Siemens LMV3 series Technical Instructions page 63

LMV Series
Parameter #
Fuel 0 Fuel 1
Parameter Name
Gas Oil Gas Oil
647 Speed Eval Time
652
VSD Safety Loop
653
Speed Eval Standby
661
PI Control
662 VSD Neutral Zone
663
VSD Near Zone
664 Near Zone Time
Outside Near Zone
665
Time
667
Min Speed Prepurge
SCC Inc.
LEGEND - Password Access: U = User, S = Service, O = OEM, U/S = View - User, Write - Service, S/O = View - Service, Write - OEM
Shaded Parameters = Frequently Used. ** Parameters = Must Set. Fuel 1 parameters for LMV36 only.
U/S/O Default Range
S/O 8 4-8
1 0-1
S
1 0-1
1 0-1
+/- 0.5% +/- 0.5-3.5%
+/- 2% +/- 2-5.5%
S/O
8 sec 8-16 sec
3 sec 3-7 sec
Not set 40-100%
Sets how long the LMV3 must pause modulation to read and evaluate the VSD speed. These are in 25 ms
increments. Shorter times will allow for the VSD curve to be ramped more steeply between points without
triggering an error code 84.
Sets the behavior of the VSD when the safety loop (or burner flange) is open.
0 = VSD commanded to 0% when safety loop (or burner flange) is open.
1 = VSD control is unaffected when safety loop (or burner flange) is open.
Determines if the speed of the VSD will be monitored during standby (phase 12). If the speed is not
monitored, this parameter also has the effect of permitting the blower to freewheel to standby after
postpurge is complete.
0 = speed is not monitored
1 = speed is monitored
This setting activates or deactivates the internal PI speed controller in the LMV3. Must be set to activated if
using a VFD. If using a brushless DC blower with an internal speed control, this should be deactivated.
0 = deactivated
1 = activated
Sets the width of the "neutral zone" for speed control. Percentages are based on the standardized speed
(parameter 642). When the speed lies within the neutral zone, the speed is considered to be in range and
modulation is not paused. The neutral band has no associated timing.
Sets the width of the "near zone" for speed control. Percentages are based on the standardized speed
(parameter 642). When the speed lies outside the neutral zone, but inside the near zone, modulation is
paused and a timer is started. The allowable time for the speed to reside in this zone band is set by
parameter 664. Modulation will resume if the speed transitions back to the neutral zone.
This sets the maximum time that the motor speed can lie outside the neutral zone and in the near zone (see
parameter 663) before a lockout occurs.
This sets the maximum time that the motor speed can lie outside of the near zone (see parameter 663) but
within the maximum allowable speed deviation of +/-10%. Percentages are based on the standardized
speed (parameter 642). If +/- 10% speed deviation is detected, a quick shutdown will result in less than 1
second.
This is used to guarantee the minimum prepurge speed of the VSD is above this setting when using a gas
train with pneumatic fuel-air ratio control. Do not adjust if using the LMV3 for fuel-air ratio control via
parallel positioning.
Page 15
Description
Technical Instructions
LV3-1000
Section 3