Emerson Process Management MSL600 manual Display parameters HMI, Relay On and Off Points

	Installation, Operation & Maintenance Manual
MSL600	IP262/Z0, Rev. AB
	February 2012

7.6.2Relay On and Off Points

Relay On Point for RL1 (P411) and RL2 (P421)

This is the sludge blanket level at which the Set Point mode relay turns on i.e. between 0.000 and 7.000m (0.00 to 23.00 ft). See also section 7.6.1.3 for related information.

Relay OFF Point for RL1 (P412) and RL2 (P422)

This is the sludge blanket level at which the Set Point mode relay turns off i.e. between 0.000 and 7.000m (0.00 to 23.00 ft). See also section 7.6.1.3 for related information.

7.6.3Relay overrides (Min ON, Max ON, and Min OFF)

Relay minimum on time (Min ON) for RL1 (P413) and RL2 (P423)

This is the minimum time for which the relay will remain on in non-alarm or fault modes. This takes priority over the maximum on time. It is important to note that this function only operates when the minimum off time is set to a non-zero value. This parameter can be set between 00:00 and 99.59 in mm:ss.

Relay maximum on time Max ON for RL1 (P414) and RL2 (P424)

This is the maximum time for which the relay will remain on in non-alarm or fault modes. It is important to note that this function only operates when the minimum off time is set to a non-zero value. This parameter can be set between 00:00 and 99.59 in mm:ss.

Relay minimum off time Min OFF for RL1 (P415) and RL2 (P425)

Once the relay has turned off this is the minimum time before the relay will turn on again. If both minimum and maximum on times are set to zero (default) then they are not used. This parameter can be set between 00:00 and 99.59 in mm:ss.

7.7 Display parameters (HMI)

7.7.1 HMI upper, middle, and lower display options

The top right hand section of the main display, the HMI, can be adjusted to suit your requirements. The HMI display is split into three regions:

1.	Display Upper - P570	(Default – Time)
2.	Display Middle - P571	(Default – Sludge level)
3.	Display Lower - P572	(default – Date)

What is displayed in these sections is selected from a list as follows:

•Time

•Rad msg count

•None

•Sludge Level

•Range

•% mA Output

•mA Output

•RL1 run-time

•RL2 run-time

•Clean run-time

•Internal Temp

•Xducer Temp

•Noise level

•% Free Lg Mem

•Description

•Tag

•Date

Note: The current output and relays are always controlled by sludge level regardless of display selection.

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