VYPER
™
VARIABLE SPEED DRIVE
MAINTENANCE
S100-200 IOM (MAY 08)
Page 54
Upon receipt of either of the two run commands, a 5-second
timer will start. If the missing run signal is not asserted within
the 5-second window, the unit will trip and the Quantum
™
LX
panel will display the message Fault 38.
Redundant run signals are generated, one via wire #24 and
the second via the serial communications. Upon receipt of
either of the two run commands by the Vyper
™
Logic board,
a 5-second timer will begin. If the missing run command is
not received within the 5-second window, the Vyper
™
will shut
down and the Quantum
™
LX Panel will display the shutdown
message. This shutdown could occur if there is a problem with
the wiring between the Quantum
™
LX panel and the Vyper
™
Logic board. Check the #24 to #25 horseshoe jumper in the
Quantum
™
LX panel, and all other wiring involved in energiz-
ing #24 in the Vyper
™
cabinet. Also check to ensure that the
serial communications wiring between the micro board and
the Interface board, and Vyper
™
Logic board and the Interface
board are connected properly.
Fault 39: Vyper High Converter Heat Sink Temperature
Message
Quantum: “Fault 39”
Quantum LX: “VSD High Converter Heat Sink Temp Fault”
A thermistor sensor is located behind the last SCR/Diode
block on the copper chill plate of the Vyper
™
Power Unit. If at
anytime this thermistor detects a temperature of 170°F (76°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 160°F
(71°C). This shutdown requires a manual reset via the Reset
push button on the Vyper
™
Logic board.
Fault 40: Vyper Invalid Current Scale Selection
Message
Quantum: “Fault 40”
Quantum LX: “VSD Invalid Current Scale Selection Fault”
The J1 connector on the Vyper
™
Logic board contains jump-
ers along with wires from the output CTs. Since the part
number of the Logic board is the same on all horsepower
sizes, the jumpers tell the logic board the size of the Vyper
™
being employed in order to properly scale the output current.
If the jumper confi guration is found by the Logic board to be
invalid, the system will be shut down and the above message,
Fault 40, will be generated. The proper jumper confi guration
is shown on the wiring label for the Vyper
™
.
Fault 41: Vyper Low Inverter Base plate Temperature
Message
Quantum: “Fault 41”
Quantum
™
LX: “VSD Low Inverter Base plate Temp Fault”
The phase bank assembly heatsink temperature and the in-
verter module base plate temperature are compared to a lower
limit of 37°F. If the inverter module base plate temperature falls
below this limit the unit will trip and the Quantum
™
LX Panel will
display the message Fault 41. In addition, if both the inverter
and converter temperatures fall below the 37°F limit, the unit
will trip and the fan(s) and water pump will be energized. This
feature provides the Service Dept. with a means to run the
water pump while fi lling the cooling system (by pulling Vyper
™
logic board plug P2). In most case the problem will be broken
wiring or an open thermistor. Check the circuit for continuity at
Vyper
™
Logic board plug J2. Also make certain that one side
of the circuit is not shorted to the enclosure.
Fault 42: Vyperdrive - Serial Communication
Message
Quantum: “Fault 42”
Quantum LX: “VSD Serial Communications Fault”
When requesting Status data, the response data from the
Vyper
™
includes a bit that indicates whether communications
were lost from the Frick Interface Board to the Vyper
™
. If this
bit is high for 22 consecutive seconds, this fault occurs. This
fault also occurs whenever a receive, timeout, or checksum
fault is detected on the Vyper
™
communications, for twenty
continuous seconds. While this fault is active, the Frick In-
terface Board will send Initialize data requests in order to
reestablish the communications link. All serial input data is
also cleared.
This message is generated when communications between
the Quantum
™
LX Panel and the Frick Interface board, or the
Frick Interface board and Vyper
™
Logic board is disrupted
for a least 22 seconds. Check the shielded cable between
J11 on the Vyper
™
Logic board and J8 on the Frick Interface
board. Check for continuity and also check to see that none
of the conductors are shorted together or shorted to ground.
The terminal block in the lower left corner of the Vyper
™
cabinet serves as a junction point for this cable, and it is
possible for strands of wire to bridge across the terminals at
this location. If all wiring is intact, this problem may also be
caused by electrical noise. Ensure that the chiller and the
Quantum
™
LX Panel are properly ground through the Vyper
™
.
Make certain the shield for this cable is tied to chassis ground
at the Quantum
™
LX panel end only via a green chassis
ground screw. The shield should not go to ground through the
Frick Interface board. If all of this has been done and com-
munications cannot be established, even at power-up, you
may have a bad communications driver on either the Vyper
™
Logic or the Frick Interface boards. Change out both the Frick
Interface and Vyper
™
Logic boards. If the Serial Receive fault
problem only occurs intermittently during times when the unit
is running, the culprit could be electrical noise.
If the Harmonic Filter is installed then the fault can be gener-
ated when the communications between the Vyper
™
Logic
board and the Harmonic Filter Logic board, or the Harmonic
Filter Logic board and the Frick Interface board is disrupted.
Also check J8 on the fi lter logic board and J9 on the Frick
Interface board. Repeat the above procedure for the Vyper
™
serial cable on the Harmonic Filter serial cable.
Fault 43: Vyper
™
Precharge Lockout
Message
Quantum: “Fault 43”
Quantum LX: “VSD Precharge Lockout”
If the Vyper
™
fails to meet the precharge criteria (refer to
precharge faults below), then the precharge circuit will wait
for a period of 10 seconds. During this time, the unit’s cool-
ing fans and coolant pump remain energized in order to cool
the input SCR’s. Following this 10-second cool-down period,
precharge will again be initiated. The unit will attempt to meet
the precharge criteria three consecutive times. If the Vyper
™
fails to meet the precharge criteria on three consecutive tries,
the Vyper
™
will shut down, lock out, and display this mes-
sage. In order to initiate precharge again, the Quantum
™
LX
panel’s compressor switch must fi rst be placed into the
STOP/RESET position.
