P2HZ X4P
Operating Manual P2HZ X4P
20076-EN-08
9
Function Description
The two-hand control relay P2HZ X4P is activated by simultaneously pressing the two oper-
ator elements (simultaneity see
). If one or both of the operator
elements are released, it interrupts the control command to close the press. The device is
ready for operation when the supply voltage is applied and the feedback loop Y1-Y2 is
closed. The "POWER" LED lights up.
}
Both operator elements are operated within the simultaneity:
–
Safety contacts 13-14, 23-24 and 33-34 close, auxiliary contact 41-42 is opened,
the device is active.
–
LEDs "CH1" and "CH2" will light.
}
One operator element is released following simultaneous operation:
–
Safety contacts 13-14, 23-24 and 33-34 are opened redundantly, auxiliary contact
41-42 is closed.
–
The LED "CH1" or "CH2" goes out.
}
To activate the device again, both operator elements have to be released and then op-
erated again within the simultaneity.
Operating modes
}
Dual-channel operation with detection of shorts across contacts: Redundant input cir-
cuit, P2HZ X4P detects
–
earth faults in the start and input circuit,
–
short circuits in the input circuit,
–
shorts across contacts in the input circuit.
Timing diagram
POWER
Feedback loop
Output safe
Button 1
t
0
t
1
t
2
t
3
t
3
t
1
Button 2
Output aux.
t
1
Legend
}
POWER: Supply voltage
}
Button 1/Button 2: Input circuits S11, S21, S32, S33
}
Feedback loop: Feedback loop Y1-Y2
}
Output safe: Safety outputs 13-14, 23-24, 33-34
}
Output aux: Auxiliary contacts 41-42
