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5.
Adjusting the ITM-A
5.1
General
Before the ITM-A can be used, the Triac, the maximum number of revolutions and the control input should first be
adjusted, depending on the setting. The position of the dipswitches is important for this adjustment (see table
below).
Adjustment of:
Adjust 1% fan control output
Maximum revolutions
Control input
5.2
Adjusting the 1% fan control output
Only adjust the 1% fan control output to increase the minimum fan speed. When an I-fan is used, this is
not necessary.
1.
Open the lid of the ITM-A housing.
2.
Position the dipswitches (9 =On, 10 =Off).
3.
Turn the rotary knob on the front to its "minimum position", so that the fan is running at the desired minimum
speed (this depends on installation).
4.
The red led (L1) flashes: briefly on, long period off. The green led (L2) is off. This means that the 1% is be
adjusted.
5.
When the required voltage has been set, confirm this by pressing the calibration knob. The green led (L2)
flashes.
6.
The green led will go off after five seconds, 1% adjustment has been completed.
7.
The ITM-A has completed the 1% adjustment after five seconds. The status of adjustment can now be shown:
- Green led on
- Red led on
Control vortex damper
The ITM-A also controls the analog output for the control or adjustment of the vortex damper. The output of the
analog output is 1% during 1% adjustment.
After adjustment set dipswitches 9 and 10 to ON and the knob to A.
DIP 9
On
Off
Off
:
Adjustment successful.
:
Adjustment unsuccessful. Adjust again.
Gndf
DIP 10
Off
Off
On
g
9
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