At target cos phi=1 and inductive
load, switch-off or connection of
capacitor in the corrected line
Supply / Drawing mismatched
Wrong line cos phi is
Displayed
Display:"UNDER CURRENT”
Display: "OVERCURRENT”
Display: "UNDERCOMPENSATED”
Display: "OVERCOMPENSATED”
Stages are disconnected for an
inductive line or connected for a
capacitive line
The controller does not connect all
stages
In automatic operation, individual
stages are not connected or
disconnected
In strongly asymmetrically loaded
lines, differences may occur
between control response and
power-factor measurement, as the
power factor is measured in single
phase.
Check terminals of the measuring voltage
and current (l and k)!
Check phase position
Current in measuring range?
Line interruption?
Wrong current-converter factor?
Current transformer short-circuited?
Check current-converter ratio
Go through measuring current range
Check connection and phase position!
Compensation network sufficiently
dimensioned?
Check connection and phase position!
Capacitive grid, although all stages
disconnected
If a target cos phi is set which deviates
from 1 despite an inductive line load, the
display <- (disconnect stages) may light
up. The arrows indicate the control
direction and not the line conditions.
Check END STOPP!
Check whether individual stages are
programmed as fixed stages or OFF in the
"Manual operation / Fixed stages” menu!
Line measurements allow the most
favorable phase for measuring the power
factor to be determined. The current
converter is set accordingly for the
measuring current.
Section 9 Troubleshooting
Check / Solution
- 17 -
Summary of Contents for BR 604
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