Siemens LMV3 series, Technical Instructions, Page: 63 / 224

LMV Series
Technical Instructions
LV3-1000
Gas Oil Gas Oil U/S/O Default Range Description
Parameter #
Fuel 0 Fuel 1
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.
Parameter Name
Speed Eval Time S/O 8 4-8
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.
VSD Safety Loop 1 0-1
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.
Speed Eval Standby 1 0-1
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
PI Control 1 0-1
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
VSD Neutral Zone +/- 0.5% +/- 0.5-3.5%
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.
VSD Near Zone +/- 2% +/- 2-5.5%
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.
Near Zone Time 8 sec 8-16 sec
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.
Outside Near Zone
Time
3 sec 3-7 sec
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.
Min Speed Prepurge Not set 40-100%
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.
647
652
653
667
S/O
S
661
662
663
664
665
SCC Inc. Page 15 Section 3