Figure 8-2 Flow Chart Of Anti-Dew Startup Sequence (Pf2) - ABB PCS6000 User Manual

NO
T1
T < T
CCU
YES
Control unit Control unit
space heater
space heater
OFF ON
NO
Cooling
pump OFF
Converter cabinet
auxiliary power
ON
Converter is
ready for
start-up
End
Figure 8–2 Flow chart of anti-dew startup sequence (PF2)
PRODUCT
PCS6000
Start
Lim1
NO
T2
T < T
CCU Lim2
NO
H1
H < T
CCU Lim1
YES
Control unit
auxiliary power
ON
Converter cabinet
dew conditions valid
f(T , H )
CCA CCA
YES
Heat exchanger
bypass
Open
Cooling
pump ON
DOCUMENT KIND
User manual
The auxiliary power feeding of the converter is switched ON.
The temperature limit switch (T1) inside the Converter Control Unit
(CCU) monitors the cubicle inside temperature.
– IF the temperature stays below the limit setting, the cubicle
space heater is switched ON.
– IF the temperature stays above the limit setting, the cubicle
space heater is switched OFF, respectively remains
switched OFF.
The combination of the temperature limit switch (T2) and the
humidity limit switch (H1) monitors the dew conditions inside the
converter control unit.
– IF the temperature stays below the limit setting OR the humidity
stays above the limit setting, the feeding of the auxiliary power
to all other components of the Control Unit stays OFF.
– IF the temperature stays above the limit setting AND the
humidity stays below the limit setting, the feeding of the
auxiliary power to all other components of the Control Unit is
switched ON.
After the auxiliary power of the Converter Control Unit is switched
ON the converter control system starts up and is now able to do
the converter control.
The controller is now monitoring the dew conditions of the
Converter Cabinet by a PT100 temperature sensor and a
humidity sensor.
– IF dew conditions are detected:
• Heat exchanger bypass valve gets fully OPEN to minimum
cooling and other things
• Cooling pump is switched ON
– IF dew conditions are not detected:
• Cooling pump is switched OFF, respectively remains
switched OFF
• Feeding of the auxiliary power of all other components is
switched ON.
• Converter will now start-up completely and enters the
converter OFF-mode state.
DOCUMENT ID.
3BHS600000 E40
OPERATION
REV. LANG. PAGE
G en 100/114