Analogue Outputs; Isolation Contactor Control; Weld Circuit Degradation - Bosch Rexroth PSI 6 C 775 Serie Typspezifische Anleitung

R911172797 | PSI 6xCx.775
Discrete output A_18 =" DIO OUT 2 –
Water Saver Reset"
Analog output X2.1 und X2.2 =
„Analog Pressure Output"
Discrete Input E_01 = "Weld Contactor
Not Closed" – Normally Closed Aux
Discrete Output A_01 = "Close Weld
Equal Serial input 2.10 Timer DIO Out 2.
7.1.5

Analogue outputs

This Output is activated during the Weld Schedule to a programmable analog
value for control of a proportional valve.
7.1.6

Isolation Contactor Control

This input will monitor the operation of the weld contactor. An auxiliary contact on
the weld contactor will be connected to this input. The input will be "off" (0V)
Contact when the weld contactor is closed, "on" when the weld contactor is open.
The input will be checked during internal 250 millisecond delay (Contactor Close
Time). If the input is not off at the end of the delay a Fault is created "Weld
Contactor 1 did not close"
The input will be checked after opening the Weld Contactor. If the input is not
"on" in 250 milliseconds, a fault will occur and the error message "Weld Contactor
1 Did Not Open" will be displayed.
The Weld Contactor Output will be set with the receipt of a Binary Pilot. An
Contactor" internal delay of 250 milliseconds (Contactor Close Time) will start. Output Close
Weld Contactor will be turned off by an E-Stop or by a Timeout.
A Timeout is defined as a period of time with no receipt of a "Start" signal. The
timeout is programmable from 1 – 10 seconds.
Contactor Close Time is an internal 250 millisecond delay. It is started by the
receipt of a Binary Pilot Serial Input 1.14 – 2.05. The delay prevents the start of
pre-squeeze. The delay will continue until Discrete Input E_01 is off (0v) or until
the end of the time.
7.1.7

Weld Circuit Degradation

If the functionality „Weld Circuit Degradation" is enabled, the controller cross-
checks at the end of each weld schedule the weld current-to-phase angle ratio to
a programmable reference value.
If the actual value out of a programmable tolerance, the controller generates a
warning message.
To have this functionality running reliably, even at a nominal value change, e.g.
readjustment, the actual current value will be projected to a max value of 100% of
the power based on the actual phase angle for a start, and then compared with
the reference value of a 100% power.
Due to an influence of the fluctuations in mains voltage on this value also, the
tolerance band needs to be bigger than the system immanent fluctuations in
mains voltage.
This function can be switched on or off for each electrode (gun).
Details to Weld circuit degredation (WCD) function refer to Tab. 1: Required and
supplymentary documentation Rexroth PSx 6xxx Technology and timer functions.
Bosch Rexroth AG 73/78
Features