Lenze MC1000 Series - Manual (Page 50)

46 13435742_EDBM101_v24
8 ACCEL (ACCELERATION TIME)
ACCEL sets the acceleration rate for all speed reference sources (keypad, speed
pot, 4-20 mA, 0-10 VDC, jog, and the preset speeds). The ACCEL setting is the time
to accelerate from 0 Hz to the BASE FREQUENCY (Parameter 18). The range of
adjustment for ACCEL depends on horsepower. Refer to the following table:
ACCELERATION LIMITS
120 - 240 Vac
Models
400 - 590 Vac
Models
RANGE OF ADJUSTMENT
0.25 - 20 HP 1 - 20 HP 0.1 - 3600 SEC
25 - 30 HP 25 - 60 HP 0.3 - 3600 SEC
40 - 60 HP 75 - 150 HP 1.0 - 3600 SEC
Example: If ACCEL is set to 30 seconds, and the BASE FREQUENCY is set to 60
Hz, the drive will ramp from 0 Hz to 60 Hz in 30 seconds. This is a linear function,
therefore the drive would ramp up to 30 Hz in 15 seconds, etc.
NOTE: The ability to accelerate a given load at a particular rate will be limited by the
output power capability of the drive/motor combination. The acceleration of high-
inertia and high-friction loads may be affected by the current limiting characteristics
of the drive. Refer to Parameters: 16 - CURRENT, 19 - FX BOOST, and 20 - AC
BOOST for more information.
9
DECEL (DECELERATION TIME)
DECEL sets the deceleration rate for all speed reference sources. The DECEL
setting indicates the time to decelerate from BASE FREQUENCY to 0 Hz. As with
Parameter 8 - ACCEL, this is a linear function. If the drive is set to COAST to stop,
this parameter will have no effect when a STOP command is given. The range of
adjustment for DECEL depends on horsepower, voltage, and whether Dynamic
Braking (DB) is being used. Refer to the table below:
DECELERATION LIMITS
HORSEPOWER / VOLTAGE RATING RANGE OF ADJUSTMENT
120 - 240 Vac
Models
(NOTE 1)
480/400 Vac
Models
590 / 480 Vac
Models
WITHOUT DB
(NOTE 2)
WITH DB
0.25 - 7.5 HP 1 - 7.5 HP ---- 0.3 - 3600 SEC 0.1 - 3600 SEC
10 - 15 HP 10 - 20 HP 1 - 7.5 HP 0.5 - 3600 SEC 0.1 - 3600 SEC
20 - 30 HP 25 - 60 HP 10 - 20 HP 1.0 - 3600 SEC 0.2 - 3600 SEC
40 HP ---- ---- 1.0 - 3600 SEC 0.3 - 3600 SEC
---- ---- 25 - 60 HP 2.0 - 3600 SEC 0.2 - 3600 SEC
60 HP 75 HP ---- 3.0 - 3600 SEC 0.8 - 3600 SEC
---- 100 - 150 HP ---- 7.0 - 3600 SEC 1.8 - 3600 SEC
NOTE 1: 120/240 Vac units have the same limits as 240/200 Vac units.
NOTE 2: The parameter value can be set below the minimum value shown, but the
value shown is the operational limit of the drive. For example, if DECEL is set for 0.1
seconds on a 10 HP, 480 Vac drive without dynamic braking, the actual deceleration
time would be 0.5 seconds.