Extended Speed Supervision - Siemens LMV37.4 Series Basic Documentation
Basic unit with integrated fuel-air ratio control for forced draft burner
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12.9.1 Extended speed supervision
Additional supervision limits can be activated via the OEM level for different operating
states. A check is only carried out to determine whether the value was exceeded or
fallen short of here. A shutdown takes place after the Maximum time outside close range
(parameter 665, default setting 3 s) has elapsed. An interruption in the speed feedback
signal results in a safety shutdown within 1 second.
These limits can also be activated in pneumatic operation if a speed signal is present.
No.
Parameter
226
Gas: Preignition time
266
Oil: Preignition time
665
Speed supervision: Maximum time outside close range
667
Minimum prepurge speed
668
Maximum ignition speed
669.0
Minimum / maximum speed limitation in operation
Index 0 = minimum speed
669.1
Minimum / maximum speed limitation in operation
Index 1 = maximum speed
Speed
Valid
prepurging
range
Minimum
prepurge
speed
(parameter
667)
Start
Prepurge
phase
phase
Figure 86: Extended speed supervision
Note!
The standardization in pneumatic operation is only possible if at least one
extended speed supervision has been activated (parameter 667, 668 or 669.0 /
669.1). The supervisory functions are deactivated in the presetting
When supervising the maximum ignition speed, the preignition time (parameter
226 / 326 or 266 / 366) must correspond to at least the time setting Maximum
time outside close range (parameter 665)
Basic documentation LMV37.4...
12 Fan control
Maximum
ignition
speed
(parameter 668)
Valid
operating
range
Valid
ignition
range
Operation
Ignition
phase
phase
CC1P7546en
17.12.2018
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