Specifications

Page 17–10
FOCUS System Manual
17.4 Specifications
The Pilot Wire Interface Module’s technical spec-
ifications are shown in Table 17-1.
17.4.1 Status Indicators
This module has five status indicators, as shown
in Figure 17-13. The red/green status LED is
green if the module is functional and red if the
module is non-functional. If you have a three-
terminal system, the status LED also tells you
when there is a connection or mapping problem. It
turns red to indicate one of the following situa-
tions:
1) At least one HCB Module is attached to a
3-terminal rear interface and it cannot
communicate with the interface’s other
module for one of the following reasons:
•The interface was attached while the
chassis was locked (you must always
unlock the chassis before installing a
module or a rear interface module)
• The other HCB module is not installed
(i.e., only one HCB module is attached to
the 3-terminal rear interface module)
•The two HCB modules have different
firmware versions (they must have the
same firmware version to properly
communicate)
2) After the two modules and the 3-terminal
rear interface are installed and configured
and the chassis locked, the modules are
replaced with other HCB Modules that
have a different firmware version.
3) After the two modules and the 3-terminal
rear interface are installed and configured
and the chassis locked, the 3-terminal rear
interface is removed.
Figure 17–13. Pilot Wire Interface Module Status
Indicators.
4) The chassis is locked after the two HCB
Modules are installed, but before the
3-terminal rear interface is attached.
When the status LED turns red, you can quickly
determine whether it is reporting a “BAD” module
or one of the “3-terminal” error conditions by
performing the channel module status check (see
“Channel Modules Status” in Chapter 4). If the
“Channel Modules Status” reports the module is
“GOOD” but the status LED is red, the problem
must be one of the “3-terminal” error conditions
listed above.
The remaining four LEDs, beginning at the top
left, work as follows:
KEY – This green LED, when lit, indicates that
the transfer trip function is being keyed at this
terminal.
TRIP – This green LED, when lit, indicates that a
transfer trip request is being received at this
terminal.
ALARM – This red LED, when lit, indicates loss
of channel (i.e., that no signal is being received
from another Pilot Wire Interface Module at the
other line terminal).