ZENITH 140 INSTRUCTION MANUAL
104
P301 Switch Mode
When an external duty switch is used this can be connected via the digital
inputs and facilitate the selection of the duty device manually, thereby
overriding the duty programmed within the unit.
This parameter determines the type of switch in use.
A standard switch, e.g., rotary switch, can be used
with one switch position and a digital input
required for each pump.
To reduce the number of digital inputs used, for
manual duty selection, a binary switch can be
supplied. Max. No. of digital inputs required being
three.
P302 Override Delay
A digital input can be assigned to receive an input, which will override the
setpoints of the pumps and start or stop them, immediately after the expiry
of the Override Delay, dependent on the selected Digital Input Function
P373, 376, 379, 382, 385, 388, 391 = 3 (Override “ON”) or 4 (Override
“OFF”) and providing the level is above the Min. Override (P303), when
Override “ON” is selected.
Enter the required delay time in minutes.
P303 Min Override
Determines the minimum level required before an Override Delay (P302)
will be in effect when Digital Input Function P373, 376, 379, 382, 385, 388,
391 = 3 (Override “ON”).
Enter the required level in Measurement Units (P104).
P304 Input Delay
This parameter determines the delay applied, from the time a device (relay)
is called to “run” and when the status of the digital input is recognised as a
valid input. If the digital input is used to detect a “running” signal this
parameter should be set to reflect the time it takes from the device being
called to “run” to the input being in its operational status.
Enter the required time in seconds.
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