Figure 2.4: Voltage Selection (240V or 110V)

2468CB & 2468CD Dual Power Supply Version

Hydrastep 2468CB and 2468CD Manual

6.With power disconnected release voltage selection plug PL9 by squeezing lugs. Insert appropriate selector plug.

7. Remove fuse and fit 200mA ceramic anti-surge fuse for 240Vac nominal and 400mA ceramic anti-surge fuse for 110Vac nominal.

The Hydrastep 2468C unit must be earthed via the protective earth terminal (stud) on the enclosure. The cable or braid used to attach the unit to the protective earth must be capable of carrying a current of at least 10A. No disconnecting device should be fitted to the protective earth conductor.

Voltage Selection Plug

(Set to 240V)

Fuse

 

L

 

N

TRANSFORMER

 

Voltage Selection Plug

(Set to 110V)

Fuse

 

L

 

N

TRANSFORMER

 

(A) 240V

(B) 110V

Figure 2.4: Voltage Selection (240V or 110V)

DC Powered Units (input board 24680516)

A shielded power cable, and shielded signal cables with the connection to the unit through RF glands mounted on the gland plate should be used for all units that need to comply with the requirements of the European EMC Directive. The supply is connected to the unit in the same way as for the AC version. A ferrite (supplied) must be attached inside the enclosure for each DC inlet (with a double-turn). The DC inlet must not be shared by signal wiring for any other purpose. Route the supply wires in twisted pairs as described in the AC section.

The DC supply must be either negative earth of fully isolated from plant ground

1.Positive (+Vs) is connected to the terminal marked L.

2.Negative (-Vs) is connected to the terminal marked N.

3.A separate ground wire is required which must be connected to the earth stud on the enclosure.

4.For a non-isolated supply, the maximum difference between the plant earth at the water column and the -Vs supply is 7V.

5.Use a good quality RF cable gland, and ensure there is a good annular (ring shape) connection with the screen.

The Hydrastep 2468C unit must be earthed via the protective earth terminal (stud) on the enclosure. The cable or braid used to attach the unit to the protective earth must be capable of carrying a current of at least 10A. No disconnecting device should be fitted to the protective earth conductor.

2-14

24685034

Page 34
Image 34
Emerson 2468CB, 2468CD manual 2-14, DC Powered Units input board, 4 Voltage Selection 240V or