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Building Technologies Division
Basic Documentation LME7...
CC1P7105en
Infrastructure & Cities Sector
27 PWM settings
29.11.2011
27.2
PWM control parameters
Parameter
Meaning
522
Ramp-up
Control parameter ”Ramp time” is the preset time in seconds (s) within which the PWM signal
reaches the setpoint with a positive setpoint step (0 rpm to high-fire rpm).
Factory setting: Approx. 15 seconds
523
Ramp-down
Control parameter ”Ramp time” is the preset time in seconds (s) within which the PWM signal
reaches the setpoint with a negative setpoint step (high-fire rpm to 0 rpm).
Factory setting: Approx. 15 seconds
646
Settling time for assessment of speed
The current speed must lie within tolerance band 1 (P650.00) of the required speed for this period of
time before the target speed is considered reached (speed release).
650.00
Tolerance band 1 (speed shutdown)
Factory setting: 1%
If the current speed leaves value range
Required speed ± set tolerance band 1
for a period of time
exceeding the time set with parameter P646, lockout Loc 83 will be initiated.
650.01
Tolerance band 2 (quick speed shutdown)
Factory setting: 3%
If the current speed leaves value range
Required speed ± set tolerance band 2
, lockout Loc 83 will
immediately be initiated.
660
Tolerance time speed deviation
A speed deviation outside tolerance band 1 (P650.00) will be tolerated for the period of time set. If it
lasts longer, lockout Loc 83 will be initiated.
674
Neutral band
Minimum speed change in revolutions per minute.
Factory setting: 40 rpm
Protection from speed oscillations.
Only control offsets with speed changes above the setting value will be corrected (dead band).
679.00
Time constant PT1 controller for speed control in the upper speed range high-fire to low-fire.
679.01
Time constant PT1 controller for speed control in the medium speed range high-fire to low-fire.
679.02
Time constant PT1 controller for speed control in the lower speed range high-fire to low-fire.
679.03
Time constant PT1 controller for speed control in the entire speed range low-fire to high-fire.
680.00
Threshold between upper and medium speed range for control parameters P679.02 and P679.01.
680.01
Threshold between medium and lower speed range for control parameters P679.01 and P679.00.