The Interface Solution Experts
37
SPA
Site-Programmable Volt &
Milliamp Limit Alarm Trips
Operation
Once connected to sensors, annunciators (or other
discrete devices), and appropriate power, the SPA be-
gins to function according to its internal switch settings
and the configuration stored in its non-volatile internal
memory.
Configuration data, stored in memory, is monitored
continuously. Changes can be made at any time. Any
changes made to operating parameters controlled by
choices made in the SPA menu system take effect im-
mediately.
The settings of the internal DIP switches and security
jumper may also be changed at any time. Changes to
the security jumper setting, however, do not take effect
until unit power is cycled off and on.
The settings for failsafe/non-failsafe and source/sink
(see Figures 3 and 4, respectively), once made, take
effect right away.
LEDs
There are at least three, and as many as six LEDs
on the front panel of the SPA. Each is labeled, and
provides a quick reference for input condition during
normal unit operations.
• READY
This LED shows green during normal
operation. Green indicates that the SPA has run its
startup diagnostic and that all internal circuitry is
functioning properly.
The LED goes out if internal errors occur.
• INPUT
This LED shows green during normal
operation. Green indicates that an input sensor or
sensors has/have been connected, and that they
are functioning properly.
• TRIP #
These LEDs, one per installed relay, show
green when the connected input is in a non-alarm
condition relative to the trip point setting. A red
LED indicates alarm.
NOTE:
The state of the SPA relays in alarm or non-
alarm is determined by the failsafe/non-failsafe
setting of the unit’s internal DIP switches
(see Figure 3, earlier in this manual). Do not
confuse the state of the LED with the state of
its associated relay.
Failsafe relays are ON (energized) when input
is in a non-alarm condition (green LED), OFF
(de-energized) in alarm (red LED).
Non-failsafe relays are ON (energized) when
input is in an alarm condition (red LED), OFF
(de-energized) in non-alarm (green LED).
This design scheme means that the LEDs associated
with relays will always show red when the correspond-
ing input is in an alarm condition, green in non-alarm.
Manual Reset
There are two connections labeled “MR” on the
SPA top terminal block. These terminals work in
conjunction with the latching/non-latching alarm
function.
When an SPA is configured with latching alarms (refer
to the description of the “CONF ALRM” menu, earlier
in this manual), an alarm condition will not “clear”,
that is, the relay will not change state, until the input
returns to a non-alarm state AND these manual reset
terminals are shorted.
Shorting the MR terminals “clears” all alarms.
