ABB TU838 After sales service is provided for the control card of the power supply device

Description

Packaging details: if you need an urgent delivery order, please feel free to contact us, and we will do our best to meet your needs.

Price problem: if you find that other suppliers offer cheaper prices for the same product, we are also willing to provide you with reference prices and give you further discounts.

where Tp is the cold trip time of the thermal release at 7.2 times the set current
value (for example: a release in class 10 at 7.2 times the set current value must
not trip within 4 s, but must trip within 10 s).
It is normal procedure to associate class 10 with a normal start-up type, and
class 30 with a heavy duty start-up type.
Coordination type
Type 1
It is acceptable that in the case of short-circuit the contactor and the thermal
release may be damaged. The starter may still not be able to function and must
be inspected; if necessary, the contactor and/or the thermal release must be
replaced, and the breaker release reset.
Type 2
In the case of short-circuit, the thermal release must not be damaged, while the
welding of the contactor contacts is allowed, as they can easily be separated
(with a screwdriver, for example), without any significant deformation.
In order to clearly determine a coordination type, and therefore the equipment
necessary to achieve it, the following must be known:
• power of the motor in kW and type;
• rated system voltage;
• rated motor current;
• short-circuit current at installation point;
• starting type: DOL or Y/∆ – normal or heavy duty – Type 1 or Type 2.
The requested devices shall be coordinated with each other in accordance with
the prescriptions of the Standard.
For the most common voltages and short-circuit values (400 V – 440 V – 500 V –
690 V 35 kA – 50 kA) and for the most frequently used starting types, such as
direct starting and Star/Delta starting, for asynchronous squirrel-cage motor
(AC-3), ABB supplies solutions with:
• magnetic circuit-breaker – contactor – thermal release;
• thermomagnetic circuit-breaker – contactor;
• circuit-breaker with Ekip M LIU-LRIU or PR222MP electronic release – contactor.