89750147 Crouzet USA, 89750147 Datasheet - Page 33

• Manufacturer Part Number: 89750147
• Description: STAINLESS SLEEVE-MILL TEMP PRB
• Manufacturer: Crouzet USA

Specifications of 89750147

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

A timer is a control component which, after a preset time,
energises an output contact.
The start of a timing cycle, single or repetitive, is produced by
timer energisation or by maintained or pulse control contacts with, as a
result, a large number of potential functions.
There are two types of presentation:
➜ DIN rail mounted
Product designed for mounting within a control panel.
➜ Panel-mounted
Product designed to be fitted on a panel in order to be accessible
by the user.
There are two types of output:
Timed contacts dependent on the value of the set time.
Instantaneous contacts operating simultaneously with the energisation
or de-energisation of the product in instantaneous fashion (excluding cer-
tain cases, for example: memory).
➜ Note:
Electro-mechanical timers with automatic reset are fitted with:
■
■
Timers with manual reset require "manual" intervention for the
commencement of a new cycle which involves resetting the
timing selector.
➜ Minimum control contact time
This is the minimum pulse time required to effect timing control.
➜ Reset time (or return)
This is the time required at the end of a cycle for resetting the
timer to start a new cycle.
➜ Accuracy
This is the maximum difference between the selected and the
actual timing of the cycle chosen.
It is expressed as a percentage of the maximum value of the
timing range considered within normal operating parameters.
➜ Maximum operating current
This is the maximum uninterrupted current at which the timer
may function permanently within normal operating parameters
when the timer contact is closed.
➜ Thermal intensity
Current limit in continuous duty for a circuit with the highest possible level
of current which a previously closed contact circuit can tolerate at all
times in specified conditions.
➜ Contact rating
This is the value of the current that can be switched by a contact
www.crouzet.com
Basic principles
Timers
Definitions
either a standard clutch : during timing, the electro-clutch is
energised
or a reversed clutch : during timing the electro-clutch is de-energised.
in certain specified conditions.
Insulation to standard VDE 110 group C, IEC 255.5 and
IEC 664
Spécifications pour le dimensionnement des lignes de fuite et distance
dans l'air du matériel électrique.
➜ Protection
To IEC 529: classification of the levels of protection obtained by
casings, terminal
■
■
➜ Protection from voltage surge
This protection is designed to eliminate voltage peaks generated
varistor, the capacity of which is expressed in joules.
Example:
2 joules = 5000V x 400 A x 1µs
For circuits with strong electrical interference (over 2 joules) the
user should ensure adequate protection.
➜ Electromagnetic compatibility
Electromagnetic compatibility tests measure the degree of
immunity which a piece of equipment shows to various types of
disturbance as defined in IEC standards.
➜ Quality control
Our products are quality controlled systematically during
assembly and on completion. The overseeing of control checks
in the workshop, the use of collected data and any resulting
product assessments form the essential role of Quality Control.
All our products undergo a final check, either 100% or on a
selective basis according to French standard X 06-022, which
provides for a classification of possible defects in three groups :
critical, major, minor.
➜ Note:
According to customer requirements and for certain product
ranges which must meet particular requirements expressed in a
specification, it is always possible to create or to modify a quality
to vary the level of inspection. It can happen that the tolerance
level is set at zero for certain parameters directly linked to the
completion of a function for which total success must be assured:
a defect is therefore fatal. Such specific requirements do, however, entail
a significant increase in product costs.
Controls
against solid matter
against liquids
by the industrial environment. It is generally provided by a
standard on the basis of a normal or special existing product and
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