MS4PMUHVT Multi-Stage Electronic Temperature Control with Relay Pack Product/Technical Bulletin
9
Independent Setpoint Mode
Independent Setpoint mode is used for applications
requiring cooling and heating. Where desirable, stages
may overlap or have space between them. See
Figure 16.
Setpoint
is the desired heating temperature. It is the
basis for the reverse stages.
In Reverse mode (heating applications), when Setpoint
is reached on a temperature rise, the N.O. relay
contacts open, ending the On cycle.
Setpoint cannot be set higher than Setpoint 2, nor can
Setpoint 2 be set lower than Setpoint. If overlapping
adjustment is attempted, the setting that is not being
adjusted will adopt the value of the setting that is being
adjusted.
Differential
is the operational range of Stage 1.
Setpoint 2
the desired cooling temperature
programmed by the user. It is the basis for the direct
stages.
In Direct mode (cooling applications), when Setpoint is
reached on a temperature drop, the N.O. relay
contacts open, ending the On cycle.
Differential 2
is the operational range of Stage 2.
Setpoint 3
is the offset from Setpoint that activates
Stage 3.
Differential 3
is the operational range of Stage 3.
Setpoint 4
is the offset from Setpoint 2 that activates
Stage 4.
Differential 4
is the operational range of Stage 4.
Interstage Time Delay
is the minimum amount of time
between two successive stages when multiple stages
are called for in rapid sequence.
Cooling
Heating
Setpoint
Stage 1
Stage 2
Stage 4
Stage 3
Differential
Differential 2
Differential 4
Differential 3
Interstage
Time Delay
Interstage
Time Delay
Temperature
Time
Setpoint 4
Setpoint 3
Figure 16: Independent Setpoint Mode
