Environmental Conditions and Fault Finding Checklist

What Environmental Conditions Apply?
You should ascertain the conditions which prevail where the starter is to be located, i.e. the level of dust in the atmosphere and the likelihood - if any - of contact with water.

The table defines International Protection (IP) ratings appropriate to various environmental conditions. ADS7 metal enclosure starters are rated IP54 which indicates protection against ingress of dust and splashing liquid from any direction. This ensures that the range is perfectly acceptable in the vast majority of applications. However, should a d.o.l. starter be required for a very dusty location (say, a flour mill) or one where sprayed water is frequently encountered (garden centre, green house, car wash), then an IP65 ADS7 moulded enclosure starter should be used.

With regard to ingress of solid foreign bodies indicated by the first characteristic numeral, BS EN 60529:1992 differentiates between protection of the equipment inside the enclosure and personal protection against contact with live parts. Thus IP3X indicates protection of enclosed equipment against ingress of a solid object greater than 2.5mm diameter or thickness; while IP3XD protects the person against contact by a 1mm diameter test probe no longer than 100mm although solid foreign bodies not exceeding 2.5mm diameter can still enter.
(see diagram)

The second characteristic numeral indicates the degree of protection of enclosed equipment with respect to harmful ingress of water. IP rating tables are detailed here.

Coil Voltage
Coils in Eaton MEM starters comprise contactor coils in the case of automatic starters; and no-volt release coils where these are fitted to manual starters. Standard coils are usually rated either 220/240V or 380/415V, 50Hz. On 3-phase, 415V systems, the coil is usually connected between the supply lines. Therefore, a 380/415V coil is required. ADS7 380/415V coil starters are ready-wired in this way. Where other components in a more complex control scheme require use of a 240V coil, a 220/240V coil starter should be selected. In this case, the control circuit must be wired to ensure that the coil circuit operates between one phase and the neutral.

Starters Less Overloads
ADS7 starters are supplied without overload relays which should be selected separately to suit the application.

Selection of starter and appropriate overload (see below) is very simple and once again merely requires voltage, f.l.c. and kW rating to be established from the motor rating plate.

Ideally an overload relay should be selected whose current scale corresponds at its upper end with the motor f.l.c. It can this be adjusted downwards to the motor's running current if this is known. However, adequate protection is obtained if the overload relay's scale pointer is set to the motor f.l.c.

Fault Find Checklist
Experience has shown that complaints about starter malfunction usually stem from incorrect installation or the easily-rectified results of rough handling, transit shock, etc. A selection of the most frequently encountered symptoms and their remedies is given below. It is assumed that testing will be carried out by a competent electrician.

*Where possible, select current range to correspond with the motor nameplate rating. kW and hp figures are typical only and may not apply to all types of motor.

Typical Diagrams for 3-phase, single phase and DC Operation