Toshiba vlp technology P9 ASD Installation & Operation Manual page 186

F484
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
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
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 more information on this function.
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
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
Settings:
0 — Disabled
1 — Enabled
Direct Operation VLP Command Value via Communications
Program Virtual Linear Pump VLP Settings
During a properly configured VLP operation while operating in the Direct
mode and using communications for system control, this parameter establishes
the VLP 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.
178
for more information on this function.
Sealing Water.
Sealing Water.
Direct Access Number — F484
Parameter Type — Numerical
Factory Default — 10
Changeable During Run — Yes
Upper-
Minimum — 1
Maximum — 255
Units — Seconds
Direct Access Number — F485
Parameter Type — Selection List
Factory Default — Disabled
Changeable During Run — Yes
Direct Access Number — F486
Parameter Type — Numerical
Factory Default — 0.0
Changeable During Run — Yes
Minimum — 10
Maximum — 165
P9 ASD Installation and Operation Manual
F486