VYPER
™
VARIABLE SPEED DRIVE
MAINTENANCE
100-200 IOM (FEB 09)
Page 57
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 filter 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 first be placed into the
STOP/RESET position.
Fault 44: Vyper
™
low Converter Heat Sink Temperature
Message
Quantum: “Fault 44”
Quantum LX: “VSD Low Converter Heatsink Temp Fault”
The phase bank assembly heatsink temperature and the
inverter module base plate temperature are compared to
a lower limit of 37°F. If the inverter base plate temperature
or the converter heat sink temperature falls below 37°F,
the message displayed will be Fault 44. In addition, if both
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 filling the cooling system (by pulling VSD logic
board plug P2).
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 37°F (3°C)
or lower a shutdown will occur. In most cases, the problem
will actually be an open thermistor or broken wiring to the
thermistor. The normal thermistor resistance is 10K ohms at
77°F (25°C). Check the circuit for continuity at Vyper
™
Logic
board plug J2. Also, make certain one side of the circuit is
not shorted to the cabinet. Sometimes a thermistor wire can
be pinched against the enclosure.
Fault 45: Vyper low Current Imbalance
Message
Quantum: “Fault 45”
Quantum LX: “VSD Current Imbalance Fault”
When the average of the three output phase currents (see
section 10.1) exceeds 80% of the 100% Job FLA (see sec-
tion 13.1.6), the % Output Current Imbalance is calculated
using the following equation: [ (
I
a
-I
ave
) + (
I
b
-I
ave
)
+
(
I
c
-I
ave
)
/ {2}{I
ave
}] [100]: I
ave
= {I
a
+ I
b
+ I
c
}/3. If the % Imbal-
ance exceeds 30% continuously for 45 seconds the unit shall
trip and the Quantum
™
LX panel shall display the message
Fault 45. The imbalance fault is disabled when the average
of the three output phase currents drops below 80% FLA.
Fault 46: Vyper Precharge – DC Bus Voltage Imbalance
Message
Quantum: “Fault 46”
Quantum LX: “VSD Precharge DC Bus Voltage Imbalance”
The 1/2 DC link voltage magnitude will remain within
± 88VDC of the total DC link voltage divided by two during
the precharge interval for both the 60 and 50 Hz VSD’s. If not,
the Quantum
™
LX panel will display the message Fault 46.
The definition for this fault is identical to “ VSD - DC Bus Volt-
age Imbalance”, except that the fault has occurred during the
precharge period which begins during prelube.
Fault 47: Vyper Precharge – low DC Bus Voltage 2
Message
Quantum: “Fault 47”
Quantum LX: “VSD Precharge Low DC Bus Voltage 2”
The DC link voltage will reach at least 500 VDC within 20
seconds after the precharge signal has been asserted on
the 60 Hz VSD and at least 414 VDC within 20 seconds on
the 50 Hz VSD. If not, the Quantum
™
LX panel will display
the message Fault 47.
The unit is shut down and this message is generated if this
condition is not met. If this shutdown occurs, measure the
bus voltage at the laminated bus structure, verify the wiring
between the Vyper
™
Logic board and Quantum
™
LX Vyper
™
trigger board, and the input SCR’s, and the DC bus isolator
board and the Vyper
™
Logic board.
Fault 48: Vyper Precharge – low DC Bus Voltage 1
Message
Quantum: “Fault 48”
Quantum LX: “VSD Precharge Low DC Bus Voltage 1”
The DC Bus voltage must be equal to or greater than 50 VDC
for 60 Hz (41 VDC for 50 HZ) 4 seconds after precharge has
begun. The unit is shut down and this message is generated
if this condition is not met. If this shutdown occurs, measure
the bus voltage at the laminated bus structure, verify the
wiring between the Vyper
™
Logic board and Quantum
™
LX
Vyper
™
trigger board, and the input SCR’s, and the DC bus
isolator board and the Vyper
™
Logic board.