Siemens SINAMICS PERFECT HARMONY GH180, Function Manual

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5.2 Non-user Accessible Interfaces
5.2.1 System Inputs and Outputs for Motor Control
The drive must have feedbacks from the system under control to function properly. Due to the
wide range of input voltages and currents, and due also to the dangerously high levels of both
input and output signals, interposing sensors are used to scale the signals to a safe and usable
level in the control cabinet, and present them to the controls. These are composed of input and
output voltage attenuators, input current transformers (CTs), and output Hall Effect sensors.
Detailed information, including values and locations of sensors, is described in the Operating
Instructions Manual for the specific system.
The signals are scaled in such a way as to present the same control level signals independent of
the source levels. This allows for a unitless control algorithm that is consistent in response from
application to application, since the rated values are entered once for the inputs, and the drive
responds in a similar fashion to scaled per unit signals. This is known as a normalized system.
System Interface Board (SIB)
In the Control, a System Interface Board (SIB) that is external to the Digital Control Rack
(DCR) provides connectivity of these signals into the control.
Figure 5-1 System Interface Board
The SIB connects via cable to the main control board in the control rack. The SIB also contains
several user connections. These are:
• Isolated encoder interface for a typical quadrature, optical encoder, interface type HTL. Refer
to Section Encoder Interface.
• Trip/permissive to close drive main input line power contactor/circuit breaker M1. Refer to
Section Dedicated I/O for Type 5 and Type 6 Pre-charge.
Hardware User Interface Description
5.2 Non-user Accessible Interfaces
Control Manual
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Operating Manual, A5E50491925A