4-52 Alarm Codes, Descriptions and Corrective Actions µP-D Controller
CSR-20 & CSR-40, September 1999
Code Description Corrective Action
44 Three Phase Current Imbalance • Check supply power voltage on all three phases.
(Shutdown Alarm) Voltage should be present on all three phases and
with 90% below or 110% above the rated voltage.
• Indicates the supply power current is
NOT equal within limits in each of the • Check for open circuits in the three phase power
three phases. circuits to the fans, heaters and compressor.
• Controller also generates alarm if phase • Disconnect supply power and check resistance of
detection circuit was unable to determine each heater leg. Correct open or shorted heaters.
correct phase rotation; or if phase contactor
ABC or CBA fails to pull in or release during • Check operation of phase contactors using the
a Pretrip test. “PS1” and “PS2” tests in the Controller Test
submenu.
• If the frequency and voltage of the power supply are
correct but the controller displays 1/2 of the correct
reading, replace the power module.
• Turn unit OFF and disconnect power supply.
Disconnect plug on current transformer and check
the resistance of each primary winding. Resistance
for each winding should be 43 +/- 0.5 ohms.
• If Alarm Code 10 is also present, check for an open
F11 fuse on the power module.
45 Frequency Out-of-Range High • Check the frequency of the supply power source
(Check Alarm) and correct as required. If the unit is operating on
generator set power supply, check the generator
• Indicates the frequency of the supply speed.
power is high.
• If the frequency and voltage of the power supply are
correct but the controller displays 1/2 of the correct
reading, replace the power module.
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