BUSCH VacTest, Инструкция по эксплуатации

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Communication | 6
Instruction Manual VACTEST DCC 400_EN_en 15 / 24
6.2.1 Setpoints
The gauge provides 2 independent, potential-free relay setpoints. These are available as
change-over switches at the connector according to the pin assignment described in
chapter
I/O and Communication Port Schematic [ ► 9] .
Relay R1, R2:
The relays can be independently configured for various switching modes. The Parameter
is used to query and set these switching modes.
Settings:
Settings Meaning
T[p
1
] F[p
2
] 2 pressure thresholds T[p
1
] (true) und F[p
2
] (false) are transmitted.
T[p
1
]<F[p
2
] Relay closes below p
1
and opens above p
2
T[p
1
]>F[p
2
] Relay opens below p
2
and closes above p
1
E Relay closes in case of a device error.
!E Relay opens in case of a device error.
U Relay closes in case of pressure under-range.
!U Relay opens in case of pressure under-range.
O Relay closes in case of pressure over-range.
!O Relay opens in case of pressure over-range.
C Relay closes when cathode is switched on.
!C Relay opens when cathode is switched on.
T0 Open relay by software command (off).
T1 Close relay by software command (on).
NOTICE
Setting T[p
1
] = F[p
2
] is forbidden!
Risk of damage to the relay!
• A gap between the thresholds being too small will result in flickering of the relay
6.2.2 Ionization Sensor
Cathode Control (CC):
It is possible to disable the ionization sensor by software command "Cathode Con-
trol" (CC) via RS485 interface:
Settings Meaning
0 disabled
►
ionization sensor remains switched off.
1 (Default) enabled
►
automatic ionization sensor control.
NOTE
Parameter "Cathode Control" is only temporarily saved in the gauge memory. After
mains supply is switched off or disconnected the parameter will be reset to "1" and the
ionization sensor enabled!
Cathode Control Mode (CM):
The cold cathode sensor can be switched on either manually or automatically.
The corresponding device parameter “Cathode Control Mode” (CM) can be set by soft-
ware command via RS485 interface: