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

6.7

Connecting the firing pulse transformers

6.7.1 General information
The twelve firing pulse drivers for the firing pulse transformers are located on the "Power
interface for the Control Module" module. 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 twelve firing pulse transformers (containing 33 Ω series
resistors) are located on the "Firing pulse transformer module". Each is connected between
P24 and the firing-circuit cable. Each of the twelve firing pulse drivers can control up to three
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.
Note
Restriction regarding dismantling in conjunction with functional safety
In conjunction with the use of functional safety, it is not permissible that the firing pulse
transformer module is removed.
6.7.2

Normal use (individual)

Connectors X21A and X22A are connected with the connectors of the same name on the
"Firing pulse transformer module" 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 the "Firing pulse
transformer module" has been divided (broken up), each firing pulse transformer must be
connected to the terminal strip via two twisted cables.
SINAMICS DCM Control Module
Operating Instructions, 12/2018, A5E34888669A
6.7 Connecting the firing pulse transformers
Connecting
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