Additionally, the condenser fan output should also be fused if it is to be used. Recommended fuse size for
the condenser fan output are as follows:
1. Condenser Fan Output (TB7 & TB8)
An output has been provided for running condenser fan(s) from the Aspen drive. The voltage of this output
will be equivalent to the DC input voltage provided to the board. The power to the condenser fan is
enabled 10 seconds after the drive starts the compressor. Therefore, when the compressor is off, the
power to the condenser fan(s) is off. When the compressor is signaled to run, the power to the condenser
fan(s) will be enabled 10 seconds after the compressor has started running. This 10 second delay is
intentional and is meant to reduce the total amount of inrush current when the compressor starts. The
connections to the condenser fan outputs are two .250” faston tabs. The condenser fan output should be
limited to a maximum of 5 amps on 12/24 volts boards and 3 amps on 48 volt boards. When in use, the
outputs require an inline fuse for safe operation. Install the appropriate inline fuse per the table above.
2. Ground (TB9)
The ground tab is for connecting both the compressor enable and compressor over temp connections to.
Both the compressor enable and the compressor overheat connections must be connected to ground in
order for the compressor to operate. The connection to the ground is a .187” faston tab.
3. +5V (TB10)
The +5v tab is provided to give the user the ability to provide a low voltage speed signal input without the
use of an additional power supply. The 5 volts can be wired directly to the speed input tab, which will cause
the compressor to operate at full speed, or can be wired to a 20k potentiometer to allow the user to vary
the voltage to the speed input tab and vary the speed of the compressor. The connection to the +5v is a
.187” faston tab.
4. Compressor Overheat (TB11)
In order for the compressor to operate, the overheat tab connection must be connected to the thermal
safety switch, which is then connected to ground. When used in conjunction with the thermal switch, the
drive will shut the compressor off when the thermal switch indicates that the compressor has overheated.
Once this has occurred, the board will flash the red LED a sequence of 16 flashes to indicate that the
compressor has overheated. To restart the compressor, the thermal switch must reset and the user must
either cycle the main power on the drive board or momentarily disconnect the enable wire from ground.
The connection to the compressor overheat is a .187” faston tab.
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