VYPER
™
VARIABLE SPEED DRIVE
MAINTENANCE
100-210 IOM (
JUL
09)
Page 63
Fault 29: Vyper Logic Board Power Supply
Message
Quantum: “Fault 29”
Quantum LX: “VSD Logic Board Power Supply Fault”
The various DC power supplies which power the Logic Board
are monitored via hardware located on the Logic Board. If
any of these power supplies fall outside the allowable limits,
the unit will trip and the Quantum
™
LX Panel will display the
fault message.
The Vyper
™
Logic Board generates this shutdown and
indicates that one of the low voltage power supplies for
the Vyper
™
Logic Board has dropped below the allowable
operating limits. The power supplies for the logic boards are
derived from the secondary of the 120 to 24 VAC transformer
which in turn is derived from the 480 to 120 VAC control
transformer. This message usually means that power to the
Vyper
™
was removed. If this was not the case, check the DC
voltage test points on the Vyper
™
Logic Board at TPC (+15V),
TPD (+10V), TPE (+5V), TPF (+7.5V) and TPG (-15V) with
respect to TPH (Ground). If any of these voltages are incor-
rect, replace the Vyper
™
Logic Board. This message normally
appears when the power is removed and reapplied.
Fault 33: Vyper Low DC Bus Voltage
Message
Quantum: “Fault 33”
Quantum LX: “VSD Low DC Bus Voltage Fault”
The DC link under voltage trip level must be set at 500 VDC
for 60 Hz and 414 VDC for 50 Hz VSD’s. If the DC link drops
below this level, the unit will trip.
If the DC link voltage drops below 500 VDC for 60 Hz, or 414
VDC for 50 Hz, the Vyper
™
Logic Board will initiate a system
shutdown. A common cause for this shutdown is a severe sag
in the AC line to the drive. Monitor the incoming three-phase
AC line for severe sags and also monitor the DC bus voltage
with a digital meter. If the AC line or the DC bus voltage is
not dropping, check the wiring and connections from the DC
bus to the Bus Voltage Isolator Board (wires 224, 225 and
226), and from this board to the Vyper
™
Logic Board (wires
221, 222 and 223). Also check the associated connectors.
Measure the voltage at J3 on the Vyper
™
Logic Board to verify
the voltage is getting to the board. If no problem is found,
try replacing the Bus Isolation board (031-01624) and the
Vyper
™
Logic board.
Fault 34: Vyper DC Bus Voltage Imbalance
Message
Quantum: “Fault 34”
Quantum LX: “DC Bus Voltage Imbalance Fault”
The one-half DC link voltage magnitude must remain within
± 88 VDC of the total DC link voltage divided by two for both
60 and 50 Hz VSD’s. If the Half DC link magnitude exceeds
the ± 88 volt window, the unit will trip and the Quantum
™
LX
displays message Fault 34.
The DC link is filtered by many large electrolytic capacitors
rated at 450 VDC. These capacitors are wired in series to
achieve a 900 VDC capability for the DC link. The voltage must
be shared equally from the junction of the center, or series
capacitor connection, to the negative bus and to the positive
bus. The center point is approximately half of the total DC link
voltage. When voltage is greater than ±88 VDC from the half
of the total DC link voltage, then this shutdown will occur.
Verify the operation of the DC bus voltage isolation board, and
all associated wiring to the Vyper
™
Logic Board. Many times
the actual bus voltage imbalance conditions are caused by
a shorted capacitor or a leaky or shorted IGBT transistor in
the power unit. In order to check for these conditions, apply
a 12 VDC source (such as a battery charger used to charge
automobile batteries) between the positive bus and negative
bus plates on power unit while measuring the voltage from
center to plus and center to minus. The bank causing the
imbalance will indicate unequal voltage readings.
Fault 35: Vyper High Internal Ambient Temperature
Message
Quantum: “Fault 35”
Quantum LX: “VSD High Internal Ambient Temp Fault”
The logic board contains a temperature sensor which moni-
tors the unit’s internal ambient temperature. The magnitude
of the unit’s internal temperature is compared to a limit of
145°F (63°C). If this limit is exceeded, the unit will trip and
the Quantum
™
LX panel will display Fault 35. The fan(s) and
coolant pump remain energized until the internal temperature
drops below 137°F (58°C). The fan(s) and water pump will
be de-energized when the internal temperature drops below
137°F (58°C).
Some potential causes for this shutdown are: internal Vyper™
fan failure, Vyper™ water pump failure or an entering con-
denser water temperature which exceeds the allowable limit
for the job. Additional causes for the shutdown include:
•
Plugged Heat Exchanger – The heat exchanger should be
cleaned once a year and back flushed.
• Low Condenser Flow – The Vyper
™
system requires 8 feet
of head across the heat exchanger to maintain adequate
GPM. If the head is less than 8 feet, correct the flow prob-
lem or add a booster pump.
Fault 36: Vyper High Inverter Baseplate Temperature
Message
Quantum: “Fault 36”
Quantum LX: “VSD High Inverter Baseplate Temp Fault”
A thermistor is located inside the IGBT Module on the Vyper
™
power unit. If this thermistor detects a temperature of 175°F
(79°C) or higher, a shutdown will occur. The cooling fans and
coolant pump on the Vyper
™
will continue to run after the
shutdown, until the thermistor temperature has dropped to
below 165°F (74°C). This shutdown requires a manual reset
button via the reset button on the Vyper
™
Logic board.
Fault 37: Vyper Logic Board Processor
Message
Quantum: “Fault 37”
Quantum LX: “VSD Logic Board Processor Fault”
This shutdown is generated if a communications problem
occurs between the two microprocessors on the Vyper
™
Logic Board. If this shutdown occurs, replace the Vyper
™
Logic board.
Fault 38: Vyper Run Signal
Message
Quantum: “Fault 38”
Quantum LX: “VSD Run signal Fault”
Upon receipt of either of the two run commands, a 5-second
timer will start. If the missing run signal is not asserted within
