Johnson Controls Frick Vyper 305/254 Horsepower, Руководство пользователя, Страница: 56 / 72

VYPER ™ VARIABLE SPEED DRIVE
MAINTENANCE
100.200-IOM (SEP 13)
Page 56
When is a booster pump required on a Vyper ™ compres-
sor drive?
The Frick Vyper
™
requires 8 ft of head for proper coolant
flow (water or glycol) to the heat exchanger. If this amount
of head is not available, then a booster pump is required.
The pink color of the coolant has faded. Is there a
problem?
The coolant normally has a pink or rosy color when new.
After months of operation, this color may dissipate, and the
coolant may appear almost colorless. The lack of color in
the coolant does not necessarily indicate a problem. Most
colorless samples test above 1000 PPM nitrite, which is nor-
mal. There is no need to flush the system unless the coolant
becomes opaque or cloudy. If this is the case, please obtain
a sample for analysis, then flush the system with coolant and
install fresh coolant. Be aware that cloudy coolant may con-
tain bacteria. Please use adequate preventative procedures
to avoid contamination. The coolant must be charged every
year regardless of color.
Why is the Vyper
™
circuit breaker tripping?
Circuit breaker tripping is normal for a failed Vyper ™ drive.
The unit does not have input fuses. The AC choke now re-
duces the current flowing to the short, and the circuit breaker
is fast enough to provide proper protection. A tripped circuit
breaker may be due to a shorted condition inside the drive,
the presence of a ground fault condition, or due to the
breaker itself being faulty. Check for shorts at the input and
output of the drive. Check for leakage current to ground. If
none is found, try raising the adjustable thresholds on the
breaker, and if it still trips, it is likely defective.
What is the test button on the Vyper
™
logic board?
When the Vyper ™ is not running, this button may be used
to test operation of the logic outputs to the Vyper ™ power
module, as well as the operation of the gate driver board on
the IGBT module. When the button is depressed, six output
LEDs on the Logic Board alternately light the three plus (+)
LEDs then the three (-) LEDs. At the same time, six LEDs on
the gate driver board will alternate between dim and bright
intensity. Several conditions can inhibit this test function:
• If any VSD fault exists.
• If the unit is in precharge.
• If the
SCR trigger is enabled.
• If the VSD unit is running.
• A 4-minute timer is part of this function to ensure that the
DC Link Voltage is discharged to a safe level. This timer
must time out before the Test Button will function.
ADDENDUM
The following materials provide additional information for
operation and functioning of the Frick Vyper
™
variable speed
drive. Strongly recommended is the Frick Quantum
™
LX Com-
pressor Control Panel Operations Manual, which explains
all the Vyper
™
screens that are not covered in this manual.
In addition to this manual it is strongly recommended that
you have the Installation Operation and Maintenance manual
to the specific refrigeration system which will be controlled
by the Frick Vyper
™
.
VYPER
™
ALARMS / SHUTDOWNS
In addition to the Alarms and Shutdowns that the Quantum ™ LX
software generates for the basic compressor package,
there are warnings and shutdowns that are associated
with the Vyper ™ drive operation. These can be initiated by
the Quantum ™ LX panel or the Vyper ™ drive. The following
pages describe these warnings and shutdowns by title and
description as well as the cause and items to check. When a
Shutdown occurs, the display backlight will flash on and off
to alert an operator of the shutdown. This visual alarm will
help get the attention of the operator in a noisy engine room
environment where audible alarms may not be heard. Pressing
any key on the keypad will clear the flashing backlight alarm.
The FRICK VYPER ™ FAULT CODES table shows the full listing
of fault codes. A detailed description and troubleshooting
recommendations follow.
The following warnings and or shutdowns are initiated by the
Quantum ™ LX panel. These safeties are set for When Running:
High Motor Stator Temp. – If the motor stator temperature
rises above a critical point, one or more embedded thermistors
will open, removing the digital input to the Dig. Aux. #1 mod-
ule, wire #28 (typical). There is one thermistor per winding.
If the motor is equipped with stator RTDs (one per winding)
the same result will occur only that the signal is now an ana-
log signal and is set up as one of the PHD monitoring chan-
nels. The warning and shutdown values can be seen on the
PHD setpoints screen of the Quantum
™
LX panel and should
be set based on the limits of the motor’s insulation class.
Blower Motor Aux. – If the motor is equipped with auxiliary
blowers mounted to the top of the main drive motor, then a
confirmed run signal is required. This signal is in the form of
a digital signal from the Aux. Contacts of the blower motor
starter/s and is received by Dig. Aux. #2, wire #29 (typical).
High Vyper Coolant Temp. – The Vyper Coolant Temp. is
monitored by the Quantum ™ LX Panel from a temperature
probe mounted at the coolant reservoir on analog auxiliary
#9 (Ch. 13 analog brd #2). If the Vyper ™ Coolant exceeds the
High Temp Warning or Shutdown values for the delays, this
warning or shutdown will occur. These values can be seen
on page 2 of the Analog Auxiliaries setpoints screens. Default
settings are 130°F for the warning, 135°F for the shutdown.
Low Vyper Coolant Temp. – The Vyper Coolant Temp. is
monitored by the Quantum ™ LX Panel from a temperature
probe mounted at the coolant reservoir on analog auxiliary
#9 (Ch. 13 analog brd #2). If the Vyper Coolant exceeds the
Low Temp Warning or Shutdown values for the delays, this
warning or shutdown will occur. These values can be seen
on page 2 of the Analog Auxiliaries setpoints screens. Default
settings are 85°F for the warning, 80°F for the shutdown.
NOTICE
If the compressor has been down for an extended period
and the ambient temperature is less than the Low Vyper
Coolant Temp. warning or shutdown values, it may be
necessary to lower these settings temporarily in order
to get the drive running.
WARNING
This setpoint can never be set lower than 5°F above
ambient dry bulb temperature. If not sure of dry bulb
temperature, DO NOT GUESS.
Once the drive is running with the coolant temperature back
above the default setting for this safety, go back and change
them to 85°F for the warning and 80°F for the shutdown.