Siemens MICROMASTER 440 Operating Instructions Manual page 201

Issue 10/06
If the frequency inverter directly controls the motor holding brake using the
relay integrated in the frequency inverter, then the max. load capability of
this relay should be carefully taken into consideration in conjunction with the
voltage/current data of the holding brake. The following applies for the relay
integrated in the frequency inverter:
−
−
If this value is exceeded, an additional relay should, for example, be used.
♦ Indirectly connecting 1
Fig. 3-71
Hoisting gear applications
For high loads and low mechanical friction, especially when lowering a load, energy
is regenerated that can cause the DC link voltage to increase. This increase can be
prevented using dynamic braking (refer to Section 3.15.3; P1237).
In order that there is no negative effect when using dynamic braking, the following
functions should be disabled for hoisting gear applications:
♦ Vdc_max controller P1240
♦ Compound brake P1236
MICROMASTER 440 Operating Instructions
6SE6400-5AW00-0BP0
30 V DC / 5 A
250 V AC / 2 A
st
relay output via an additional relay
Relay
=
Motor with
M
motor
~
3
holding brake
Caution
The relay may not overload the internal 24 V power supply!
Indirect motor holding brake connection
24 V
9
0 V
28
Surge
absorber
diode
COM
20
NO
19
NC
18
COM
22
NO
21
COM
25
NO
24
NC
23
MICROMASTER 440
3 Functions
Output +24 V, max. 100 mA
(isolated)
Output 0 V, max. 100 mA
(isolated)
CPU
201