Operating instructions

21115144_en_310310 © Demag Cranes & Components GmbH

6.4.2 Emergency limit switch

6.4.3 Adjustment of the emergency

limit switch actuator

For operation of the D-SH hoist with the D-Grip, an external emergency-stop de-

vice must be fitted. It is applied on terminals X2.1 and X2.2 of the analogue PWM

converter (see section 7.6).

If no emergency-stop switch is used, terminal X2.1 and X2.2 must be jumpered.

Commercially available emergency stop switches or the switches offered as an op-

tion (mushroom-head pushbutton/trip-wire switch) may be used.

It is useful to determine the position of the emergency stop device in line with the

specific system, e.g. integrated in the operating elements of a load handling at-

tachment or of a lifting mast.

The emergency limit switch is located in the terminal box of the D-SH hoist. It

automatically switches off the D-SH hoist when the top or bottom hook position is

reached. The direction of movement can be reversed. The emergency limit switch

must not be approached in normal operation.

To avoid damage to the D-SH hoist and to prevent accidents, the emergency limit

switch stops must be properly adjusted. Check the switching rod for smooth opera-

tion. Caution when the D-SH hoist is freshly painted. The limit switch stops for the

emergency limit switch actuator on the switching rod are set by us for the maxi-

mum hook path. They must be re-set for your operating conditions. To do this, the

two limit switch stops can be moved on the switching rod towards the rope drum

centre.

42579244.eps

Limit switch stop for bottom

hook position

Limit switch stop for top hook

position

6.4.1 Emergency stop connection

Setup (D-grip)

NOTE

The limit switch stop for the bottom hook position must be set so that it is lower

than the lowest point of the working area.

NOTE

If you want to set the maximum possible lifting height for your specific operat-

ing conditions, the following must be observed:

The motor-side limit switch stop for the top hook position must be set so that

when it switches off the lifting movement, the distance between the top edge

of the rope socket and the bottom edge of the rope guide or the next obstacle

is at least 10 cm.