Connecting The Firing Pulse Transformers; General Information; Normal Use (Individual) - Siemens SINAMICS DCM Operating Instructions Manual

Connecting

6.7 Connecting the firing pulse transformers

6.7 Connecting the firing pulse transformers
6.7.1

General information

The 12 firing pulse drivers for the firing pulse transformers are located on module A7109.
The firing pulses for the first torque direction can be accessed via connector X21A and those
for the second torque direction via connector X22A. Each firing pulse driver has an open
drain output with a parallel diode downstream of the electronic ground. A further diode
discharges shutdown overvoltages internally downstream of P44 (+44 V). The 12 firing pulse
transformers (containing 33 Ω series resistors) are located on module A7043. Each is
connected between P24 and the firing-circuit cable. Each of the 12 firing pulse drivers can
control up to 3 firing pulse transformers (containing 33 Ω series resistors) in parallel. There is
no short-circuit protection! The user is responsible for ensuring the outputs are not
overloaded. The maximum power pulse current at each of these outputs is 2.5 A. The circuit
as a whole is dimensioned for long pulses.
6.7.2

Normal use (individual)

Connectors X21A and X22A are connected with the connectors of the same name on
module A7043 via two 26-pin ribbon cables. The firing pulse transformers on the module with
the same name are then connected. It is only necessary to use the ribbon cable for X21A for
operation with just one current direction. If module A7043 has not been divided (broken up),
each firing pulse transformer must be connected with the terminal strip via two twisted
cables.
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SINAMICS DCM Control Module
Operating Instructions, 06.2010, C98130-A7067-A1-02-7619