System Description - Bosch Rexroth LTH Technical Information Manual

3 609 929 408/2.1 | LTH
2.2

System Description

Power unit LTH is a frequency converter for EC motors. By means of the built-in intermediate voltage cir-
cuit/frequency converter, a rotary field for EC motors is generated which is variable in power and frequen-
cy.
The isolation transformer in the LTH power unit electrically isolates the power tool system from the power
line. Temperature sensors in the power tool motor winding and on the heat sink of the power unit prevent
possible damage caused by overloading.
The insertion and programming of an optional current control board allows the power unit to operate as
an independent power tool system.
The integrated interfaces X2, X7 and X8 allow the connection to an external power tool control (e.g.
SE200).
Fig. 2:
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NI0-QUITT
EC 37
EC 48
MOTOR
RESET
OFFSET T n
GAIN I m
BTB
FG LI
FGI ST1
PV ST2
FI ST3
BL TF
Front View
Electric Drives and Controls | Bosch Rexroth AG
LTH
PROGRAMM
EXTERN
0
USP TFVM
NTF BTBVM
37/60
2 Power Unit LTH