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LED FAULT INDICATIONS
WITH REASONS AND POSSIBLE SOLUTIONS |
|
R Y
G |
Symptom or Reason |
Remedy |
 |
[Back to LED Selection] |
On single phase
units:
 |
Measure the AC voltage between live and
earth. This should be between 190 and 250 volts. |
|
Measure the AC voltage between neutral and
earth. This must not be more than 5 volts. |
|
Disconnect the power and then measure the
resistance of the primary winding of the transformer on the Motorscope
unit. (±1.5kΩ) |
|
If the above steps does not reveal the
source of the problem, try to switch the live and neutral wires. |
On three phase
units:
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Measure the AC voltage between each one of
the phases and earth. This should be ±220 volts. |
|
Disconnect the power and then measure the
resistance of the primary winding of the transformer on the Motorscope
unit. (±5kΩ) |
On Panels:
|
Make sure that the on/off switch is
working, by measuring its continuity. |
|
 |
[Back to LED Selection] |
On
single phase units only:
|
See the
Motorscope unit’s installation instructions for the
Run, Start and
Common wire definitions. |
|
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Phase sequence error
| Phase sequence incorrect |
| Phase failure |
[Back to LED Selection] |
On three phase units only:
| Swop two incoming phase wires at the isolator. |
|
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Voltage error
| The supply voltage differs more than 15% from the rated
operating voltage. |
[Back to LED Selection] |
On single phase units:
| Measure the AC voltage between live and earth. This
should be between 190 and 250 volts. |
| To improve the voltage measurement of the Motorscope
unit, the earth wire must be removed and the neutral and earth terminals
of the Motorscope unit must be bridged. |
On three phase units:
|
Measure the AC
voltage between each one of the phases and earth. This should be ±220
volts. |
| If all of the phase measurements to earth is ±220
volts, the voltage measurement of the Motorscope unit may be improved by
placing a bridge between the earth and COM terminals of the Motorscope
unit. |
NOTE:
| When the supply voltage recovers and stays within the
safe limits for 15 min, normal operation resumes. |
|
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Underload
(restart timer enabled) (Default)
[Back to LED Selection] |
| A run-dry condition has occurred and the Motorscope
unit will automatically attempt to restart the motor after the underload
timer has run out. The timer may be adjusted on the Motorscope unit. |
|
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Underload
(restart timer disabled)
[Back to LED Selection] |
| A run-dry condition has occurred and the Motorscope
unit will only restart after a manual reset (this is done by
switching the power off and then on). The Motorscope unit can be
restarted automatically if the underload restart timer is enabled. |
|
| Broken shaft or belt |
| Blocked pump inlet or outlet |
[Back to LED Selection] |
| If the Motorscope unit continues to trip in an
Underload
condition, even when the bore-hole’s water level is restored, the pump
should be pulled out and inspected. |
|
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Over current
| The motor has drawn 40% more current than the
calibrated value. |
[Back to LED Selection] |
On single phase units:
| Verify that the correct size motor is fitted to the
controller. There are different controllers for different motor sizes
depending on the amount of current which is drawn under normal running
conditions (as specified by the motor manufacturers). |
On three phase units:
| Verify that the resistance over the external current
transformer is correct (refer to the
External C.T.
Resistor Table at the bottom of this page). |
|
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Overload
| The phase angle is too small |
|
| The phase angle may be viewed with the
Optimizer . A
phase angle lower than 27 degrees indicates an overloading motor, or a low
voltage at the motor. Verify the current, if that is correct then verify
the wire diameters. Refer to the
Cable Diameter Tables on the bottom of this page. |
|
| Jammed pump |
| Damaged motor bearing |
|
| Measure the current in each one of the wires going to
the motor, while the pump is running. If any one of the currents exceeds
the motor’s rated current, it is usually an indication of either a jammed
pump or a damaged motor bearing. |
|
| A wire to the motor is loose |
| A wire to the motor is broken |
|
| Verify that all the wires to and from the contactor are
securely fastened. |
| Disconnect the motor’s wires from the contactor. Number
them 1, 2 and 3. Measure the resistance between 1 and 2, 2 and 3, 1 and 3.
If any of these measurements exceeded 300Ω, one of the cables is broken or
most probably has a dry-joint. |
|
| A starter contact is burned |
[Back to LED Selection] |
| Disconnect the power cables from the starter contactor.
Push the contactor in and measure the continuity from L1 to T1, L2 to T2
and L3 to T3. If any of these measurements are open-circuit, it is an
indication that the contact is burned. |
|
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Overload restart delay
(Any one of the above reasons for an overload.)
[Back to LED Selection] |
|
Wait for the overload
delay timer to run out. The Motorscope will automatically attempt
to restart the motor. However, if three consecutive overload errors
occurred, it will not attempt to restart the motor again and an overload
error will be indicated. |
|
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Auxiliary trip
| The state of a peripheral device (e.g. float switch,
pressure switch, etc.), connected on the AUX port of the controller,
changed (from open-circuit to closed-circuit or vice-versa) and thus
caused a trip. |
[Back to LED Selection] |
| Verify that the peripheral device is active. If so, the
Motorscope unit is functioning correctly. The Motorscope unit should
automatically restart the motor once the peripheral device returns to its
previous state. If the trip occurred during the wrong state of the
peripheral device, the Optimizer may be used to alter the passive state of
the peripheral device from “normally closed” to “normally open” or
vice-versa. |
| Verify that the wires at the AUX and COM connections
are securely fastened. |
| The functionality of the auxiliary input may be tested
by placing a bridge between the AUX and COM terminals of the Motorscope
unit. |
|
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No Current
| No current is measured. |
|
| Verify that the wires from the Motorscope unit to the
motor are properly connected. |
| Verify that the contactor pulls in. If the contactor
does not pull in, verify that two different phases are connected over the
coil of the contactor. |
|
| The current transformer is connected in the wrong phase |
[Back to LED Selection] |
| Ensure that L3 runs through the current transformer. |
|
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Motor restart delay
| According to the motor manufacturers, a certain period
of time has to pass between two motor starts to prevent the motor from
over-heating. |
[Back to LED Selection] |
| Wait for the TTemp
timer to run out. The default time is determined by the following formula:
TTemp = (CT ratio) x 2 minutes. The TTemp timer may
be changed with the Optimizer. The TTemp timer may also be
disabled, but in doing so you will forfeit all rights on warranty claims,
as the motor could then be used outside of its safe operating conditions. |
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