12.2010 Configuration and Connection Examples
Siemens AG 6SE7087-6QX70 (Version AM)
SIMOVERT MASTERDRIVES Compendium Motion Control 2-15
An external braking resistor can be connected on braking units up to
P
20
= 20 kW in order to increase the continuous braking power.
The internal braking resistor has to be disconnected in this case. On
braking units where P
20
> 20 kW, operation is only possible with an
external braking resistor.
The braking units have to be fused on multi-axis drives (see Catalog
DA65.11).
If a braking unit is used on multi-axis drives or with strongly varying
inverter outputs, a free-wheeling diode has to be used (see Catalog
DA65.11).
You will find preassembled encoder cables in Catalog DA65.11,
chapter 3. Please note that different encoder cables are required for
encoders and multiturn encoders. If the wrong encoder cable is used
for one or the other, fault F051 (during operation) or alarm A018 or
A019 is generated.
The encoder cable must only be connected and plugged in when the
converter is disconnected from the supply (24 V and DC link). Damage
to the encoder could result if this advice is not heeded. This especially
concerns the multiturn encoder EQN1325. Encoder or encoder cable
faults can result in incorrect field orientation and therefore in
uncontrolled axis movements.
20) External braking
resistor
21) Fuses for
braking unit
22) Free-wheeling
diode
Encoder cable
DANGER
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