174 P9 ASD Installation and Operation Manual
Low Suction Pressure Delay Timer
Virtual Linear Pump Low Suction Pressure Delay Timer
This parameter has three functions.
1. It is used to set the time that the ASD will be allowed to run at the Upper-
Limit Frequency continuously before the system is turned off.
This condition is used as an indication of loss of feed water or a closed
output valve. See
F483 for additional information on this function.
2. It is used to set the time that a Low Suction/No Flow condition is allowed
to continue before a shut down.
3. It is used to set the time that must lapse before a system restart is attempted
after a system shut down due to a Low Suction/No Flow condition. See
F450 for additional information on this function.
Direct Access Number — F484
Parameter Type — Numerical
Factory Default — 10
Changeable During Run — Yes
Minimum — 1
Maximum — 255
Units — Seconds
Sealing Water/Vacuum Prime Enable
Virtual Linear Pump Sealing Water/Vacuum Prime Enable
This parameter Enables/Disables seal water detection.
On larger or older pumps, external sealing water is required at start up. Until
adequately supplied with sealing water, the ASD will not start.
An external sealing water pump is required to supply sealing water and is
enabled via an ASD output contactor set to
Sealing Water.
Normal ASD operations are allowed once an adequate water supply is detected
at the seal, as detected by a pump-mounted reed switch that is connected to a
discrete input terminal of the ASD.
Set the discrete input terminal to Sealing Water.
Settings:
0 — Disabled
1 — Enabled
Direct Access Number — F485
Parameter Type — Selection List
Factory Default — Disabled
Changeable During Run — Yes
Direct Operation (Virtual Linear Pump) Command Value via
Communications
Program Virtual Linear Pump Virtual Linear Pump Settings
During a properly configured Virtual Linear Pump operation while operating
in the Direct mode and using communications for system control, this
parameter establishes the Virtual Linear Pump level.
This parameter setting is effective ONLY while operating in the Direct mode
and while receiving a command via communications. The end value of this
parameter setting appears in the Frequency Command screen as shown below.
Direct Access Number — F486
Parameter Type — Numerical
Factory Default — 0.0
Changeable During Run — Yes
Minimum — 10
Maximum — 165
F484 F486
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