Johnson Controls YORK OPTIVIEW YK Series Service Instructions Manual page 108

SECTION 12 - SOLID STATE STARTERS
munications until successful. Also, at power-up, the
Logic/Trigger Board reads wire jumpers in its connec-
tor J1 to determine the LCSSS model applied (Refer to
Solid State Starter (Mod B) – Operation and Mainte-
nance (Form 160.00-O2). If an invalid jumper configu-
ration is read, the Logic/trigger Board initiates a cycling
shutdown and LCSSS - INVALID CURRENT SCALE
SELECTION is displayed on the System Details line
of the OptiView™ Control Center Display. The model
designation is transmitted to the microboard for display
on the MOTOR Screen. This designation determines the
allowable range for the Full Load Amps (FLA) setpoint
and Start Current setpoint. There are 4 LCSSS models:
7L, 14L, 26L and 33L. Each model has an allowable
Full Load Amps (FLA) range and Start Current range as
listed later in this section.
Communications between the microboard and Logic/
Trigger Board are in the form of master/slave. The mi-
croboard is the master and the Logic/Trigger Board is
the slave. The Logic/Trigger Board sends two types of
data to the microboard, Status data and Fault data.
After successful initialization, the microboard sends a
data request every 2 seconds. Normally, the Logic/Trig-
ger Board responds to each request. However, if the mi-
croboard does not receive a response to 10 consecutive
requests, the microboard initiates a cycling shutdown
and displays LCSSS - SERIAL COMMUNICATIONS
on the System Details line of the OptiView™ Control
Center display. In addition, the Logic/Trigger Board will
initiate the same cycling shutdown if it does not receive
a data request from the microboard after 10 successive
attempts to send data.
Prior to June 2006, new production chillers are
equipped with Microboard 031-01730- 000 (early vin-
tage) or 031-02430-000 (later vintage). The COM5
(J15) serial port on these boards communicates with
the Starter Logic/Trigger Board 031-02001 (TB2) us-
ing YORK protocol. Refer to Figure 48 on Page 111.
After June 2006, Microboard 031-02430-001 is supplied
in new production chillers. Until March 2007, the COM 5
(J15) serial port of this board communicates with Logic/
Trigger Board 031-02001 (TB2) using YORK protocol.
Refer to Figure 48 on Page 111. After March 2007,
this Logic/Trigger Board is replaced with 031-02505 in
new production chillers. YORK protocol is used until
mid 2008 (Refer to Figure 49 on Page 111).
On new production chillers after mid 2008, Microboard
031-02430-001 COM 2 (J13) serial port communicates
with Logic/Trigger Board 031-02505 (J14) using RS-
108
485 Modbus protocol (Refer to Figure 50 on Page
112). This configuration requires Software version
C.OPT.01.18.307 (or later). When using COM 2 serial
port for starter communications, Microboard Program
Jumper JP17 must be placed on pins 1 and 2. On the
SETUP Screen, the COM 2 serial port is enabled by
setting the Motor Communications Protocol setpoint
to Modbus. The Motor Node ID setpoint must be set
to "1" to match the Modbus Address assigned to the
starter. The Modbus Address is set to "1" in the starter
by placing Logic/Trigger Board switch SW1 position
1 to ON; all other positions to OFF. If the Motor Node
ID does not match the Modbus Address assigned to the
Logic/Trigger Board, the Logic/Trigger Board will not
communicate with the microboard.
After June 2006, Microboard 031-02430-001 is sup-
plied as service replacement for all previous Mi-
croboards. To allow it to be backward compatible to
all existing chillers, this board contains both the COM
5 opto-coupled YORK protocol serial port (J15) and
the COM 2 RS-485 Modbus serial port (J13). Refer to
Figure 48 on Page 111, Figure 49 on Page 111, and
Figure 50 on Page 112.
After March 2007, Logic/Trigger Board 031-02505 is
supplied as service replacement for all previous Logic/
Trigger Boards. To allow it to be backward compat-
ible to all existing chillers, this board contains both an
opto-coupled YORK protocol serial port (TB2) and a
RS-485 Modbus serial port (J14). Refer to Figure 48
on Page 111, Figure 49 on Page 111, and Figure 50
on Page 112.
Anytime the Logic/Trigger Board initiates a Cycling or
Safety shutdown, it opens its STOP contacts that are con-
nected in series with the OptiView™ Control Center's
1R (K18) RUN relay coil. The contacts remain open as
long as the condition exists. The open STOP contacts
interrupt the circuit to 1R causing it to de-energize, re-
moving the run signal to the LCSSS. Simultaneously,
the microboard reads the opening of the LCSSS STOP
contacts via the I/O Board J2- 1. This signals the mi-
croboard that the LCSSS has initiated a shutdown. The
Logic/Trigger Board sends the cause of the shutdown in
response to the next data request. This is logged on the
HISTORY Screen as the LAST FAULT WHILE RUN-
NING. A snapshot of the LCSSS operating parameters
valid at the instant of the fault are also sent. Any addi-
tional faults that occur within the 2 second transmission
time are also sent and logged on the HISTORY Screen
under LAST TEN FAULTS. Refer to Operation Manual
(Form 160.54-O1) for description of all Cycling and
Safety shutdown messages.
FORM 160.54-M1
JOHNSON CONTROLS