Siemens LME7 Series Technical Instructions page 33

LME Series
LEGEND - Password Level: S = Service; O = OEM; S/O = View - Service, Write - OEM; Info = Info Menu; Ser = Service Menu
Parameter
Shaded Parameters = Frequently Used
Parameter Name
Number
PW Level
Minimum PWM
658.01
Signal
658.02 Maximum PWM Signal
659.00 Min Ramp Up
659.01 Max Ramp Up
659.02 Min Ramp Down
659.03 Max Ramp Down
660 Tolerance Band 1 Time
Minimum Speed
674
Change
Minimum PWM
675.00
Signal Prepurge
Maximum PWM Signal
675.01
Ignition
676 Proportional Band
677 Integral Time
678 Derivative Time
Lower Range Time
679.00
Constant
Medium Range Time
679.01
Constant
Upper Range Time
679.02
Constant
Total Range Time
679.03
Constant
Upper Speed Range
680.00
Threshold
Lower Speed Range
680.01
Threshold
SCC Inc.
Default Range
0% 0-20%
S/O
100% 80-100%
S Read only
40 RPM 0-255 RPM
86% 0-100%
34% 0-100%
112 0-255
0.441 sec 0-37.485 sec
S/O
0 sec 0-37.485 sec
6.027 sec 0-37.485 sec
6.027 sec 0-37.485 sec
6.027 sec 0-37.485 sec
6.027 sec 0-37.485 sec
4000 RPM 800-9000 RPM Sets the speed threshold between the upper and medium speed ranges for parameters 679.01 and 679.02.
2000 RPM 800-9000 RPM Sets the speed threshold between the lower and medium speed ranges for parameters 679.00 and 679.01.
Sets a minimum PWM signal that the LME7 will transmit to the PWM blower.
Sets a maximum PWM signal that the LME7 will transmit to the PWM blower.
For Siemens use only. Sets the minimum allowable value for the ramp up time (parameter 522).
For Siemens use only. Sets the maximum allowable value for the ramp up time (parameter 522).
For Siemens use only. Sets the minimum allowable value for the ramp down time (parameter 523).
For Siemens use only. Sets the maximum allowable value for the ramp down time (parameter 523).
For Siemens use only. Sets the amount of time the blower speed can lie outside of tolerance band 1
before a lockout occurs.
Only requested speed changes larger than the value of this setting will actually be corrected. This serves
as a dead band to protect the PWM blower from constant small speed oscillations.
Sets the minimum allowable PWM signal that the LME7 will transmit to the PWM blower during prepurge.
This should be set so that as long as the blower speed remains at or above this setting, a successful
prepurge will occur regardless of all other conditions (air temperature, air pressure, undervoltage to
blower, etc.)
Sets the maximum allowable PWM signal that the LME7 will transmit to the PWM blower during ignition.
This should be set so that as long as the blower speed remains at or below this setting, a successful lightoff
will occur regardless of all other conditions (air temperature, air pressure, overvoltage to blower, etc.)
P-part of the PID loop controlling the blower speed when closed-loop speed control is used. P is the
proportional band. Smaller values give a more aggressive response. It is recommended to leave this
setting at the default value.
I-part of the PID loop controlling the blower speed when closed-loop speed control is used. I is the integral
(reset) function. This component serves to eliminate steady-state error by looking at the accumuation of
error over a period of time and correcting for it. Smaller values give a more aggressive response. It is
recommended to leave this setting at the default value.
D-part of the PID loop controlling the blower speed when closed-loop speed control is used. D is the
derivative function. This component serves to eliminate overshoot caused by the integral value, and also
dampen the action of the P and I values. Smaller values give a weaker response. It is recommended to
leave this setting at the default value.
Sets the time constant for speed control in the lower speed range when ramping down. It is
recommended to leave this setting at the default value.
Sets the time constant for speed control in the medium speed range when ramping down. It is
recommended to leave this setting at the default value.
Sets the time constant for speed control in the upper speed range when ramping down. It is
recommended to leave this setting at the default value.
Sets the time constant for speed control in all speed ranges when ramping up. It is recommended to leave
this setting at the default value.
Page 9
Description
Technical Instructions
LME-1000
PME71. PME71. PME71.
111A1 112A1 901A1
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Section 2