Johnson Controls Frick vyper VYA PG -46 Service Manual page 53

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 their allowable limits,
the unit will trip and the Quantum
fault message.
The Vyper ™ Logic Board generates this shutdown, and it
indicates that one of the low voltage power supplies for
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the Vyper Logic Board has dropped below their 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. The 24 VAC input to the logic board can be
checked across wires 219 and 220 of the J5 connector of
the logic board. 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
+15, +5, +7.5, -15, +3.3 and +2.5 VDC with respect to TPH
(Ground). If any of these voltages are incorrect, 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
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VDC for 50 Hz, the Vyper
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
221, 222 and 223). Also check the associated connectors.
Measure the voltage at J3 on the Vyper
the voltage is getting to the board. If no problem is found,
try replacing the Bus Isolation board (031-01624) and the
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Vyper Logic board.
Fault 34: Vyper DC Bus Voltage Imbalance
Message
Quantum: "Fault 34"
Quantum LX: "DC Bus Voltage Imbalance Fault"
The 1/2 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 1/2 DC link magnitude exceeds the
± 88 volt window, the unit will trip and the Quantum
display the message Fault 34.
The DC link is fi ltered by many 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 ap-
proximately ½ of the total DC link voltage. If the voltage is
greater than ±88 VDC from the ½ of the total DC link voltage,
then this shutdown will occur.
First verify the operation of the DC bus voltage isolation
board, and all associated wiring to the Vyper
VYPER
™ LX Panel will display the
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Logic Board for the
Logic Board will initiate a system
™ Logic Board (wires
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Logic Board to verify
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LX will
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Logic Board.
VARIABLE SPEED DRIVE
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MAINTENANCE
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, connect a 12 VDC source (such as a battery
charger used to charge automobile batteries) and apply 12
VDC 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 that is causing the imbalance
will be evident via 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.
If this limit is exceeded the unit will trip and the Quantum
panel will display the Fault 35. The fan(s) and water pump
remain energized until the internal temperature drops below
137°F. The fan(s) and water pump will be de-energized when
the internal temperature drops below 137°F.
Some potential causes for this shutdown are: internal Vyper
fan failure, Vyper
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 fl ushed.
Low Condenser Flow – The Vyper
of pressure drop across the heat exchanger to maintain ad-
equate GPM. If the pressure drop is less than 8 feet, it will
be necessary to correct the fl ow problem or add a booster
pump.
Fault 36: Vyper High Inverter Base plate Temperature
Message
Quantum: "Fault 36"
Quantum LX: "VSD High Inverter Base plate Temp Fault"
A thermistor sensor is located inside the IGBT Module on
the Vyper ™ power unit. If at anytime 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
continue to run after the shutdown, until the thermistor tem-
perature has dropped to below 165°F (74°C). This shutdown
requires a manual reset via the Reset push button on the
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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"
S100-200 IOM (MAY 08)
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water pump failure or an entering con-
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system requires 8 feet
Page 53
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LX
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