Bell & Gossett 10 001 265R5 TechnoForce Pump Controller - Manual (Page 14)

TECHNOFORCE Installation, Operation, and Maintenance 8
3.4.4 Analog signals
Shielded cable (#22 AWG, Belden type 8762, Alpha #2411, or equal) should be installed for all D.C. control
wiring. The shield must be terminated in the Controller panel. Do not connect the shield at the other end of the
cable! Insulate the shield so that no electrical connection is made at the other end of the cable. A twisted pair of
#22 AWG conductors (Belden 8442, or equal) can be used in place of shielded cable. The cable length must be
limited to 5,000 feet for #22 AWG wire.
3.4.5 Field connection diagrams
Refer to the pump Installation, Operation, and Maintenance Manual for specific details unique to the pump.
Refer to the flow sensor/transmitter Installation, Operation, and Maintenance manual for specific details unique to the
flow sensor/transmitter.
Job specific wiring and dimensional drawings and typical field connection diagram should be reviewed prior to unit
installation and operation.
3.5 Glossary of terms
VFD Variable Frequency drive; converts a constant power input into a variable power output for the motor;
a device for controlling motor speed.
Alternation Process of determining which pump will serve as lead pump and which pump will serve as lag pump.
Destage To turn off a lag pump.
EOC End of curve; point at which a pump is staged or destaged.
Lag pump Standby pump which activates only when lead pump alone cannot efficiently provide sufficient
pressure or flow rate.
Lead pump Duty pump which runs continuously until a standby pump is required.
LED Light emitting diode, located on OIP and controller.
OIP Operator Interface Panel.
PID Proportional Integral Derivative; 3 variables required for error control.
PV (Process Signal generated by a sensor which is set up to control the system.
Variable)
Proof timer
Minimum time period before controller acknowledges an input; time period for which a signal must
be stable before it is accepted by the controller as a sustained and valid signal.
RTC Real time clock.
Stage To start a lag pump.
SP Set point.
HD Hard Deck.
Product Description