Johnson Controls Frick Vyper 305/254 Horsepower, Manual, Page: 50 / 72

VYPER ™ VARIABLE SPEED DRIVE
OPERATION
100.200-IOM (SEP 13)
Page 50
This control strategy is a variation on the generic control
strategy shown previously. Not all applications require or are
suitable for the very low speeds obtainable by the Vyper ™
drive. Many times the motor is the limiting factor as it may
not be suitable for 20% speed but is capable of 50% speed.
For these applications, the settings within the Quantum ™ LX
can assure that the motor never runs slower than the allow-
able minimum speed.
NOTICE
The Variable Speed Minimum Slide Valve Position of
25% is a factory default value based on the minimum
slide valve position at 50% speed.
VSD LOGIC BOARD SETUP
The VSD logic board is equipped with a set of eight (8) DIP
switches ( SW3), 1, that configure the RS-485 communica -
tion between the logic board and Quantum ™ LX Panel as
well as the optional harmonic filter board. The logic board
is mounted inside the Vyper ™ cabinet. Refer to Figure 55.
The first seven switches in SW3 configure MODBUS com-
munication address with the Quantum
™
LX Panel. To config-
ure the switches for proper communication, set switches 1
through 6 to the “OFF” position. Place switch 7 in the “ON”
position. The resulting MODBUS address is “0x40”. Refer
to Figure 55.
Figure 55 - Vyper Logic Board
Switch 8 on SW3 allows harmonic filter communication.
Verify switch 8 is in the “ON” position to allow proper com-
munication. Refer to Figure 56.
Figure 56 - Logic Board SW3
In addition to the eight DIP switches on SW3, jumper JP3
must be installed in order for Vyper ™ control to be set at
‘Refrigeration’ mode. Refer to callout 1 on Figure 57 for the
location of JP3 on the logic board.
Figure 57 - Vyper Logic Board
There is also a DIP switch to select 60Hz or 50Hz, depending
on the application. Ensure that it is properly set. See callout
2 on Figure 57.
SETTING THE JOB FLA
The final item for setup of the Vyper
™
is adjusting the Job
FLA via trim pot on the Vyper
™
Logic board. The trim pot
sets a value for the Job Full Load Amps (FLA). The adjust-
ment is performed at two locations; the first is the trim pot
on the logic board mounted on the right door of the Vyper
™
cabinet. See Figure 58.
Figure 58 - Logic Board Inside Right Cabinet Door