Dino 210XT - Page 85

DINO 210XT
85
SR3: SAFETY RELAY WHICH MONITORS THE OVERLOADING OF BOOM
Safety limit-switch RK5 controls the operation of the safety relay.
Overloading of the boom: SR3 is disconnected. The safety relay is automatically reset upon
return to the normal outreach range. The delay adjusted with the
capacitors affects the tripping moment of the SR3.
If the RK5 fails: SR3 is disconnected. The safety relay is not automatically reset but the due
operation of the electric equipment must be checked. The delay
adjusted with the capacitors affects the tripping moment of the SR3.
SR4: SAFETY RELAY FOR EMERGENCY STOP CIRCUIT
SR4 switches off control voltage from the engine control contactors.
The safety relay operates provided that the emergency stop buttons on the upper and
lower control centres are in their upper positions and the chain limit switch RK7 is not
active. In adition the contactors K1 and K2 must be inactive.
The safety relay will trip if the emergency stop buttons either on the upper or on the
lower control centre is depressed or the chain limit switch is activated.