Bosch 4306 Service Manual download pdf (Page 29)

• DOK-POWER*-KDV*2.3****-ANW1-EN-E1,44 • 06.97

rot ZW

⋅

150 60

min

()

RR pL

MMM

AZK A

ZK ZK H

⋅

ω()()

max

Switching frequency

Service life

Maximum drive torque

CAUTION

A maximum of six switching procedures is permitted per minute.

The number of possible switching sequences is reduced if the sum of the

rotary drive energy and the energy stored in the additional capacitance is

greater than 1500 Ws. Otherwise, the DC bus short-circuit resistor will be

overloaded. The number of the permissible DC bus short-circuit actuations

can be calculated as follows:

S = number of permissible actuations per minute (max. 6)

rot

= energy content of the drive given in Ws

= energy stored in the additional capacitance given in Ws

The DC bus circuit contactor has a service lifespan of 20,000 actuations.

Once the DC bus is short circuited, the drive will be decelerated with the short-

circuit torque. This torque may be higher than the maximum torque indicated

in the selection list. Particularly, if the relationship maximum torque to short-

term operating torque is less than 1.3, then there will probably be increased

torque.

Increased torque with short-circuited DC bus is possible.

Damage to mechanical transmission parts, machine damage from

dimensional shifting that has gone unnoticed.

==> mechanical transmission elements must be laid out in terms of the

torque at with a short-circuited DC bus.

A list of the short-term torque for MDD motors can be requested. The following

formula can be used to calculate maximum torque with a short-circuited DC

bus.

maxZK

= max . drive torque with short-circuited DC bus

= short-circuit torque in Nm

= decel torque of the holding brake in Nm

Km = current torque or voltage constant in Vs/rad

ω = angle speed in rad/s

= winding resistance of the motor in Ω

= DC bus short-circuit resistance in Ω (2.2 Ω)

p = number of pole pairs; for MAC and MDD the following applies:

size ≤ 41; p = 2

size ≥ 63; p = 3

= winding inductance of the motor in H

4. Control circuits

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Bosch 4306 Service Manual Page 29

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