9
ABB STOTZ-KONTAKT
2CDC 106 011 M5701
Thermal overload relay T 900 DU V1000
According to IEC/EN 60 ... 947-1/-4-1/-5-1 for low-voltage switchgear,
Directive 94/9/EG for explosion-protected areas,
EN 60079-14 for electrical equipment for gas explosion endangered areas
General description
The thermal overload relay with linear converter T 900 DU V1000 is available in 4 different current ranges: 265 - 850 A.
The triggering function is ensured by 3 current-dependent, delayed overload triggers on bimetal basis, which are operated by
linear converters.
The thermal overload relay can be set to the consumer rated current by a adjustment knob on the front.
The reset after a release is selectable between hand (Man) and automatic reset (Aut). The manual control reset button can
also be used to turn off.
The settings R and RO can be selected:
R
Only reset
RO Reset and turning off in special operation situations,
e.g. with a motor starter and contactor combination, test function circuit
Safety note:
The device may only be operated with setting manual reset in applications for the protection of
motors in the EEx e range, since the motor can restart automatically after a release in the setting
automatic reset and thus cause damages to persons or property.
Transport, storage
•
ABB overload relays are accordingly packed ex factory for the in each case agreed upon transport mode.
•
Avoid blows and impacts.
•
Pay attention to possible damage of the packing or of the device.
•
Store the device dry and weather-protected.
•
Protect the device against dirt.
Installation
Mounting, electrical connection and start-up are only to be done by trained technical personnel. Adhere to the unit-referred
conditions and specifications of the manufacturer. In the case of violation the protection of the explosion proof motor/consumer is
no longer upright.
Devices of the series T 900 DU are suitable for attachment to ABB contactors ABB EH550, EH700 and EH800.
Detailed information on the individual combinations can be found in the co-ordination tables. These are available on the Internet. To
connect insert the angle brackets into the contactor clips, hook up the plastic hooks and tighten the locking screws.
Test before commissioning
Press reset – and switch off button for resetting of relay.
By pressing the test release slide, the device trips.
The contact 95-96 opens, the contact 97-98 closes.
Red contact position indicator indicates off position.
Operation
•
Setting of the motor rated current on the front adjustment knob. Adjust the desired rated current value on the head
of the arrow.
•
The tripping period at the coordinate points I
A
/I
N
(motor starting current ratio) must be smaller than heating up
period t
E
of the motor. Whether this requirement is fulfilled, must be examined using the tripping characteristic.
The appropriate tripping characteristics are contained in this documentation. They can also be requested from the
manufacturer.
•
Motors for heavy starting (ramp-up time > 1.7 x t
E
–time) are to be protected according to the specifications of the
EEC Design Test Certificate for EEx e - motors by start up monitoring.
•
All 3 main current paths must be flowed through by current, in order to achieve the indicated equipment characteristics.
•
Operate only in closed areas without less favourable operating conditions (e.g. dust, corrosive steams, damaging
gases).
•
Suitable encapsulations are to be foreseen in dusty and damp rooms.
•
In the case of Ex applications proof of the effectiveness of the installed protection devices is required before start-up!
When selecting the overload relay, the suitability is to be examined with reference to the tripping characteristics. The values for
the ratio starting current I
A
to rated current I
N
and the shortest t
E
- time, which must be noted in the PTB certificate of conformity
or in the EEC - design certificate and on the name plate of the motor. The relay must trip within the t
E
- time, i.e. the tripping
characteristic from the cold condition must be below the coordinate point I
A
/I
N
and the t
E
- time.
E
Summary of Contents for T 900 DU V1000
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