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2. Mounting
Softstarter unit:
The softstarter must be mounted so that the cooling air passes vertically over the heat sink. It must
also be placed so that the cooling capacity is not decreased due to pollution or similar.
Open type softstarters are to be mounted in a cubicle or other enclosure. Hole configuration
according to information given on the dimension prints.
For installations there is a need to ventilate the enclosure
When a "sealed" enclosure is requested and when not using a by-pass contactor, the size must be
such that the heat generated by the thyristors can be carried off from the enclosure surface without
the enclosure's inside temperature becoming too high.
Ventilated enclosures can be considerably smaller. The size depends entirely on the ventilation and
must be determined for each individual case.
Type
Rittal type
B
H
P
Air flow capac. fan 2)
PS D75...145
AE1376
600
760
350
105m³/h/90CFM
PS DH30...110
AE1376
600
760
350
105m³/h/90CFM
PS D175...300
AK1648
800
1200
400
285m³/h/105CFM
PS DH145...250
AK1648
800
1200
400
285m³/h/105CFM
PS D370...570
PS4804
800
2000
400
285m³/h/105CFM
PS DH300...470
PS4804
800
2000
400
285m³/h/105CFM
PS D720...840
PS4804
800
2000
400
570m³/h/270CFM
PS DH570...720
PS4804
800
2000
400
570m³/h/270CFM
The ambient temperature outside the softstarter must not exceed 50
°
C.
The losses generated in a softstarter, at rated operational current, are given in the technical data,
see section 7.
Semiconductor fuses
The semiconductor fuses are not delivered built in the starter unit.
Use the recommended fuses given in the technical data. The combination fuse size and softstarter
allows the maximum use of starting time and current given for each softstarter without tripping.
Two alternatives are listed; Bussmann and Ferraz. See technical data, section 7.
Overload relays
The PS D version is possible to buy without built-in electronic overload relay. For this version we
recommend you to use the ABB T...DU relays. This relay will protect both the motor and the
softstarter from over-heating during start and continuous run.
Recommended relay, see technical data, section 7.
By-pass
By-pass contactors are not delivered built in the softstarter unit. We recommend you to use the ABB
type contactors. The by-pass contactor can be selected according to data for AC-1, using the rated
motor current used, if the making and breaking capacity is higher then locked rotor current for the
used motor, if it is a maincontactor selected according to data for AC-3. The signal relay T.O.R (K5)
built in the softstarter can be used to operate the by-pass contactor. The contactor will then be
closed during continuous run and no current will pass through the softstarter even if the softstarter is
still running. When stopping the softstarter, the by-pass contactor will open and the softstarter takes
over and makes a soft stop. See diagram for connections in chapter 3.
When using a by-pass contactor bigger than EH300 we recommend to use a relay contactor
between the signal relay K5 and the coil of the by-pass contactor.
