CRE-9 Both DPU Failed

CRE-9 

• PA Header Control
• BCW-C OLCS
• CMC Logic
• Metal Temp SH, RH
• Economiser Bypass Damper control

What happens when Both DPU failed?

• PA Header Pressure Bad/ PA Header control Parameters Bad
• BCW-C  Parameters Bad
• CMC Logic out
• Metal Temp Bad
• Eco Bypass Damper Control Bad

What To do?

• Take Machine in Hydraulic mode and Isolate EHTC from Rack
• Isolate PA fan Blade-pitch supply from Switch-gear or actuator Control to Manual/OFF from local
• Take CB of BCW-C in switchgear mode from switchgear
• Now Call the C&I Personnel to force PA Header Pressure Transmitter value(T1,T2, T3) to near the freeze value that is 820 mm WC
• Give healthy value to PA Hdr Pressure selector (Putting ! before each xmtr value )in Header control tag
• Now Rectify DPU Problem/ Reset it
• Ensure both DPU working fine
• Now Normalise Both PA fan BLade Pitch from local/Switchgear
• Modulate Blade-pitch of both PA fans  
• Put Blade-Pitch on auto and Control in Auto too
• Normalise BCW-c from switchgear
• Put machine in EHG by normalising from local rack
• Put machine in CMC