ABB R-MAG 38kV 1250/2000A - Page 51

51
Capacitor bank is not
connected.
If it happens immediately when the supply
voltage is switched off and the ready LED is
immediately turned off, check the capacitor bank
circuit.
PROBLEMS
POSSIBLE
CAUSES
POSSIBLE SOLUTIONS
The closing
command is
not performed
The closing
command is
not performed
The closing coil is
broken or damaged.
Check the closing coil circuit. Disconnect the
magnetic actuator from the plug to the left of the
mechanism. There are two Phillips head screws
that keep the plug held together. The top two
wires are red and the bottom two wires are blue.
The top red (43) and top blue (45) wire go to the
"On" (close) coil. The coil should approximately
0.3 ohms.
One open input is
active.
Verify there is not a held trip signal on the
CONTROL BOARD board. Verify the voltage
across TB1-8 and TB1-3 is "0" (KM1005 3, 4),
and also across KM1005 5, 6 Safe open (if used),
and KM1005 7, 8 second trip (if used).
The block in open
input is open (manual
trip lever).
Check the manual trip lever to verify it is in the up
(normal) position. If it is, verify the microswitch
(mounted on the mechanism side) has continuity
across the wires.
The capacitor bank is
not connected.
Check the capacitor bank circuit. Verify the
capacitors are connected to the control board.
Ensure that there is 80 VDC across KM1002 ter-
minals 1 and 3.
The ready LED on
control panel is off.
See conditions under "Ready LED is off (unit not
ready)".
The control panel is
damaged or not con-
nected properly.
Verify the control panel 6-pin plug is plugged into
KM1007.
The energy in the
capacitor bank is not
enough for a CO-
operation.
Ensure the auxiliary supply voltage is connected.
See "ready light blinking" section.
The external close
input is not supplied.
Verify close command is wired to input.
The circuit breaker
closes and then
opens during a
close operation
The auxiliary contacts
are not operating
properly.
Verify the close position auxiliary contact.
The circuit breaker
doesn't reach the cor-
rect close position.
Verify the presence of unwanted objects under
the magnetic actuator plunger.