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Chapter Five: Type R7xxC Relay System
General Information
53
Trip Point Direction
The trip point polarity, or direction, defines the direction of pressure change that will energize the
hardware trip points; each relay functions independently. The trip point direction is controlled by
jumpers on the PC board inside of the Relay Module. You can change the direction for either trip
point by adjusting the appropriate jumper setting on the PC board (refer to
How To Configure the
Trip Points
, page 60, for more information).
The initial direction for Trip Point A is “low”; the trip point is energized as the pressure falls
below
the specified trip point level. The trip point is not deenergized until the pressure rises
above the value defined by the Trip Point A hysteresis, as shown in Figure 14.
Figure 14: Trip Point Direction Set Low
The initial direction for Trip Point B is “high”; the trip point is energized as the pressure rises
above
the specified trip point level. The trip point is not deenergized until the pressure falls
below the value defined by the Trip Point B hysteresis, as shown in Figure 15.
Figure 15: Trip Point Direction Set High
Pressure
TRIP POINT
HYSTERESIS
TRIP POINT
VALUE
Trip Point
Condition
Trip Point
De-energized
Trip Point
Delay
Trip Point
Energized
Pressure
TRIP POINT
HYSTERESIS
TRIP POINT
VALUE
Trip Point
Condition
Trip Point
De-energized
Trip Point
Delay
Trip Point
Energized
Summary of Contents for Baratron 740C
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