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CONFIRM FAN/MOTOR COMPATIBILITY
Confirm TRIAC (voltage control) compatibility with
the fan/motor manufacturer before installation.
Attempting to control a motor that is not compatible
could cause excessive heating and permanent
damage.
SETTING CONTROL MODES (switches #7, 8)
Unless otherwise specified, the Nimbus-HP is factory set
to control fans in the Temperature Control mode. To
control via a current or voltage source, remote powered
transducer or fixed speed setting, set switches 7 and 8
as shown below, then refer to the control mode section
you have selected to customize the Nimbus-HP for your
application.
USING CURRENT OR VOLTAGE CONTROL MODE
Unless otherwise specified, the Nimbus-HP is factory set
to control fans in the “Temperature Control” mode. To
switch to controlling fan speed via a “Control Signal”,
refer to table 2. Select the type of control signal you are
using [I for 0-20mA (30mA Max.) or V for 0-10VDC
(12VDC max.)] using the jumper on header J2. The
Nimbus-HP can also be customized to accept other
control schemes, contact customer service for details.
Setting Idle Speed (switch #2, 3)
The idle speed is the minimum voltage (as a % of supply
voltage) supplied to the fan. The Nimbus-HP is factory
set for idle speeds of 30, 40, 50 and 60% by setting DIP
switches 2 and 3. The default idle setting is 50%.
Other idle speeds can be supplied, contact customer
service for details.
Fan On / Fan Off Feature (switch #1)
To turn fan(s) off below the set idle speed (see table 3),
set switch #1 to the ON position. To keep fans running
at idle speed below the set idle speed, set switch #1 to
the OFF position.
Control Signal Loss Options (switch #6)
If the control signal is lost, (less than 4mA in I mode, less
than 2VDC in V mode) when switch 6 is OFF, fans will
continue to idle or remain off. To send fans to full speed
if the control signal is lost, set switch 6 to the ON
position.
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USING TEMPERATURE CONTROL MODE
The Nimbus-HP can automatically control temperature
(air, liquid or surface) by proportionately increasing or
decreasing fan speed as required. Up to 3 sensors can
be used to sense temperature. When more than one
sensor is used, the hottest sensor will control fan speed.
To set the Nimbus-HP to temperature control mode refer
to table 2.
Control Temperature (switch #4, 5)
The control temperature is the point above which fans
will run at full speed (TC). The Nimbus-HP is factory set
to control fans at 30, 35, 40 or 45°C by setting DIP
switches 4 and 5 (see table 4). The default setting is
35°C. Other temperature setting can be supplied,
contact customer service for details.
Setting Idle Speed (switch #2, 3)
The idle speed is the minimum voltage (as a % of supply
voltage) supplied to the fan. The Nimbus-HP is factory
set for idle speeds of 30, 40, 50 and 60% by setting DIP
switches 2 and 3, see table #3. The default setting is
50%. Other idle speeds can be supplied, contact
customer service for details. See figure 3.
Temperature Slope (switch #6)
The temperature slope (TS) is the temperature difference
between idle speed and full speed. The slope can be
set at 4°C or 10°C by using DIP switch #6. The default
setting is 4°C. Other slopes can be supplied, contact
customer service for details. See figure 3.
Fan On / Fan Off Feature (switch #1)
To turn fans off automatically when temperatures drop
below the set idle temperature (TC – TS), set switch #1 to
the ON position. To keep fans running at idle speed
below the set idle temperature, set switch #1 to the OFF
position. See figure 3.
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