YVAA Style A Air-Cooled Screw Liquid Chillers ... - Johnson Controls

FORM 201.28-NM1.1
ISSUE DATE: 8/29/2012
General
VSD
DATA KEY
The VSD DATA key provides the user with displays of
VSD temperatures, voltages, currents, and other operating
data. This key has multiple displays, which can
be seen by repeatedly pressing the VSD DATA or the
▲ or ▼ (Arrow) keys. An explanation of each message
is provided below.
VSD Data Key Operation
The first VSD DATA key press displays the actual VSD
Output Frequency and Command Frequency.
VSD FREQUENCY ACTUAL = XXX.X HZ
COMMAND = XXX.X HZ
The second key press of the VSD DATA key or the ▼
(ARROW) key displays the calculated compressor %
FLA and measured motor currents in amps for systems
1 and 2. When measuring motor current keep in mind
that measuring inverter PWM current is difficult and
meter error can be significant.
VSD COMP 1 = XXX AMPS = XXX %FLA
COMP 2 = XXX AMPS = XXX %FLA
The next key press displays the current limit values
set locally on the panel under the PROGRAM key, remotely
by an ISN, and remotely by the Current Limit
input. Any current limits that are inactive will display
“XXX” instead of a numeric value.
VSD CURRENT LIMIT LOCAL = XXX %FLA
ISN = XXX REMOTE = XXX %FLA
VSD DATA KEY
SECTION 8 - MICROPANEL
JOHNSON CONTROLS 103
LD10605
The next key press displays DC Bus voltage.
VSD DC BUS VOLTAGE = XXX VDC
The next key press displays the Control Panel/VSD Internal
Ambient Temperature and VSD Cooling Pump/
Fan Status. YYY will indicate ON or OFF.
VSD INTERNAL AMBIENT TEMP = XXX.X °F
COOLING SYSTEM STATUS = YYY
The next key press displays the IGBT highest baseplate
temperature.
VSD IGBT BASEPLATE TEMPS T1 = XXX °F
T2 = XXX °F
The next key press displays the state of the Precharge
signal, where XXX is either ON or OFF.
VSD PRECHARGE SIGNAL = XXX
The next key press displays the setting of the VSD’s
105% FLA overload potentiometer for Compressor #1
and 2. The settings are determined by the adjustment of
the overload potentiometers on the VSD Logic Board.
These pots are factory set and should not require changing
unless the circuit board is replaced.
VSD COMP 1 MOTOR OVERLOAD = XXX AMPS
COMP 2 MOTOR OVERLOAD = XXX AMPS
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