MS4PMUHVT Multi-Stage Electronic Temperature Control with ...

Control Functions
Temperature Management Functions
SI (Displays in Mode 4i only) Setpoint is the primary
temperature setting (°F or °C) programmed by the
user. For information on function in each mode, see
Modes of Operation.
S2, S3, S4 Setpoint 2, Setpoint 3, Setpoint 4 depend
on the mode used. For information on function in each
mode, see Modes of Operation.
30 o F
Temperature
Setpoint
Sensed
Temperature
HI, H2, H3, H4 Differentials are the difference (F° or
C°) between the value at which an output is switched
Off and the value at which an output is switched On
(relay contacts closing and opening, initiating or
ending an On cycle). For information on function in
each mode, see Modes of Operation.
HL, LL High and Low Setpoint Stops are
temperature values (°F or °C) that define how high or
low the primary Setpoint may be adjusted. Setpoint
stops deter unauthorized or accidental overadjustment
of Setpoint.
On
Off
On
Off
Load Demand
Output Status
20 o F
Output Status
(up to four stages)
Time (Minutes)
2 4 6 8 10 12 14 16 18
Figure 18: Soft Start
Soft Start Example:
Temperature = 20°
Setpoint = 30°
Soft start = 2 minutes
Rate of Increase =
Soft start x (setpoint – sensor reading)
20
On
Off
Cycle Delay
Time
Figure 17: Cycle Delay
Cc Cycle Delay, Cooling establishes the minimum
time in minutes between two subsequent On cycles of
cooling (direct) stages. See Figure 17.
CH Cycle Delay, Heating establishes the minimum
time in minutes between two subsequent On cycles of
heating (reverse) stages. See Figure 17.
iS Interstage Time Delay is the minimum amount of
time between two successive stages when multiple
stages are called for in rapid sequence.
rt Soft Start controls the rate at which the controlled
temperature is allowed to approach Setpoint on power
up, both initially and when the binary input is
configured as remote shutoff. The setting is
minutes/temperature units, such as minutes/F°. See
Figure 18.
Controlled temperature increases by 1° every
two minutes, until the setpoint temperature is
reached. To go from 20° to 30° takes 20 minutes.
So Temperature Sensor Offset allows compensation
for temperature differences between actual and
displayed temperature, such as when using long
sensor leads. See Table 1 to determine the
temperature value to compensate for long sensor lead
extensions.
Un Temperature Units Used allows selection of
Fahrenheit or Celsius temperature scale.
PU Display Refresh Rate establishes the time delay
(seconds) between updates of the temperature
display.
Lc, Uc Heating Reset and Cooling Reset are
automatic shifts of the setpoint, based on the
temperature at the Auxiliary Temperature Sensor
(ATS). See Temperature Reset for more information.
NC Non-compensated Band establishes the
temperature range (F° or C°) over which reset does
not take place.
MS4PMUHVT Multi-Stage Electronic Temperature Control with Relay Pack Product/Technical Bulletin 11