Operating instructions

Mechanical and electrical design

0421

0422

Reverser

Construction of reverser

The reversing switch unit consists of a camshaft

(6) and a contact bank (5) with two alternating sets

of contacts and three sets of opening contact all

made of silver. The cam shaft is driven by a

synchronous motor (2) via an escapement (1). The

gears are made of durable plastic to ensure a long

life. The contact bank is made of plastic (Melamin)

resitant to current.

The reversing switch is assembled by means of a

mounting pin (8) and three spacer pins (7), which

automatically give the correct distances. To

replace the contact bank, only the mounting pin

and one spacer pin need to be removed.

Operation of reverser

During reversing, the drive motor is without current

to avoid burning contacts in the reversing switch.

This is achieved by energizing the wash motor

relay via contact 1b or 2b, by cutting out the

current 1 1/2 seconds before contacts 4 and 5

change over and not engaging the wash motor

relay until 1 1/2 seconds after changeover. See

sequence diagram. Normal reversing action 12/3,

gentle action 3/12 seconds.

Fig.