Insulation Monitor (Option L87) - Siemens SINAMICS S150 Operating Instructions Manual

4.9.14

Insulation monitor (option L87)

Description
The device monitors the entire 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 and 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.
Note
When the insulation monitor is used, the connection bracket for the interference-suppression
capacitor must be removed (see "Electrical installation / Removing the connection bracket for
the interference-suppression capacitor with operation from an ungrounded supply").
NOTICE
Only one insulation monitor can be used in an electrically connected network.
Connection
Table 4-37 Terminal block A1-A101 – connection for an insulation monitor
Terminal
11
12
14
21
22
24
M+
M-
R1
R2
T1
T2
Max. connectable cross-section: 2.5 mm² (AWG 12)
Drive converter cabinet units
Operating Instructions, 07/07, A5E00288214A
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 otherwise the fault code is not stored)
External reset key (NC contact or wire jumper)
Technical specifications
External test button
External test button
Electrical installation
4.9 Other connections
89