577368

Benning ST 750A Manual

18
Zoom out
Zoom in
Previous page
1/58
Next page
08/ 2012 18 / 58
BENNING ST 750 A
10. Carrying Out Manual Measurements / Tests
First of all, each test begins with an inspection of the test object. Moreover, it has to be determined
which protection class (protective measure) the test sample corresponds to and which tests / mea-
surements (VDE regulation, manufacturer's accompanying documents, depending on the type of
the test sample) have to be carried out. The order of the individual measurements (tests) has to be
observed absolutely, because the measurement has to be stopped immediately in case of a failed
test. Only after troubleshooting, the test can be repeated right from the beginning.
Order of the individual test steps:
- Visual inspection
- Protective conductor test (if the protective conductor exists)
- Insulation measurement (if technically possible)
- Measurement of leakage current, protective conductor current and / or contact current
- Moreover: safe isolation; proof of further protective measures; inscriptions; functional test;
analysis, evaluation and documentation
If it is not directly possible to isolate the test sample from the electrical systems, proceed as follows:
- visual inspection
- protective conductor resistance measurement for devices of protection class I and
- contact current measurement on accessible protective parts of devices of protection class II
as well as on accessible parts of devices of protection class I which are not connected to the
protective conductor!
The respective test steps and measuring types depend on the type of the test
sample!
Visual inspection
Important parts of the device contributing to its safety must neither be visibly damaged nor be obvi-
ously inappropriate for the device. This particularly applies to insulation and insulating parts which
areaccessibleduringrepair,modicationortestaswellasforhousingsofdeviceswithprotective
insulation (protection class II).
Examples for the application of visual inspections are:
- Melt inserts of fuses must comply with the parameters requested by the manufacturer (e.g.
nominal current intensity and fusing characteristics);
- Airlters(ifrequested)mustbebuiltin;
- Cooling apertures must not be blocked;
- Protective covers requested by the manufacturer must be used and must be attached in proper
condition and in due form;
- Coolingnsmustnotbeblocked;
- The markings provided by the manufacturer, particularly those contributing to safety (warning
symbols, characteristic data on fuse holders, switch positions on isolator switches and similar),
must be available and perfectly legible. If necessary, markings have to be corrected after modi-
cations.
- Mains connection cables (also enclosed device connecting cables) must not show any external
defects between the connecting point of the device and the connecting point of the mains;
- Strainreliefandbendingprotection(ifapplicable)ofthemainsconnectioncablemustbermly
attachedandefcient;
- There must not be any signs of overload or improper use;
- Itisnotallowedtomakeanyimproperinterventionsandmodications;
- Any contamination and corrosion affecting safety must be removed by cleaning.
At the beginning of a test (after requesting the corresponding VDE regulation and protection class),
the"VisualInspection"menuappearsonthedisplay.Conrmwith<OK> to continue with the test!
The tester is provided with a switchable test socket to contact the test sample. The additional test
sockets"L/N"areonlyconnectedin"TestSocket"mode.The"PE"testsocketisrmlyconnected
with the earthing contact of the test socket. For measurements to earth (test samples of protection
classes II) and for direct measurement of the leakage current, a measuring shunt in the milliohm
range is integrated into the cable for PE connection. Due to a correspondingly required measuring
arrangement,the"Sonde/Probe"jackisintendedformeasuring/testingtheabsenceofvoltageor
the contact current etc. according to DIN VDE 0701-0702.
For measuring device leakage current or for the patient leakage current etc. according to DIN VDE
0751,thespeciedmeasuringarrangement"MD"(DINVDE0751-1)isconnectedtothesamejack
("Sonde/Probe").
For this reason, it is absolutely necessary to preselect the correct VDE regulation
for the measurements / tests!
Connection test
Forthersttest/measurement,thetesterstartsaconnectiontesttodetermine,whetherdangerous
contact voltage is applied, whether a test sample is connected and that there is no short-circuit. After
a positive connection test, the measurement is started. In case of a negative connection test (e.g.
open switch), an information message is displayed. Another connection test will only be started
whenthe"VisualInspection"menuhasbeenpassedthroughonceagain.
Attention! Pressing the <Pause> button will stop the measurement. During the pause,
the test socket will remain live!
10.1 Protective Conductor Test (Protective Conductor Resistance) R
PE
This function is intended to measure the protective conductor resistance R
PE
(devices of protection
class I). Measurement is made with a testing current of +/- 200mA DC according to DIN VDE 0701-
0702, VDE 0751-1 or a testing current of 10A AC (formerly: DIN VDE 0701 T260). For measuring,
the test cable (probe) is connected to accessible metal parts of the test sample and to the earthing
contactofthemainsplugbymeansofthealligatorclip.Connectthemainsplugtothe"testsocket"
oftheappliancetester.Ifnecessary,usethemeasuringjacks"PE"and"L/N"whichareconnected
inparalleltothe"testsocket".
… 18 …


Need help? Post your question in this forum.

Forumrules


Report abuse

Libble takes abuse of its services very seriously. We're committed to dealing with such abuse according to the laws in your country of residence. When you submit a report, we'll investigate it and take the appropriate action. We'll get back to you only if we require additional details or have more information to share.

Product:

For example, Anti-Semitic content, racist content, or material that could result in a violent physical act.

For example, a credit card number, a personal identification number, or an unlisted home address. Note that email addresses and full names are not considered private information.

Forumrules

To achieve meaningful questions, we apply the following rules:

Register

Register getting emails for Benning ST 750A at:


You will receive an email to register for one or both of the options.


Get your user manual by e-mail

Enter your email address to receive the manual of Benning ST 750A in the language / languages: English as an attachment in your email.

The manual is 7,87 mb in size.

 

You will receive the manual in your email within minutes. If you have not received an email, then probably have entered the wrong email address or your mailbox is too full. In addition, it may be that your ISP may have a maximum size for emails to receive.

Others manual(s) of Benning ST 750A

Benning ST 750A User Manual - German - 68 pages


The manual is sent by email. Check your email

If you have not received an email with the manual within fifteen minutes, it may be that you have a entered a wrong email address or that your ISP has set a maximum size to receive email that is smaller than the size of the manual.

The email address you have provided is not correct.

Please check the email address and correct it.

Your question is posted on this page

Would you like to receive an email when new answers and questions are posted? Please enter your email address.



Info