6 The Interface Solution Experts
STA
Programmable Current/Voltage
Safety Trip Alarm
Introduction
This is the user’s manual for Moore Industries’ STA
(HLPRG): Programmable Current/Voltage Safety Trip
Alarm.
The Moore Industries’ Safety Trip Alarm (STA) is
designed and manufactured to provide a high level of
availability for safety critical applications and for use
as a component part of a safety instrumented system.
This manual contains all of the information needed to
configure, install, operate and maintain this product.
When the STA is used in a SIL rated safety application
(as defined by IEC 61508), the Safety Instrumented
Systems section of this manual must be read and
followed in order for the STA to meet it’s IEC 61508
certification requirements.
About this Manual
Wherever you see a “Note”, “Caution” or “WARNING”
pay particular attention.
WARNING - Hazardous procedure or condition that
could injure the operator.
Caution - Hazardous procedure or condition that
could damage or destroy the unit.
Note - Information that is helpful for a procedure,
condition, or operation of the unit.
Model and Serial Numbers
Moore Industries uses a system of model and serial
numbers to keep track of all of the information on
every unit it sells and services. If a problem occurs
with your STA, check for a tag affixed to the unit
listing these numbers. Supply the Customer Support
representative with this information when calling.
STA Description
Moore Industries’ STA (HLPRG) is a programmable
current/voltage safety trip alarm.
The STA monitors a process variable and provides
two fully user-configurable contact closure outputs
that can be individually programmed to trip whenever
the input falls outside a user-set, high or low trip point.
It also has one fault alarm output which is triggered by
a self-diagnosed failure of the input or the STA itself.
The STA is typically used to activate a warning light,
bell or buzzer; or to initiate a system shutdown. Thus,
the instrument acts as a simple, but highly reliable and
effective means of monitoring and safe-guarding a
process.
The STA is configured using front panel push
buttons and a configuration can also be saved and
downloaded using the PC transfer utility. A large
5-digit display shows menu prompts during push
button configuration and process variable and status
messages during normal operation.
Inputs
The STA (HLPRG) supports either current inputs from
0-50mA (1mA minimum span) or voltage inputs from
0-10V (250mV minimum span). These inputs can be
trimmed and scaled, refer to the Configuring Inputs
section of this manual for additional information.
TX Power
A transmitter excitation power supply (24Vdc
±10%@24mA) is standard on the STA (HLPRG). You
may access this externally at the terminals shown in
Figure 5.
Alarms
The STA has three (-3PRG) contact closure alarms.
One relay is factory configured as a Fault alarm and
the remaining two relays are user-configurable Trip
alarms. A dual color LED (Red/Green) is provided
with each alarm to indicate its condition.
The fault alarm trips on a self-diagnosed failure
within the STA or on any of its inputs. This alarm is
latching and has to be reset by the user. Only user
configuration faults will clear automatically once the
configuration is valid. Input faults can be cleared by
the “RESET FAULT” menu, and self-diagnosed faults
can only be cleared by power cycling the unit. For
more information refer to the Diagnostics and Fault
Alarm section.
The Trip alarms are configurable for high or low trip
with an adjustable dead band. These alarms can be
latching or non-latching. Latched alarms are reset
through the Manual Reset (MR) terminals.
