VYPER
™
VARIABLE SPEED DRIVE
MAINTENANCE
100-200 IOM (FEB 09)
Page 59
check the filter precharge relay, filter precharge resistors,
and the wiring between the filter logic board and the filter
precharge relay.
Fault 67: Harmonic Filter DC Current Transformer 1
Message
Quantum: “Fault 67”
Quantum LX: “Harmonic Filter DC Current Transformer 1”
During initialization the output voltage of the two DCCT’s
which sense the filter’s input current will be monitored and
compared against a level of ± 147 mv (± 6010 A to D counts).
If the offset error falls outside this range, the unit will trip and
the Quantum
™
LX panel will display the message Fault 67. If
a DCCT error fault is not encountered, an average of eight
readings on each DCCT output will be taken and used for
DCCT offset compensation. The three phases of VSD input
current are sensed by two current transformers. The three
phases of filter input current are sensed by two D.C. current
transformers. The third filter input current is derived from the
equation I
f2
= -I
f1
–I
f3
.
Fault 68: Harmonic Filter DC Current Transformer 2
Message
Quantum: “Fault 68”
Quantum LX: “Harmonic Filter DC Current Transformer 2”
Same as Fault 67 except applying to Harmonic Filter DC
Current transformer 2.
Fault 69: Harmonic Filter High Base plate Temperature
Message
Quantum: “ Fault 69“
Quantum LX: “Harmonic Filter High Base plate Temp Fault”
The unit contains one heatsink assembly for the 305 Hp. The
Filter’s power module base plate temperature (see Appendix
I for thermistor temperature vs. A to D count) will feed plug
J6 on the Harmonic Filter Logic board. This temperature is
compared in software to a limit of 79°C and if this limit is
exceeded, the unit will trip and the Quantum
™
LX
panel will
display the message Fault 69.
A thermistor sensor is located inside the IGBT Module on
the filter power unit. If at anytime this thermistor detects a
temperature of 175°F (79°C) or higher a shutdown will occur.
A manual reset is required by pressing the “Overtemp Reset”
push button located on the Filter Logic board. This message
is usually an indication that the level of coolant in the closed-
loop system on the back of the Vyper
™
is low.
Fault 71: Harmonic Filter low DC Bus Voltage
Message
Quantum: “Fault 71”
Quantum LX: “Harmonic Filter Low DC Bus Voltage”
The DC link voltage magnitude should remain within -80 VDC
of the bus voltage setpoint determined from the peak input
voltage. If the DC link voltage magnitude falls outside this
range for 100 msec the unit will trip and the Quantum
™
LX
panel will display the message Fault 71. The harmonic filter
dynamically generates its own filter DC link voltage by the
interaction of the filter choke and switching its IGBT’s. This
DC level is actually higher than the level one could obtain
by simply rectifying the input line voltage. Thus the harmonic
filter actually performs a voltage “boost” function. This is nec-
essary in order to permit current to flow into the AC line from
the filter when the AC line is at its peak level. This particular
shutdown and its accompanying message is generated if the
filter’s DC link voltage drops to a level less than 80 VDC below
the filter DC link voltage setpoint. The filter DC link voltage
setpoint is determined by the filter logic board via the sensing
of the three phase input line-to-line voltage. This setpoint is
set to the peak of the sensed input line-to-line voltage plus
59 volts, not to exceed 760 volts and varies with the input
line-to-line voltage. If this shutdown occurs occasionally, the
likely cause is a severe sag in the input line voltage. A power
monitor should be installed to determine if a power problem
exists. Also, verify the operation of the AC line voltage isolator
board, by comparing the phase to phase voltage on J5 pins
1-3. The three voltage measurements should be almost the
same voltage, approximately 5.2 VAC.
Fault 75: Harmonic Filter DC Bus Voltage Imbalance
Message
Quantum: “Fault 75”
Quantum LX: “Harmonic Filter DC Bus Voltage Imbalance”
The 1/2 DC link voltage magnitude will remain within
± 50VDC of the total DC link voltage divided by two during
the precharge interval for both 60 and 50 Hz 519 filters. If not,
the Quantum
™
LX panel will display the message Fault 75.
The 1/2 DC link voltage magnitude will remain within ± 50
VDC of the total DC link voltage divided by two for both 60
and 50 Hz 519 filters. If the 1/2 DC link magnitude exceeds
this ± 50 volt window, the unit will trip and the Quantum
™
LX
panel will display the message Fault 75.
The Filter DC link is filtered by large, electrolytic capacitors
which are rated for 450 VDC. These capacitors are wired
in series to achieve a 900 VDC capability for the DC link.
It is important that the voltage be shared equally from the
junction of the center or series capacitor connection, to the
negative bus and to the positive bus. This center point should
be approximately ½ of the total DC link voltage. Verify the
problem truly exists using a pair of digital meters, measuring
from the series capacitor connection point (wire 525A) to
the positive bus (wire 526A), and from the series capacitor
connection point to the negative bus (wire 524A). When the
filter precharge relay engages, both voltage readings should
come up together, and have a value that is within ± 50 VSD
of each other. If you find the voltages are equal, you likely
have a problem with the filter bus isolator board, the filter
logic board, or the wiring/connectors between them. Check
the voltages at the input to the filter logic board, J5 pin 4 to
J5 pin 5 and J5 pin 5 to J5 pin 6. The voltages should be
approximately equal. If they are not, the likely cause is a bad
isolator board or a loose connection. If they are balanced, the
filter logic board should be replaced. If the voltages are not
equal, check the wiring between the bleeder resistors 12RES
and 13RES and the filter power unit. Also check the value of
these resistors. They should be 3000 ohms nominally. If no
problem can be found by performing these steps, replace
the filter power unit.
Fault 76: Harmonic Filter 110% Input Current Overload
Message
Quantum: “Fault 76”
Quantum LX: “Harmonic Filter 110% Input Current Overload”
The overload threshold and timer functions reside in software
on the Harmonic Filter’s Logic board. The unit’s three phases
of RMS output current are compared to the overload thresh-
old magnitude. If this threshold is exceeded for 40 seconds
the unit will trip and the Quantum
™
LX panel will display the
