Siemens GEAFOL Neo, Руководство по эксплуатации, Страница: 26 / 32

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9.3 Frequently asked questions guidelines (chart)
S/N Question Possible cause Corrective measure
1
Temperature controller
does not display
Temperature controller power cord is not connected
Measure whether the temperature controller power
interface is energized and required to reconnect the
power supply (85 ~ 250 V)
It is internal failure of temperature controller, power interface of
temperature controller is energized, but panel indicator lamp is not on
Contact Siemens After Sales Service Center to replace
with a new temperature controller
2
Temperature
controller three phase
temperature display
FOC or FCC
Wrong or poor connection or loose connection of temperature sensor
Check and press the temperature sensor wiring and
tighten it according to the auxiliary wire diagram on
the transformer certificate of conformity
Temperature sensor probe is damaged
Contact Siemens After Sales Service Center to replace
the temperature sensor
Three-phase
temperature display of
temperature controller
differs greatly
Temperature sensor probe is not fully inserted into thermometer tube
(three-phase probe is inserted at different depths)
Check the position of the temperature probe and
place it correctly
Cooling fan is damaged
Contact Siemens After Sales Service Center to replace
with a new cooling fan
Temperature sensor probe is damaged
Contact Siemens After Sales Service Center to replace
with a new temperature sensor
Three-phase load of transformer is not balanced Check three-phase load and voltage, current
3
The temperature
controller cannot
communicate properly
with the monitoring
device
Wrong address setting for temperature controller
Please refer to the use manual for the temperature
controller
The communication cable of the temperature controller and the strong
electric cable are arranged together, which causes the interference of the
communication signal
Properly lay out the cables
4 Noise is abnormal
Primary side voltage exceeds tapping rated voltage
Disconnect the power of transformer and adjust tap
gear, refer to Item 8.1
The bus bar is not fixed well and there is resonance. The transformer is not
well fixed with the ground, and the resonance enclosure plate is not fixed
tightly, and there is resonance
Bus bar, enclosure board and transformer base are
well fixed
There are unclamped free ends in the iron core or clamping parts, and
there are high frequency vibrations during the excitation of the iron core,
resulting in abnormal noise
Check the fastening core and clamping piece and
press the free end tight with insulating material
Within the same power distribution room, multiple devices are placed
close together, causing wall reflections and noise overlapping
Reasonably lay out equipment position in power
distribution room
In the transformer load, equipment such as frequency converter produces
large harmonics in the system, which makes the core excitation uneven
and causes noise
Filter device is designed in low voltage system
Transformer is under overload operation state Check the load and distribute the load reasonably
5
Cooling fan is not
running
Temperature does not reach fan start temperature value
Refer to Item 7.1. 1 for factory temperature setting
value and setting method
Cooling fan is damaged
Contact Siemens After Sales Service Center to replace
with a new cooling fan
6
Low side output
voltage is high or low
Grid input voltage is high or low Adjust the tap gear of transformer, refer to Item 8.1
7
Transformer over-
temperature alarm, trip
Transformer overload (overvoltage, over current) operation Check transformer load
Cooling of transformer fails
Check whether the cooling fan is working properly
and check whether the cooling air duct is blocked
8
Winding surface
discharge
Severe stains (dust, etc.) on the surface of the winding Clean stains on windings, pads, etc.
Short circuit on high and low voltage lines Check high-voltage lines
High and low voltage transmission lines suffer from overvoltage impulse Optimize system protection functions
There is insufficient distance between metal structure and winding
Refer to 6.6 minimum insulation clearance
requirements
9
Winding ablation and
blackening
Upon the service life of the transformer and natural damage; poor heat
dissipation; long-term overload; short circuit of external wiring; system
overload; wrong cable connection; metal foreign body falling into the
cooling air duct of the winding; unscrewed torque of tap gear bolt; short
circuit fault inside the winding, etc.
On-site inspection is required. Please contact Siemens
after-sales service center for such inspection.
9. Maintenance