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Prior to starting up the system, the paralleling control module needs
to know what size of QAS is going to be connected.
Therefore proceed as follows:
1. Go to ‘SETUP’
⇒
‘PROGRAM’
⇒
2. Voltage match:
set at 5 %
3. Freq match:
set at 0.25 Hz
4. Phase match:
set at 20 deg
5. Go to ‘SETUP’
⇒
‘SETUP’
⇒
6. CT ratio A, B, C: primary current divided by secondary current
7. PT ratio:
1
8. Gen Power:
xxx kW: see technical specifications for nomi-
nal values
9. Sys Volt:
Bus voltage: 208 – 240V
⇒
240V
400 – 480V
⇒
480V
10.Bus Freq:
50 or 60Hz depending on what frequency the
QAS is set up.
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– Put on both generators the selector switch “Single/Parallel” in the
“Parallel” position.
– Start both generators.
– Run the engines for approximately 5 minutes to warm up and stabi-
lize speed and voltage.
– Try to match frequency and voltage of both generators as close as
possible.
– Switch on the main circuit breakers Q1 of both generators.
– Push the button “Breaker/Contactor close enable” on the SAPE of
the first generator (master).
– Push the button “Breaker/Contactor close” on the SAPE of the first
generator.
– Push the button “Breaker/Contactor close enable” on the SAPE of
the second generator (slave).
When both generators are synchronized, the circuit breaker of the
SAPE of the second generator is automatically closed and the sec-
ond generator starts supplying power together with the first one.
The paralleling control modules will share the load evenly between
the generators, according to the capacity of the units. It will also de-
tect a circulating current and will deactivate one of the units if the
circulating current exceeds the value set on the load sharing module.
It is possible to lower the circulating current by better matching the
voltages of the generators. Therefore adjust the voltage on one or
more generators.
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– Refer to the manuals of the applicable generators for the check ac-
tions to be performed during operation.
– Regularly check the amperemeters on both generators and the
clamp meter which measures the circulating current.
Note that the ratio needs to be entered, not the pri-
mary current rating,
e.g.: current transfo 600/5
→
ratio to be entered = 120
Note the difference between 50 and 60Hz,
e.g.: QAS168 50Hz = 120kW
60Hz = 144kW
Make sure that the generators are connected cor-
rectly before starting operation.
Summary of Contents for SAPE
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