ABB ACS850-04 Hardware Manual page 25

Frame (size)
FSCA-01
HTL
IGBT
I/O
JCU
JGDR
JINT
JMU-xx
JRIB
STO
SynRM
RFI
TTL
Size of the drive module. The drive modules described in this manual are
of frame size G1 and G2.
Optional Modbus adapter
High-threshold logic
Insulated gate bipolar transistor; a voltage-controlled semiconductor type
widely used in converters due to their easy controllability and high
switching frequency.
Input/Output
The control unit of the drive module. The external I/O control signals are
connected to the JCU, or to optional I/O extension modules mounted on it.
Gate driver board
Main circuit board
The memory unit attached to the control unit (JCU)
Adapter board connected to the control board in the control unit (JCU)
Safe torque off
Synchronous reluctance motor
Radio-frequency interference
Transistor-transistor logic
Introduction to the manual
25