Peter electronic 2C000.23020, Инструкции по сборке и пусконаладке

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VBMS .... 15
Calculating the cyclic duration factor (ED):
If the required cyclic duration factor (c.d.f.) exceeds the permissible values indicated on the data
sheet, the permissible maximum braking current is to be accordingly reduced. The data required
in this connection can be found in the device-specific commissioning instructions.
If it is not possible to reduce the braking current, a braking device with a higher braking current
has to be used.
Example: If the required c.d.f. is twice as high as the value indicated on the data sheet, a
braking device of twice the nominal/rated device durrent has to be used.
13.2 Dimensioning of pre-fuses
Basically, two types of fuse protection are available for the user:
1. Fusing according to allocation type „1“, DIN EN 60947-4-2.
After a short circuit, the braking device is allowed to be inoperative.
2. Fusing according to allocation type „2“, DIN EN 60947-4-2.
After a short circuit, the braking device must be suitable for further use. However, there is
the danger that the contacts of the braking relay (braking contactor) weld. Therefore, if
possible, these contacts are to be checked prior to applying again mains voltage to the
device. If this check cannot be carried out by the user, the device has to be returned to the
producer in order to have it checked.
The following dimensioning information refers to the below operating conditions:
• Use of standard asynchronous motors
• Braking time not exceeding 20s, for braking devices up to 36A
• Braking time not exceeding 40s, for braking devices from 40A up
• Braking current not exceeding 2.5x I
NOM
of the motor.
• Cyclic duration factor (c.d.f.) not exceeding the value indicated in the data sheet.
t
B
= Braking time
t
Z
= Cycle time (Running-Braking)
100
t
t
ED
Z
B
⋅ ⋅