www.miinet.com Moore Industries-International, Inc.
- 20 -
User’s Manual
225-748-00P
August 2024
Programmable RTD, T/C, Ohms, mV and Potentiometer Safety Trip Alarm
STA
TPRG
SECTION 3
Electrical Connections
Refer to Figure 3.4 for Sensor Hook-Up and Figure 3.3 for electrical connections.
When installing any Moore Industries product, always follow all local regulations and standards
for grounding, shielding, and safety.
Warning: Terminals on this unit may be connected to hazardous voltages. Before making ANY
connections to this unit, always remove power from the loop or instrument power terminals.
Installation Category
All terminals are rated CAT I.
Equipment Ratings
Contact Relays
The STA does not generate hazardous voltages but can switch outputs up to 3A at up to
250Vac or 30Vdc on its relay contacts. Products connected to the STA should be designed
to receive this type of input.
Analog Output
The STA does not generate hazardous voltages, its provides a low current (4-20mA) or
voltage (1-5V) input and a 4-20mA output. Products connected to the STA should be
designed to receive this type of input.
WARNING: If this unit is used in a manner not specified by Moore Industries, the protection
provided by the equipment may be impaired.
Switches and Circuit Breakers
For STA AC powered units, a switch or circuit breaker must be wired in series with the AC power
conductors. The switch or circuit breaker used must be located within three meters of the unit.
The circuit breaker or switch will only remove power to the unit, hazardous voltages may still be
connected to other terminals on the unit.
Power Supply Wiring
All power connections should be made with 14 or 16 AWG (2mm
2
or 1.3mm
2
) wire.
The end of each conductor should be stripped no more than 0.25in (7mm). The end of the
stripped wire should be tinned with solder, or inserted into a ferrule and crimped before being
placed into a terminal block.
Tighten the screws on the terminal block to 4.4 - 5.3 lbf/in
2
(0.5 - 0.6 N/m
2
).
Protective Earth Conductor
The Protective Earth Conductor shall be of equal or larger size wire than the other two power
conductors. The Protective Earth Conductor shall be the first conductor connected to the unit
when the unit is being wired. It shall be the last conductor removed when the unit is being
un-wired.
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