ITT PumpSmart PS220, Руководство по конфигурации и эксплуатации

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PS220 Configuration & Operation Guide
PS220 154
Functions &
Features
Minimum Flow Bypass Recirculation
The PS220’s Flow Bypass Recirculation function will allow for a triggered event that can be used to control the opening
and closing of a minimum flow bypass valve that may be required in a pumping system. An available Relay Out can be
used with this function to send the signals to external devices when required to operate.
This functionality uses the Minimum Flow value sensed from either SmartFlow or from an external flow meter.
The Table below lists the parameters that are used in this configuration.
Parameter
Name
Setting
Notes
75.15 Flow Bypass Source
Off( Default)
Flow Actual
Smartflow
Process TX2
Defines the flow signal for
the Bypass function
75.17
Flow Bypass on Flow
Value
0 (Default)
(0-100000)
The set flowrate value used
to trigger the function to
operate.
Units are as selected with
the flow signal
75.18 Flow Bypass Off Ratio
2.1 (Default)
(0-5)
Defined as a percentage
of the “Bypass On flow
value” when to close.
75.19 On Delay
1 Default
(0-1800 Seconds)
Time for the logic to turn on
the relay
75.20 Off Delay
1 Default
(0-1800 Seconds)
Time for the logic to turn off
the relay
75.21 Relay Start Delay
15 (Default)
(0-200 Seconds)
Time for the Logic to
activate the “Flow Bypass
Open” Warning Message
to Open the Bypass and to
energize the selected
relay. The relay will turn
and off based on the time
settings of 75.19 and 75.20
Notes
1. A warning Message will Flash “Bypass Valve Open” when the relay energizes and continue to flash until it closes.
2. The Value of 75.17 “Flow Bypass On, Flow Value” can be a different value than what is already defined in Parameter
79.09 for MIN FLOW. 75.17 will be internally corrected proportionally to the change in speed with the Pump Affinity Laws
(Q1/Q2 = N1/N2 where Q = Flow and N = Speed).
This function can be configured with the PS220 Configuration wizards.
To access the Flow Bypass Recirculation Wizard from the Home View, follow the path: Menu>PS220 Configura-
tion>PUMP & VFD PROTECTION >Condition Monitoring>Next>Next>
1. Configure the use of the function by choosing, yes
2. Select the FLOW BYPASS SOURCE:
3. Define the FLOW BYPASS ON Flow rate:
Remember this can be a different value than what is already defined in Parameter 79.09 for MIN FLOW
4. Set the FLOW BYPASS OFF RATIO
5. Set the ON DELAY: Defines the time duration for the Flow Bypass to activate the relay after the minimum flow value has
been reached after the duration of FLOW RELAY START DELAY expires.
6, Set the OFF DELAY: Defines the time duration for the Flow Bypass to deactivate the relay after the product of FLOW
BYPASS ON x FLOW BYPASS OFF
RATIO is reached.
5. Set the FLOW RELAY START DELAY: