ABB DCS800 Installation And Start-Up Manual page 65

angle should be set to values higher than 95 degrees. Allow the system some
moments to adapt to the new value. This limits the output voltage of the drive
and gives a safe operation, even with a fault in the current feedback circuit.
Precautions should be made do avoid to get EMF at the DC circuit (disable
field current or block the motor), if the drive will be released and will generate
current.
•
Switch on the drive using the ON/OFF command. The RUN command has to
remain in logic "0" level. This action causes the pulse firing logic to work and to
generate single firing pulses at inverter limit position. No current should flow.
Record the thyristor voltage (connection U1 – C1) and the firing pulse (e.g. by
means of a current probe) and check the firing pulse position being at 150°el.
•
Switch off the drive.
•
Connect the gate leads to thyristor V14, 16 and 12.
•
Switch on the drive using the ON/OFF command.
•
No current should flow! Record the thyristor voltage and the firing pulse as be-
fore.
•
Switch off the drive.
•
Switch on the drive using the ON/OFF command. Set the RUN command to
logic "1" level. Generate small current references within zero and limit discon-
tinuous / continuous current. Everything is o.k., if the current can be varied and
does not hit the limit set by the parameter above or inverter limit position. De-
pending on the value of the minimum firing angle (perhaps higher than 120°
perhaps close to 150°
very small one. In this case change the settings step by step until a value
around 100°
reached.
el
•
Switch off the drive.
•
In case of trouble check the wiring for open loop or wrong connections. Do the
check once again.
•
In case the current can be varied by the reference and the power part consists
of a reverse bridge go on with the same procedure used for the forward bridge.
Keep the value of the parameter for minimum firing angle position. Check for
correct connections.
If current is flowing in forward and reverse direction in a controlled manner set the
parameter for the minimum firing angle back to default. Check for the correct value
for the parameter of the bridge changeover time.
In case the power part consists of parallel bridges do the gate interconnections
bridge per bridge and check for correct assignment. Do the commissioning of the
other parallel bridges once again with the minimum firing angle set to high values
because of safety reasons.
When the gate connections are done and current is flowing in a controlled manner
set the minimum firing angle position to default, the bridge changeover time to val-
ues necessary and go on with the other steps necessary to get the drive into op-
eration.
3ADW000197R0101 DCS800-R Sel e a
) it may happen, that there is either no current at all or a
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63
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Start-up