drive. In this case the factory installed jumper should be removed. This will decouple the board ground
reference from the speed signal to allow for minor voltage differences between the power supply
grounds. The common mode range is -1.0 to +1.0V. The secondary power supply for speed control can
then be wired between the speed input and speed low connections to vary compressor speed. The
connection to the compressor speed low is a .187” faston tab. See the jumper configuration table at the
end of this section for details.
10. Compressor Status (TB16)
This tab is available to monitor the normal operation of the compressor. When a speed signal is being sent
to the drive and the compressor is operating normally, there will be no voltage on this connection.
However, if a speed signal is present and the compressor enable is satisfied but the compressor is not
running, 5 volts will be present on this tab. This 5v signal can be monitored to alert the end user that there
is a problem with the system and that the compressor is not running.
Additional Board Functions
1. Compressor Start Delay – The Aspen drive has the ability to delay the compressor start in situations
where starting may be difficult due to an unbalanced system. The logic behind the delay is based on a
minimum off time for the compressor and can be enabled by installing jumpers per the table at the end
of this section. When activated the controller keeps track of how long the compressor has been turned
off before trying to restart. If the compressor has been off for the minimum amount of time set by the
dip switch when there is a call to restart, it will start immediately. If the minimum amount of time has
not passed, the compressor will wait until the minimum time has been reached before attempting to
start.
2. Board Overheat – The Aspen drive has an onboard thermistor that enables the drive to prevent itself
from overheating. When the board detects that it has overheated, the drive will stop the compressor
and emit a series of 8 flashes on the red LED.
3. Automatic Current Limiting – The Aspen drive has the ability to regulate the amount of current being
used by the compressor. The 12v & 24v drives have a user selectable 10 or 15 Amp limit. The 48V has a
user selectable 8 or 10 Amp limit. The drive will automatically monitor the current consumption of the
compressor. If the compressor motor begins to draw more than the maximum set current, the drive
will automatically decrease the speed of the compressor in an effort to reduce the current being used.
When this happens, the red LED will illuminate as well as the green to inform the operator that the
compressor is operating in this mode. If the speed of the compressor continues to be reduced due to
overcurrent, the compressor will eventually stall and flash the red LED continuously to allow the user to
know that the compressor has stalled from excessive current draw or a lock rotor condition. It should
be noted that the automatic current limit only reduces the current used by the compressor motor and
does not account for any current that may be drawn by the use of the condenser fan output.
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