Maintenance; Securing The Unit - Benning CM 12 Bedienungsanleitung

The three-phase network system does not have to be earthed!
See figure 8:
8.10 Current measurement with the flexible AC current transformer
BENNING CFlex 1
- Select the desired function
BENNING CM 12.
- Connect the black safety measuring line of the BENNING CFlex 1 to the
COM jack O at the BENNING CM 12.
- Connect the red safety measuring line of the BENNING CFlex 1 to the + jack
P at the BENNING CM 12.
- Select the 3,000 A (1 mV/A) measuring range at the AC current transformer
BENNING CFlex 1.
- Clamp the single-wire live conductor centrally by means of the flexible meas-
uring loop 1 .
- Read the measurement value displayed in the digital display J .
See figure 9:
8.11 Voltage indicator (NCV)
The voltage indicator function is not intended for testing the ab-

sence of voltage. Even without an indication signal, a dangerous
contact voltage might be applied. Electrical danger!
The voltage indicator function is intended for non-contact detection of an alter-
nating field. The detector is located in the measuring clamp 1 and is active as
soon as the function
localized, the red LED 3 lights.
An indication is made in earthed AC current networks only!
Note:
In the function
cator (NCV) is not active!
Practical hint:
Interruptions (cable breaks) in cables lying around openly such as e.g. cable
reels, fairy lights etc. can be traced from the feeding point (phase) to the point
of interruption.
Functional range: ≥ 230 V
See figure 10:
9.

Maintenance

Before opening the BENNING CM 12, make sure that the device

is free of voltage! Electrical danger!
Working on the opened BENNING CM 12 under voltage must be carried out by
skilled electricians with special precautions for the prevention of accidents
only!
Before opening the BENNING CM 12, remove it from all sources of voltage as
follows:
- First remove the both safety measuring leads from the measurement points.
- Remove both safety measuring leads from the BENNING CM 12.
- Turn the rotating switch 5 to "OFF".

9.1 Securing the unit

Under certain circumstances, the safety of the BENNING CM 12 can no longer be
guaranteed. This may be the case if:
- there are visible signs of damage on the unit,
- errors occur in measurements,
- the unit has been stored for a long period of time under the wrong conditions,
and
- if the unit has been subjected to rough handling during transport.
In these cases, the BENNING CM 12 must be switched off immediately, removed
from the measuring points and secured to prevent it from being used again.
9.2 Cleaning
Clean the outside of the unit with a clean dry cloth. (Exception: any type of special
cleaning cloth). Never use solvents or abrasives to clean the testing unit. Ensure
that the battery compartment and the battery contacts have not been contami-
nated by electrolyte leakage.
If any electrolyte or white deposits are seen near to the battery or in the battery
compartment, remove them with a dry cloth, too.
08/ 2018
Phase sequence indication
Current measurement with the flexible AC current transformer
BENNING CFlex 1
, or
or INRUSH, phase sequence test (RST), the voltage indi-
Voltage indicator with buzzer
BENNING CM 12
by means of the rotary switch 5 of the
has been selected. If a phase voltage is

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