Johnson Controls Penn System 450 Series Technical Bulletin page 79

Term
Normally Open
(N.O.)
x
OEP
x
OFFS
x
OFFT
x
ONT
x
OSP
Definition
Normally Opened (N.O.) relay contacts are open when the relay is not
energized/activated and closed when the relay is energized. On System
450 Relay Outputs, the LCy and LNOy terminals connect to the Normally
Opened contacts. See Relay Outputs on page 18 for more information.
In the Percent Output Signal Strength at End Point Selection (OEP
screen in the Analog Output Setup screens, select the value (0 to 100%) of
the total signal strength, to be generated by analog output x when the
controlled condition is at the selected End Point (EP) value. See Direct and
Reverse Control Actions for Analog Outputs on page 20 and Setting up an
Analog Output on page 50 for more information.
In the Temperature Offset Selection (OFFS
screens, select the value (in degrees) that you want the measured (and
displayed) temperature value to differ from the actual sensed temperature
value. System 450 allows you to select a offset for each temperature sensor
in your System 450 control system. You cannot select an offset for
pressure or humidity sensors. The x value is the ID number for the
temperature sensor you are setting up (Sn-1, Sn-2, or Sn-3). See Setting Up
the Sensors and Transducers on page 45 for more information.
In the Minimum Off-Time Selection (OFFT
screens, select the number of seconds (0 to 300) that output relay x
remains Off after being driven Off by control loop conditions. The
minimum off-time feature is typically used to prevent short-cycling of
controlled equipment. See Setting up a Relay Output on page 47 for more
information.
In the Minimum On-Time Selection (ONT
screens, select the number of seconds (0 and 300 seconds) that relay
output x remains On after being driven On by control loop conditions. The
minimum on-time feature is typically used to prevent short-cycling of
controlled equipment. See Setting up a Relay Output on page 47 for more
information.
In the Percent Output Signal Strength at Setpoint Selection (OSP
in the Analog Output Setup screens, select the value (0 to 100%) of the
total signal strength, to be generated by analog output when the controlled
condition is at the selected Setpoint (SP) value. The x value is the ID
number for the output you are setting up. See Direct and Reverse Control
Actions for Analog Outputs on page 20 and Setting up an Analog Output
on page 50 for more information.
x
) screen in the Sensor Setup
x
) screen in the Relay Setup
x
) screen in the Relay Setup
x
)
x
) screen
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