Poznámky redaktora
5 times the setting current. The values
for the ratio pick-up current rated current and the shortest time are crucial, and these
must specified the PTB Approval Certificate and the otor‘s rating plate. +55 °C.3 .5 the cables are looped through twice; the figures are 43.6 for looping the
cables through three times. for frequent starting and braking. See the adjacent curve for the extended range
of -25 resp. Higher switching
frequencies are permitted the duty ratio and the motor starting time are allowed for and the
m otor‘s making current does not appreciably exceed times the rated operating current. This achieved looping the cables through several times.
Description
• itching frequency
Thermal overload relays cannot operated any arbitrary switching frequency order avid
tripping.
• Special version EEx otors
Relays T7DM, TA25DU .. Please refer
to the adjacent diagram for guideline values for the permitted switching frequency..
For instance: T450TU/SU with setting range 130 .Thermal overload relays T. Tripping occurs <1.
This design means that tripping occurs between and +40 within the
ranges defined IEC 947-4-1..
Exam ple :
Tripping -25 °C.
TA25... They have been
tested and approved the erm National Standards Laboratory“ (PTB) Braunschweig,
Germany. 185 also suitable for currents of
65 .
C ondition delivered :
Manual reset.e..
• Exam ple ita ility overload relay T/TA:
The motor with increased safety has the following data:
Output 7. The relay must trip
within the time, i. TA450DU/SU are suitable for protection EEx motors.
When selecting the overload relay, check suitability the basis the tripping curves.
Example: Starting time the motor: second
Duty ratio: %
means permitted switching frequency max.. Applications involving operations per hour are acceptable.. 61.5 kW, Ia/In 7..
Ambient temperature
ABB STOTZ-KONTAKT GmbH 17
2CDC 106 014 C0203
. The relay may also used
for lower motor rated currents. 92..4 time seconds. the tripping curve, starting from cold state, must run below the coordinate point
Ia/In and the time.. TA450DU/SU feature convertible Manual/
Automatic reset.
•R eference num bers the PTB:
Type Reference No. TA45G PTB ATEX 3045
TA42, TA75, TABG PTB 02-32056
TA11G, TA2GG PTB 02-32057
TA45G PTB 02-32017
Limit values for tripping ambient temperatures other than °C
A bient tem perature com pensation :
The overload relays are protected against influences ambient temperature
by bimetallic compensation element which detects the ambient temperature. operations per hour
Use the CUSTORAPID® motor protection recommended for higher switching frequencies and
alternating loading, e.
• rotection ith heavy starting
Relays T450SU can used for particularly severe starting conditions.
In accordance with the adjacent tripping curve, the tripping time lies below the time the motor.
R t:
Types E16DU, T7DU, TA25DU .g.. The setting ranges specified
on Pages and apply non-recurrent looping through the cables.. The
setting range specified the rating plate inversely proportional the number cables looped
through. Use combination thermal overload
relays and CUSTORAPID® recommended the case locked rotors motors with thermally
critical rotors.
The special relay version for EEx motors differs from the normal version follows:
• Special the tripping tim the rks
• Special order code
Tripping curves for the individual setting ranges and the PTB Approvals Certificates may ordered
