High Country Tek HFS-2Q - Manual (Page 16)

Hydraulic Fan System Controller : HFS - 2
Thermistor Status :
The RED error led that flashes an ‘Error code’ when fault conditions that have no other visual indicator have been
Error Indicator:
The RED LED for the thermistor that is controlling the fan comes on steadily while the other thermistor LEDs are
off, if no more than one thermistor is above setpoint. If multiple thermistors are above setpoint, the thermistor
that is controlling the PI process has a blinking LED and the others above setpoint are on steady.
The RED error led that flashes an Error code when fault conditions that have no other visual indicator have been
detected.
The LED blinks error codes if faults have been detected with the thermistor inputs, module temperature, module
memory and alarm output.
The blink code will occur at a rate of 0.5 seconds on and 0.5 seconds off with a two second pause before repeating.
Only the highest priority blink code will be displayed.
See table below for blink codes, with the lower number of blinks having higher priority.
A controller unit temperature greater than 80C will be indicated by the error LED ‘ON’ until retried if "retry fault" is
selected, or until power is cycled OFF then back ON.
The unit calculates the checksum of the internal FLASH program and the user settings data file at power up.
If the checksum is incorrect, the unit is corrupt and will turn OFF all outputs (except for alarm) and flash ALL LEDs
except for the Power LED which is required for OptoLink communication and the Reverse Input LED that is driven
directly by the Reverse Input.
This condition is cleared by re-loading the FLASH program and/or the stored user characteristic data file.
This above situation should never occur unless power is lost during file storage or up or download.
If memory checksum failure occurs without an attempt to update FLASH or the user data file the corrupted unit
If memory checksum failure occurs without an attempt to update FLASH or the user data file, the corrupted unit
should be returned without correcting the problem to HCT for failure analysis.
The other fault conditions stop flashing when the triggering error is cleared or if unit power is cycled depending on the
‘Retry Fault’ user setting.
Error Indicator ‘Blink’ Code:
No. of blinks Fault / Error
1 Memory checksum error
2 Unit temperature greater than ( > ) 75C p g ( )
3 Selected thermistor input shorted
4 Selected thermistor input open
5 Alarm output shorted
6 Over temp reached on one or more thermistor
inputs.
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