON, and between E3 (E2')
and E8 (E3) after it has been turned ON, the
idling prevention function operates and the
motor will not move.
1. If the water level is not reaching electrode E2
(E1') when the Level Controller is turned ON,
create a short circuit between E2 and E8 (E1'
and E3) momentarily to start the motor.
[2]
Idling prevention
function is not
working.
1. Are any of the electrodes E2 and E8 or E3
and E8 (E1' and E3 or E2' and E3) touching, in
contact with the tank, or tangled with any
objects?
2. Are there any insulation problems with the
lead wires of electrodes E2 or E3 (E1' or E2')?
3. Is the Level Controller malfunctioning
because of the long lead wires?
1. Install it properly and if there is something
tangled on it, remove it.
2. If the wires are faulty, replace them.
3. If long wires are needed, use a long-distance
Level Controller. If the interference is due to
inductance, use shielded wires or change the
wiring.

Note:Items in the parentheses are for the 61F-G1N (G1).

Type of Electrodes

61F-G1N(G1)61F-G4N(G4)

For connection details, refer to the datasheets of 61F-G[]N, 61F-G[], and 61F-G[]P.

Drainage Control Troubleshooting

SituationItems to checkCause and Solution
[1]
Pump
does not
start.
1. Is power applied to the contact and power supply
terminals?
2. Is the power supply (same phase) connected to one end
of the magnetic contact switch coil and S0 terminal of 61F?
3. Are the contact and power supply terminals screwed on
properly?
4. Is the motor protection relay activated?
・ If the device starts when terminals shown in the following
table are short circuited, the problem could be any one
from 5 to 10.
1. Check the fuse and no-fuse breakers.
2. Check that the wiring of the output relay
and the magnetic contact coil is correct.
3. If it is loose, tighten it.
4. If it is active, remove the cause and reset.
5. Install it correctly and if there is something
tangled on it, remove it.
6. Replace if faulty. Tighten terminal screws.
7. If there is lime deposits or grease, it will
not conduct well, so remove it and clean.
8. If the electrodes are too far apart, the
interelectrode resistance becomes too high
and 61F will not operate properly.
9. If the specific resistance is high, replace
with a high-sensitivity Level Controller (61F-
NH (-[]H).)
10. If tape is wrapped around for protection,
leave at least 10 cm of the end uncovered.
61F-GN(G),
61F-G2N(G2)
61F-G3N(G3)
Between electrodes
E1 and E3
Between electrodes E2 and E5
E1*E2*
5. Are any of the electrode circuits lead wires marked with
* in the above table disconnected or have loose terminal
screws?
7. Are there any lime deposits or grease on the electrodes?
8. Is the distance between the electrodes appropriate?
9. Is the specific resistance of the liquid (water) too high?
10. Is tape wrapped around the electrodes right to the end?
[2]
Pump
does not
stop.
1. Are the electrodes in the table below touching each
other, in contact with the tank or tangled with any objects?
1. Install it correctly and if there is something
tangled on it, remove it.




2. If there is a fault, replace the wires.


3. If long wires are needed, use a long-
distance Level Controller (61F-[]NL(-[]L)
2 km or 4 km). If the interference is due to
inductance, use shielded wires or change the
wiring.
61F-GN(G),
61F-G2N(G2)
61F-G3N(G3)
Between E1 and E3
or E2 and E3
Between E2 and E5
or E3 and E5
2. Are there any insulation problems with the lead wires of
any of the following electrodes?
61F-GN(G),
61F-G2N(G2)
61F-G3N(G3)
E1, E2 circuitsE2, E3 circuits
3. With a long lead wire to the electrodes (between
electrode holder and 61F), is there any interference from
electrostatic capacitance or electromagnetic inductance?
[3]
Rattles
when
starting.
61F-GN(G),
61F-G2N(G2)
61F-G3N(G3)If electrodes marked with * are not working
properly, it becomes a single point control
and switches the device ON, OFF with just a
small amount of variation in water level.
E2*E3*
1. Are any of the electrodes marked with * fallen off or
coming loose?
2. Are any of the electrode circuits lead wires marked with
* in the above table disconnected or have loose terminal
screws?
3. Are the contactor or 61F terminals screws coming loose?
4. Is there a mistake with the wiring of the electrodes
shown in the following table?

