Relay Setpoint Characteristics (Setpoint Assigned To Vacuum System Pressure) - Instrutech Busy Bee PCM301 User Manual

Instruction Manual PCM301 Busy Bee

4.4.1 Relay setpoint characteristics (setpoint assigned to vacuum system pressure)

As noted in the previous section, the setpoint threshold can be set using SP1 and SP2 push buttons or the
diagnostic port. The threshold can be set to any pressure within the measurement range of the gauge. A solid
state relay is provided for each switching function. The setpoint relay switching characteristics is set to Low Trip
Point by default as described below:
Low Trip Point (default) - Low Trip Point switching characteristics is assigned to each relay.
If the pressure in the vacuum system is below the setpoint (threshold value), the corresponding LED (<SP1> or
<SP2>) is lit solid and the corresponding relay will turn on (energize). The relay will turn off (de-energize) when
the pressure rises 10% (hysteresis) above the setpoint. Note that hysteresis can only be changed by using the
diagnostic port.
The setpoints SP1 and SP2 are factory set to the lower measurement range limit and therefore do not switch
below those limit.
High Trip Point - High Trip Point switching characteristics is assigned to each relay.
If the pressure in the vacuum system is above the setpoint (threshold value), the corresponding LED (<SP1> or
<SP2>) is lit solid and the corresponding relay will turn on (energize). The relay will turn off (de-energize) when
the pressure drops 10% (hysteresis) below the setpoint. Note that hysteresis can only be changed by using the
diagnostic port.
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