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Building Technologies Basic documentation LMV37.4... CC1P7546en
12 Fan control 17.12.2018
No. Parameter
204
Behavior if analog input is invalid (4…20 mA)
0 = deactivate default output low-fire / trim function (with warning message)
1 = safety shutdown + startup prevention
2 = deactivate default output low-fire / trim function (without warning message)
530
Activation trim function
0 = inactive
1 = active
2 = active (including test function for analog input)
3 = active (including ignition speed)
4 = active (including ignition speed and analog input test)
547 Lower range limit trim function
548 Upper range limit trim function
549 Damping factor for trim function (based on low-fire)
550 Delay time / wait time for trim function after entering phase 60
551 Wait time until response with active trim limitation
552
Behavior if maximum trim limitation time is exceeded
0 = warning message only (trim impact remains active)
1 = warning and deactivation of the trim function
2 = shutdown
12.15.2 Optional internal checks
The LMV37.4 has various settings and monitoring options to ensure that the trim
function runs correctly and error-free. The external control unit and control section are
used here in places. The OEM is responsible for implementing the necessary measures
for fulfilling the local requirements.
Plausibility check for the curve setting
When the trim function is activated, the LMV37.4 carries out permanent supervision of
the speed curve. In order to cover the desired range with the trim function, a sufficient
reserve must be available in the curve setting (e.g. upper trim limit 10% 90%
maximum curve setting). Otherwise, it wouldn't be possible to carry out the desired trim
correction, as the speed would be limited by the minimum or maximum limitation.
Error-
code
Diagnostic code Meaning for the LMV37.4
155 # Trim function: Invalid curve setting VSD / PWM fan
0..9 Minimum value VSD curve fall below
20..29 Maximum value VSD curve exceeded
40..49 Fuel 1: Minimum value VSD curve fall below
60..69 Fuel 1: Maximum value VSD curve exceeded
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