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