Data Flow Systems TCU800, Инструкция по установке и эксплуатации

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C h a p t e r 3
The TCU uses a numeric alternation scheme. With numeric alternation, the pump assigned as the new Lead pump is always
the next in the numeric order. For example, in a triplex lift station, if pump 2 (current Lead pump) and pump 3 (current
Lag pump) are running when the Lead Off level is reached, pump 3 would become the new Lead pump regardless of the
number of pumps running.
If the Jockey Pump or High Service Pump options are enabled, the remaining pumps will alternate per the selected scheme.
When the alternator is disabled, Pump 1 is used as the Lead pump, Pump 2 as the Lag pump, and Pump 3 as the Lag2 pump.
Use of Unused Pump Outputs
Unused pump outputs can be connected to any other type of control device. These devices can be turned on using the pump
override points. For example, in a duplex station (two pump operation), the third pump output could be connected to an
odor control injection.
Phase Monitor Options
In addition to the TCU’s internal phase monitor (see page 18), the TCU can use an external phase monitor or the internal
phase monitor can be bypassed.
External Phase Monitor
The TCU features an input at P2-4 that can accommodate the use of an external phase monitor where one is required. The
external phase monitor must provide a closed set of contacts that open during a phase fault. The voltage used to monitor
the set of contacts must be the same used to monitor the pump run statuses.
Phase Monitor Bypass
The TCU’s phase monitor can be bypassed if the internal phase monitor function is not required and there is no external
phase monitor. To bypass the TCU’s internal phase monitor, wire the phase monitor input (P2-4) in the ON state. The
voltage used to bias this point ON must be the same voltage used to monitor the pump run statuses.
Motor Run-Time Monitor
The TCU provides three digital monitor inputs for monitoring the status of the motors controlled by the TCU’s starter
relays:
• P2-1, MTR1_RUN
• P2-2, MTR2_RUN
• P2-3, MTR3_RUN
The Motor 1 Run input (MTR1_RUN) monitors the circuit controlled by the Motor 1 Starter output (MTR1_STR).
Correspondingly, MTR2_RUN monitors MTR2_STR, and MTR3_RUN monitors MTR3_STR.
Care should be taken to avoid cross-wiring the motor run inputs and starter outputs. For each pump controlled by the TCU,
the corresponding motor run input must be connected. After the TCU starts a pump, it checks the motor run input to verify
that the pump is running. If the signal is not present, it:
1. Shuts down the pump
2. Activates the pump’s motor-starter alarm