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Building Technologies Basic documentation LMV37.4... CC1P7546en
12 Fan control 17.12.2018
Error
code
Diagnostic
code
Meaning for the LMV37.4
83 Bit 0
Valency 1
Lower control range limitation
Bit 1
Valency 2...3
Upper control range limitation
Bit 2
Valency 4...7
Interrupt shutdown due to electromagnetic interference
Bit 3
Valency 8
Curve too steep in terms of ramp speed
Bit 4
Valency 16
Interruption of speed signal
Bit 5
Valency 32
Quick shutdown due to excessive speed deviation
Bit 6
Valency 64
Minimum speed fall below
Bit 7
Valency 128
Maximum speed exceeded
192 Incorrect setting: Minimum speed maximum speed
Incorrect setting: Neutral zone close range
255 Error forced travel PWM fan
12.10 Setting the parameters of VSD
If a control signal of 95% (9.5 V) is not sufficient for the burner to deliver its rated
capacity, you can proceed as follows:
Set the maximum frequency to 105.3% of the motor’s rated speed
In the case of a motor frequency of 50 Hz, this means:
Set the maximum frequency of the VSD to 50 Hz x 1.053 = 52.6 Hz (on the VSD).
Then, standardize the speed (refer to chapter Standardization of speed)
There is no risk of motor overload since only 95% of the maximum control signal is
delivered during standardization and – later in operation – the effective speed is
controlled and monitored.
Frequencies of between 50 Hz and 52.6 Hz are delivered only if these are needed for
reaching the required speed due to increased output.
Set the ramp times of the VSD according to chapter Setting the ramp times
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