SIEMENS
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Siemens D 35 · 2017
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SINAMICS G120P built-in and wall-mounted units
PM330 Power Modules, 160 kW to 630 kW
Braking Modules
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Overview
Braking Module
A Braking Module and the matching braking resistor are needed
by the drive when it brakes or needs to be stopped for a specific
reason, e.g. for an EMERGENCY STOP. Large fans which are
caused to rotate by air flow are a typical application. In such
instances, it is important to consider operating states which
could result in speeds in excess of the desired maximum speed
but also the possibility of reversal of rotational direction during
restart from standstill. A braking unit is also required if the fan
must be brought to a standstill within a defined time period.
The Braking Module houses the power electronics and the asso-
ciated control circuit. The supply voltage for the electronics is
taken from the DC link.
During operation, the DC link power is converted into heat loss
in an external braking resistor.
The activation threshold of the Braking Module can be adjusted
by means of a switch. The braking power values indicated in the
technical specifications apply to the upper activation threshold:
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Design
The Braking Module is designed for installation in the control
cabinet. It must always be mounted vertically.
A Braking Module is assigned its own dedicated braking resis-
tor. The Braking Module is connected to the DC link by means of
flexible cables.
The Braking Module has the following interfaces as standard:
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DC link connection
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Connection for braking resistor
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1 digital input (inhibit Braking Module/reset error)
•
1 digital output (Braking Module faulty/ready)
A switch is provided for adjusting the activation threshold.
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Integration
Connection example of a Braking Module
Braking Module
Braking resistor
G_D011_EN_00402
Connection of braking
resistor
Inhibit/Reset
Ready
Connection to DC link
X2
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© Siemens AG 2017