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6. Pre-glow functions
The HMCflex supports a number of glow functions described below.
6.1 Temperature-independent pre-glowing
This pre-glow function with a fixed, temperature-independent pre-glow time can be useful when the
glow plug manufacturer has defined a maximum glow time.
6.2 Temperature-dependent pre-glowing
The controller supports a temperature-dependent pre-glow operation using the internal and the exter-
nal sensor at Pin 3.
If the internal temperature sensor is used, you can use and monitor another temperature switch or
temperature sensor at Pin 3.
Both temperatures Temp1 and Temp2 specify the temperature range in which the system pre-glows
temperature-dependent. The controller linearly determines the glow times between the programmed
times for Temp1 and Temp2. At lower temperatures than specified in Temp2, the system pre-glows
with the maximum glow time programmed in "Time Temp2".
Example:
Temp1 = 10°C
Temp2 = -30°C
Time1 (Temp1) = 10s
Time2 (Temp2) = 30s
6.3 After-glow function
The after-glow time is determined with a factor of the fixed or temperature-dependent pre-glow time
and started immediately after the disengaging the starter at the KL.50F function output.
6.4 Glow plug cleaning
The glow plugs may require cleaning when for an extended time no glowing action has been complet-
ed during operation or at warm ambient temperatures. In this case, combustible deposits may occur at
the glow plug or helix. To prevent this, you can set under [4] Glow times a long-term interval for flash-
ing the glow device during operation.
28/40
Operating Instructions
Temp2
Time2
-40
-30
-20
-10
Temperature-dependent pre-glowing
Versoin 2.9.4
Time / s
30
20
Temp1
10
Time1
Temperature / °C
0
10
© ehb Errors expected.
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