Nord Drivesystems NORDAC FLEX SK 200E Series User Manual page 144

NORDAC FLEX (SK 200E ... SK 235E) – Users Manual for Frequency Inverters
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DC brake current
P109
(DC brake current)
0 ... 250 % Current setting for the DC braking (P108 = 3) and combined braking (P108 = 5) functions.
{ 100 } The correct setting depends on the mechanical load and the required stopping time. A higher
setting can bring large loads to a standstill more quickly.
The 100% setting corresponds to a value for current as stored in parameter P203 >Rated
current<.
NOTE:
DC braking: Not for PMSM motors!
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Time DC-brake on
P110
(DC brake time on)
0.00 ... 60.00 s The time during which the current selected in parameter P109 is applied to the motor for the "DC
braking" function selected in parameter P108 (P108 = 3).
{ 2.00 }
The >DC brake time< is shortened depending on the ratio of the prevailing output frequency to
the max. frequency (P105).
The time starts running when the enable is removed and can be interrupted through a re-
enabling.
DC braking: Not for PMSM motors!
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P factor torque limit
P111
(P factor torque limit)
25 ... 400 % Directly affects the behavior of the drive at the torque limit. The basic setting of 100% is sufficient
for most drive tasks.
{ 100 }
If values are too high, the drive tends to vibrate as it reaches the torque limit.
If values are too low, the programmed torque limit can be exceeded.
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Torque current limit
P112
(torque current limit)
25 ... 400%/401 A limit for the torque-generating current can be set with this parameter. This can prevent
mechanical overloading of the drive. However, it cannot provide any protection against
{ 401 }
mechanical blocks (movement to stops). A slipping clutch acting as a protective device is
essential.
The torque current limit can also be set over an infinite range of settings using an analog input.
The maximum setpoint (cf. 100% calibration, P403[-01] . .[-06]) then corresponds to the setting in
P112.
The 20% current torque limit cannot be undershot even by a smaller analog setpoint (P400[-01]
... [-09] = 11 or 12). However, in servo mode ((P300) = "1") a 0% limit is possible as of firmware
version V 1.3 (older firmware versions: min. 10%)!
401 = OFF stands for the torque current limit switch-off! This is also the basic setting for the
VFD.
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144
The possible direct current (0 Hz) that the VFD can supply is limited. Please refer to
the table in section 8.4.3 "Reduced overcurrent due to output frequency", 0 Hz
column, for this value. In the basic setting this limit is 110%.
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BU 0200 en-US-3118