Check Of Pressure Control Valve At The End Of Squeeze Time; Operate Force Sensor; Mirroring Of Discrete Inputs To Serial Outputs; Tip Dresser Disturbance (Input Bit 19) - Bosch Rexroth PRC 7 00-L 403-Serie Typspezifische Anleitung

R911381576 | PRC 7x00-Lx/Wx-403 Bosch Rexroth AG | Electric Drives and Controls
7.1.5

Check of pressure control valve at the end of squeeze time

A check of pressure control valve at the end of squeeze time is selectable.
7.1.6

Operate force sensor

The serial input "Operate force sensor" will be mirrored to the output "Operate
force sensor" at XGM3.
7.1.7

Mirroring of discrete inputs to serial outputs

The following discrete inputs are mirrored to serial outputs:
• E.l.c.b. tripped (linked to serial output Bit_25)
• Motor protection trip, tip dresser (linked to serial output Bit_26)
• Tip dresser supply voltage contactor (linked to serial output Bit_27)
7.1.8

Tip dresser disturbance (input bit 19)

An external monitoring give an input signal to the welding timer, if the tip dresser
not rotate despite control. The timer generate then a warning which has to be
acknowledged.
7.1.9

Proportional valve error messages (inputs bits 86 and 87)

There are two inputs, which can signalize two certain error states at an external
proportional valve:
• Proportional valve: error in regulation
• Proportional valve: voltage under 18V
For this signals there is a group signal "external error at proportional valve".
An additional information displays, which problem exist in detail (No. 1 or 2).
The timer generate after that a warning. This warning is self-acknowledging.

7.1.10 Flow protection monitoring

The output „ magnet valve (water flow)" is activated by default (that means 24V),
if the input "Monitoring cooling water flow active" is set to "1".
As soon as the input is not set, then the output „ magnet valve (water flow)" will
be set to 0V.
5 seconds after the input "Monitoring cooling water flow active" is set to 1, the
monitoring of the input "Cooling water flow ok" begins:
If this input is set to 0 for 1 second, then the timer change in error state ("no
cooling water flow") and set the output "Magnet valve (water flow)" to 0V.
If the input "Cooling water flow ok" is set to 0 for ca. 1 second, then while welding
the schedule will be cancelled additional.
After reset of error the output "magnet valve (water flow)" will be switched on
again.

7.1.11 Supervision of minimum current

The time within which the current has to exceed a minimum threshold is
adjustable. If this threshold is not exceeded on average, the sequence is stopped
and an error message occurs.
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