Note:For devices with full tank and water shortage alarm, refer to Troubleshooting for Full Tank and Water Shortage Alarms.

Type of Electrodes

61F-GN(G)61F-G2N(G2)61F-G3N(G3)

For connection details, refer to the datasheets of 61F-G[]N, 61F-G[], 61-GP-N[], 61F-G[]P, and 61F-UHS/-HSL.

Troubleshooting for Full Tank and Water Shortage Alarms

The following table provides specific check points for each model for various problems and check items.

SituationItems to check61F-G1N(G1)61F-G2N(G2)61F-G3N(G3)64F-G1N(G4)
[1]
Full tank
alarm
sounds
when the
tank is
not full.
1. Are the electrodes touching
each other, in contact with the
tank, or tangled with any objects?
2. Are there insulation problems
with the wiring of any of the
following electrode circuits?
・ With long leads to the electrodes
(between electrode holders and
the 61F), is there any interference
from electrostatic capacitance or
electromagnetic inductance?
---1. E4 and other
electrodes *
2. E4
1. E1 and other
electrodes *
2. E1
Elevated tank
1. E4 and other
electrodes *
2. E4
Water supply
source
1. E1 and other
electrodes *
2. E1
[2]
There is a
shortage
of water
but the
alarm does
not sound.
1. E4 and E3
2. E4
---1. E4 and E5
2. E4
Elevated tank
1. E7 and E8
2. E7
Water supply
source
1. E3 and E8
2. E3
[3]
The tank
is full but
the alarm
does not
sound.
・ If shorting the terminals listed
under 1 for each 61F model
restored normal operation, then
the problem is one the following.
2. Are any of the electrodes that
have fallen off or come loose?
3. Are any of the electrode leads
disconnected or have any of the
terminals listed under 4 for each
61F model come loose?
・ Are there any lime deposits or
grease on the electrodes?
・ Are the electrodes too far apart?
・ Is the specific resistance of the
liquid (water) too high?
・ Is tape wrapped around the
electrodes right to the end?
---1. E4 and E3
2. E4
3. E4
4. E4, E3
1. E1 and E5
2. E1
3. E1
4. E1, E5
Elevated tank
1. E4 and E8
2. E4
3. E4
4. E1, E8
Water supply
source
1. E1 and E8
2. E1
3. E1
4. E1, E8
[4]
Water
shortage
alarm
sounds
when
there is
no
shortage.
1. E1' (E4) and
E3
2. E4
3. E4
4. E1' (E4), E3
---1. E4 and E5
2. E4
3. E4
4. E4, E5
Elevated tank
1. E7 and E8
2. E7
3. E7
4. E7, E8
Water supply
source
1. E3 and E8
2. E3
3. E3
4. E3, E8

* Even if the alarm electrode has no contact with the common electrode, it becomes conductive when it can come into contact with any other electrodes when the water level rises.

Inspecting the Electrode Circuits

If the electrodes cannot be withdrawn to test the electrode circuit, a tester can be used to measure the resistance between the electrode and ground, as shown in the diagram on the right. The measured resistance value indicates the length, contact condition, and mounting condition of the electrode.
For example, the sequence of electrodes ordered from low measured resistance to high is E3 (long), E2 (medium), and E1 (short).
Follow the guidelines below to use this test method.

(1)Detach the leads from the 61F.

(2)Measure the conducting status with the tank full.
(The water level must be at E1 or higher.)

(3)Measure the insulating status with the tank empty.
(The water level must be at E2 or lower.)

Measuring the Resistance between Electrodes

Measure the resistance between the electrodes if the wiring is correct but the 61F does not operate. Measure with a voltmeter using the voltage drop method, as shown on the right.
The resistance between electrodes (resistance of liquid between E1 and E3) is given by the following equation.

R: Resistance of liquid between electrodes (kΩ)
V: Voltmeter indicated voltage (V)
I: Ammeter indicated current (mA)

Select the 61F model according to the R (resistance) value.

Inspecting the 61F-11N Relay Unit

Apply the specified power supply voltage with the Relay Units connected to the 61F. Refer to the connection diagrams (internal wiring diagrams) and short the 61F ground terminal to the operating terminal of each Relay Unit. Check the operation of the relay output contacts with a tester. With the 61F-11, the indicator will be lit when the Relay Unit operates.