Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) - Classic Control - Manual (Page 427)

Troubleshooting 7-5
7000 “B” Frame 7000-UM150I-EN-P – June 2013
FAULT
MESSAGE
FAULT
CODE
DESCRIPTION RECOMMENDED ACTIONS
Conductivity Hi
(C-Frame Only)
227 The measured coolant conductivity is
greater than 2 μS/cm
3 .
– Verify that no foreign debris has entered
the system (iron piping, non-deionized
water, etc.)
– Change the de-ionizing cartridge and run
the system, verifying that the conductivity
is decreasing
Coolant Level Lo
(C-Frame Only)
228 The measured coolant level within the
reservoir has dropped below the second
(lowest) level sensor and the drive has
faulted. This sensor is set for the minimum
level required to ensure there will be no air
drawn into the system through the reservoir.
– Verify that the drive cooling system does
not have any coolant leaks – repair if
found
– Add the proper amount of de-ionized
water to get the level above the warning
sensor (de-ionized water will evaporate,
not the glycol)
Coolant Temp Hi
(C-Frame Only)
226 The measured coolant temperature has
exceeded 54°C (129°F).
– Verify the heat exchanger fans are
operating
– Verify that the thermostatic valve is fully
opened
– Check that all valves are in the normal
operating position
– Verify that the drive is operating within
specified load and ambient conditions
Coolant Temp Lo
(C-Frame Only)
225 The measured coolant temperature has
dropped below 4°C (40°F). It will not clear
until the coolant temperature reaches 10°C
(50°F). This fault will only occur if the drive
is not running, to stop you from starting with
a low coolant temperature. If you are
already running when the coolant level
drops, you will only get a warning.
– Verify that the thermostatic bypass valve
(V10) was not left open
– Verify that the ambient temperature
within the drive control room is not below
specification
– Warm up the control room ambient to get
the drive to an operational level
Current Sens 178 Current Sensor fault – If you have the Line HECS/CT code, the
line current measurement is not what is
expected at this level of dc current.
Either of the CT DC HECS and there
burden resistors may be damaged or
programmed incorrectly. For example,
the DC HECS may actually be 2500:1,
the drawings and parameters indicate
4000:1. Another cause would be an
unplugged DC HECS.
– If you have the CT Phs Seqn code, the
CTs are likely swapped. For example the
CT/wiring for 2U has been switched with
2W.
– If you have the CT Phs/Alpha code, the
rectifier is firing with the wrong firing
angle relative to the angle measured
from the line current. This can occur
when the CTs on an 18-pulse rectifier are
switched between master and slaves.