Issue February 2002
Document Number: 13124
- 32 -
7.2 General faults
Fault display Cause
Display remains blank.
- supply voltage is missing.
- equipment fuse is defective. Possibly the applied supply voltage is too high.
Controller does not react to changes; display shows actual cos ϕ
and LED 'AUTO' flashes.
- Controller has been changed to 'MAN', press key to revert to automatic
operation.
Controller is hunting.
- C/k value is too low (only with AU3 mode)
Controller displays a capacitive power factor while inductive
load is present, and no capacitor steps are switched in.
- C.T. connection k/l (S1/S2) is mixed up (only with AU3 mode)
The set target power factor is reached but does not coincide with
the actual power factor of the plant.
- a wrong measuring voltage connection is set in mode AU2 or AU3.
The displayed current does not coincide with the actual current.
- the current transformers connected to the summation current transformer are
wrongly 'poled'.Terminals k/l (S1/S2) are mixed up, i.e. the currents are not added
up but subtracted.
- the current measuring path of the Controller is connected in parallel with other
measuring equipment; current measuring paths should be connected in series.
- A wrong setting of the C.T. transformation ratio k (parameter 18) was made.
Upon switching it in, the Controller starts with initialization
mode AU2 and, after this mode is completed, operates
incorrectly.
- Controller is set to AU1 and uses wrongly memorized data. Possibly the Controller
had been applied in another plant before, wiring of measuring connections were
changed, or a fault occurred with mode AU1.
- refer to items 6.0 and 6.3 'setting menu' in order to select the initialization mode
new.
To Next Page
