Future Design FDC-C42 Installation Setup Manual

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3.1 Control Output Hysteresis
The control type for relay output 1 is pre-configured for cooling (direct action). The control hysteresis
(prompt O1HY) is safe-sided. The control relay’s output will operate in the following manner. For example,
the set point is -80° (F or C), and the control hysteresis value is 2.0. The control relay’s output will be
energized until the temperature reached -82° and then de-energize. When the temperature rises to -80° or
above, the control relay’s output is energized. When the control relay’s output is energized, the control
output status indicator (labeled OUT1 on the front panel) will be illuminated.
To change the control hysteresis, enter the Setup menu and access the output parameters as follows:
• Press and Hold scroll key for 5 seconds
to enter Setup menu (upper display will
show SET).
• Press up or down key repeatedly to
access output parameters (lower display
will show OUT).
• Press scroll key to cycle through output
parameters and access output 1
hysteresis (upper display will show O1HY
and lower display will show current
value).
• Press up or down key to change
hysteresis value.
• Press reset key to exit menu and return
to normal PV/SV display.
3.2 Temperature Alarm Set Point and Hysteresis
The alarm type for relay output 2 (AL1) is pre-configured for deviation band. This means that the alarm
deviation set point (A1DV) follows the control set point evenly above and below the main control set point.
The alarm hysteresis (A1HY) is safe sided.
The alarm relay’s output will operate in the following manner. For example, the main control set point is -
80° (F or C), the alarm deviation set point (A1DV) is 12° and the alarm hysteresis value (A1HY) is 0.1. The
alarm relay’s output will be energized when the temperature is outside of the deviation alarm band (below
-92° or above -68°). The alarm relay will de-energize when the temperature falls within the hysteresis band
(between -91.9° and -68.1°). When the alarm relay’s output is energized, the alarm output status indicator
(labeled AL1 on the front panel) will be illuminated.
To change the alarm set point and hysteresis values, enter the Setup menu and access the alarm
parameters as follows:

Future Design FDC-C42 Specifications

General

Brand	Future Design
Model	FDC-C42
Category	Controller
Language	English