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c) ALARM
The relays can be set for alarm mode conditions by selecting the option in SETUP – OUTPUT – RELAY – Relay *
mode. See the section below titled ALARM.
7.4 ALARM
There are six different alarms in the SETUP - OUTPUT - ALARM menu. Each alarm can be set to operate a relay, or
drive the current output, or both, or neither to the following states.
1. Current output - 3.6mA, 21mA, Hold as defined in “Alarm action” in the CURRENT OUTPUT menu.
2. Relay outputs – The relays energise in the alarm condition
The relays or current output must be set up for alarm or fault action for this function to operate. The effects of each
alarm action are shown in the list below :
1. Memory fault
2. PV out of limits
3. Current saturated
4. Temperature out of limits - this refers to the temperature within the control housing.
5. Digital input 1 active
7.5 DISPLAY
The display has 3 sections which can be programmed to display a selection of variables. Each section has a
parameter which is used to select the variable which is displayed. They are located in SET-OUTPUT-DISPLAY. The
required option is selected from the list as shown below.
Display option parameter number Description
D800 PV process value
D801 Sludge density
D805 % Current out
D806 Current output (mA)
D821 RL1 run time
D822 RL2 run time
D844 Control unit temperature
D850 Attenuation at 1 MHz
D851 Attenuation at 3.3 MHz
D860 Sensor frequency
P730 Date
P731 Time
Bargraph Please note that the bargraph only works on the
lower display and it shows % current output.
7.6 BACKLIGHT
■
11:59 0
00
0
12.35
←−−−−−−−−−
←−−−−−−−
←−−
UPPER DISPLAY
MIDDLE DISPLAY
LOWER DISPLAY