Endress+Hauser Liquisys M CPM223, Руководство по эксплуатации

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Operation Liquisys M CPM223/253
50 Hauser
5.4.6 Relay contact configuration
To use the RELAY function group you need a relay board which is not part of the basic version.
The following relay contacts can be selected and configured as desired (max. four contacts,
depending on options installed):
• Limit contactor for pH / redox: R2 (1)
• Limit contactor for temperature: R2 (2)
• PID controller: R2 (3)
• Timer for cleaning function: R2 (4)
• Chemoclean function: R2 (5)
• Neutralisation controller: R2 (6) (for Plus Package)
Limit contactor for pH / redox measured value and temperature
The transmitter has different ways of assigning a relay contact.
Switch-on and switch-off points and pick-up and drop-out delays can be assigned to the limit
contactor. In addition, you can configure an alarm threshold to output an error message and to start
a cleaning function in conjunction with this.
These functions can be used both for pH/redox measurement and for temperature measurement.
Please refer to Abb. 38 for a clear illustration of the relay contact states.
• When the measured values increase (maximum function), the relay contact is closed as of t
2
after
the switch-on point (t
1
) has been overshot and the pick-up delay has elapsed (t
2
- t
1
).
The alarm contact switches if the alarm threshold (t
3
) is reached and the alarm delay (t
4
- t
3
) has
also elapsed.
• When the measured values decrease, the alarm contact is reset when the alarm threshold (t
5
) is
undershot as is the relay contact (t
7
) after the drop-out delay (t
7
- t
6
).
• If the pick-up and drop-out delays are set to 0 s, the switch-on and switch-off points are also
switch points of the contacts.
Settings can also be made for a minimum function in the same way as for a maximum function.
C07-CxM2x3xx-05-06-00-xx-003.eps
Fig. 38: Illustration of the alarm and limit value functions
A
B Switch-on point > switch-off point: Max. function
Switch-on point < switch-off point: Min. function 1
2
3
4
5
6
7 Alarm threshold
Switch-on point
Switch-off point
Contact ON
Alarm ON
Alarm OFF
Contact OFF
t
1
t
1
t
2
t
2
t
3
t
3
t
4
t
4
t
5
t
5
t
6
t
6
t
7
t
7
t
t
B
1
2
3
3
2
1
4
5
6
7
4
5
6
7
A