TT8900 OPT
–
Installation and Service Manual
Page 21 of 41
Example 1: Having the following external connections will result in a label
filled in like the one depicted in
Figure 11
- Example 1.
»
Forecourt Controller (RS232) on channel 1, connectors
S41-S43
.
»
ATG (RS485) on channel 2, connectors
S11-S13
.
»
Price Sign (RS232) on channel 3, connectors
S31-S33
.
»
Wayne Interface (RS485) on channel 4, connectors
F11-F13
.
Example 2: Having the following external connections will result in a label
filled in like the one depicted in
Figure 12
- Example 2.
»
Forecourt Controller (RS232) on channel 1, connectors
S21-S23
.
»
POS (RS232) on channel 2, connectors
S41-S43
.
»
ATG (RS232) on channel 3, connectors
S31-S33
.
»
Price Sign (RS485) on channel 4, connectors
S11-S13
.
»
NZPP Interface on channel 6, connectors
F21-F23
.
Remember: The Power Supply, Emergency Stop Interface and the LED lights are always
connected through
1-3
,
I1-I3
and
O1-O3
, respectively.
2.15
Description of Emergency Stop Interface
Australian Standard AS 1940 requires that any unsupervised self-service refuelling facility has
an emergency shut-down system that must disconnect power to the fuel dispensers and
transmit an alarm to a person or organisation capable of responding to this event (refer to AS
1940-2004 Clause 7.3.5). To facilitate compliance with this requirement, the OPT has an
interface (SL7V5) which must be connected to a normally closed voltage free contact that opens
when the emergency shut-down system activates. This will cause the OPT to generate an alert
event which will in turn relay the alarm to the appropriate person or organisation via the T-
ALERT service. If power is disconnected to the OPT as well, as a result of the emergency stop
system activating, then the event notification will still occur as the OPT will continue to run from
its UPS. Due to the significant variations in power supply wiring networks used in refuelling
facilities, it is difficult to give complete information on how the OPT should be interfaced with
the on-site emergency stop control system.
One possible solution is that the OPT interface be connected to a separate normally closed
pole/switch module that is integrated into the main emergency stop push button switch as
shown below.
Note: The OPT comes from the factory with a red shorting link on the SL7V5 connection
between the L1 and L2 contacts which must be removed prior to making this connection. The
AS 1920-2004 Clause 7.3.5 also has some requirements for the type and location of the
switch.
Figure 11: TT8900 OPT External
Connections Label Example 1
Figure 12: TT8900 OPT External
Connections Label Example 2
