DEMAG DC-Com 1, Руководство по эксплуатации

Страница: 59 / 116

7.3.5 Emergency-stop device operating function
When the emergency stop is actuated, the hoist motor is immediately disconnected from the electric power sup‐
ply, the mechanical brake is applied and it brings any movement to standstill.
Operation can only be resumed by unlatching the emergency stop when no lifting or lowering commands are ap‐
plied (off-position interlock).
The effectiveness of the emergency-stop function depends on the good operating condition of the mechanical
brake. Unusually long braking distances may indicate excessive wear of the brake. In this case, the brake must
be inspected by an experienced technician without delay.
7.3.6 Slipping clutch operating function
The chain hoist is fitted with a slipping clutch that is tripped if an overload occurs. The brake is then automatically
applied and the motor is switched off. Only lowering motion remains possible after the slipping clutch has tripped.
Therefore, an overload cannot be lifted from the ground. A load that is already suspended can be safely deposited
by actuating the lowering button. When the lowering motion has been completed, lifting is possible again. If the
slipping clutch already trips at rated load, the slipping force must be measured by an experienced technician and
re-adjusted, as required.
7.3.7 Lifting path limiter operating function
Only motion in the opposite direction remains possible after the lifting path limiter has tripped. The lifting path is
limited by limit stops at the ends of the chain. Consequently, the slipping clutch acts as an emergency-stop de‐
vice, the brake is automatically applied and the motor is switched off. A warning message is shown on the display
if the emergency-stop device is tripped. Operating limit switch contacts prevent travel against the emergency limit
stop device; they are actuated by elastic buffers on the limit stop and switch the motion off before the emergency
limit stop device is reached.
The emergency limit stop device must not be tripped by DC-Com chain hoists that are not fitted with operating
limit switches.
7.4 Emergency stop
Fig. 33 Position of the emergency stop (1), DC-Com not in connection with DSM-C
214
80
2 44/291
113
59