Insulation Monitor (Option L87)) - Siemens SINAMICS G150 Operating Manual

Electrical Installation
4.9.13

Insulation Monitor (Option L87))

Description
This device monitors the complete electrically connected circuit for insulation faults.
The insulation resistance as well as all the insulation faults that occur in the DC link
and on the motor side of the cabinet are detected. Two response values (between
1 kΩ ...10 MΩ) can be set. If a response value in undershot, a warning is output to
the terminal. A system fault is output via the signaling relay system.
When the cabinet unit is delivered from the plant, the plant configuration (one or
several loads in one electrically connected network) and the protection philosophy
(immediate shutdown in the event of an insulation fault or restricted continued
motion) can vary. This means that the signaling relays of the insulation monitor are
not integrated in the fault and warning train. These relay outputs would have to be
integrated in the fault/warning train of the cabinet unit on the system side providing
the plant configuration and protection philosophy permit this.
IMPORTANT
Only one insulation monitor can be used in an electrically connected network.
Connection
Table 4-33
Terminal
11
12
14
21
22
24
M+
M-
R1 External reset key (NC contact or wire jumper otherwise the fault code is not stored)
R2
T1
T2
Max. connectable cross-section: max. 2.5 mm² (AWG 12)
Diagnostics
Messages output during operation and in the event of faults (meaning of LEDs) are
described in "Additional Operating Instructions" in the operating manual.
4-40
Terminal block A1-A101 – connection for one insulation monitor
Technical data
Signaling relay ALARM 1 (mid-position contact)
Signaling relay ALARM 1 (NC contact)
Signaling relay ALARM 1 (NO contact)
Signaling relay ALARM 2 (mid-position contact)
Signaling relay ALARM 2 (NC contact)
Signaling relay ALARM 2 (NO contact)
External kΩ display, analog output (0 µA ... 400 µA)
External kΩ display, analog output (0 µA ... 400 µA)
External reset key (NC contact or wire jumper)
External test button
External test button
11/03
SINAMICS G150
Operating Manual