Bell & Gossett S14334B Technologic 5500 Series Variable Primary Pump and Valve Controller - Manual (Page 8)

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1.7 Ground Connections
A grounding terminal is provided for a dedicated
ground wire connection. All provisions of the
National Electrical Code and local codes must be
followed.
1.8 Power Wiring
Power wire types and sizes must be selected based
upon conformance with the National Electrical Code
and all local codes and restrictions. In addition, only
copper (Cu) wire rated for 75°C (minimum) may be
used for the power connections. Refer to the input
current as listed on the nameplate on the enclosure
door when sizing wire.
1.9 Output/Motor Disconnect
It is necessary that any device that can disconnect
the motor from the output of the AFD be interlocked
to the emergency shutdown circuits of the AFD. This
will provide an orderly shutdown if the disconnecting
device is open circuited while the AFD is in operation.
Failure to provide this interlock may result in dam-
aged components due to improper installation.
1.10 Analog Signal Wiring
Shielded cable (#22 AWG, Belden type 8762, Alpha
#2411, or equal) should be installed for all D.C. con-
trol wiring. The shield must be terminated in the
Technologic Variable Primary Pump and Valve
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.
1.11 Field Connection Diagrams
Refer to the pump I.O.M. for specific details unique to
the pump.
Refer to the flow sensor/transmitter I.O.M. for specific
details unique to the flow sensor/transmitter.
The Wiring Diagram(s), Dimensional Drawings and
Field Connection Diagram should be reviewed prior
to unit installation and operation.
1.12 Sensor and Control Wiring
The following sections are based on the installation of
standard Technologic 5500 product. Because cus-
tomized software and hardware is available, the
installing contractor should base all wiring connec-
tions on the wiring diagrams that accompany each
controller. These sections are meant to complement,
not replace, those wiring diagrams.
1.12.1 DP Switches
Differential pressure switches sense the increase in
pressure between the pump suction and discharge
gauge taps. DP switches are used to determine
whether a pump is running. Each switch should be
wired from the normally closed contact.
1.12.2 AFDs
To monitor if an adjustable frequency drive is running,
it is necessary to wire from each AFD's normally
open "run" or "on" contact.
For the Technologic Variable Primary Pump and
Valve Controller to start and stop each AFD, it is nec-
essary to wire to the remote start terminals in each
AFD.
Additional wiring to each of the adjustable frequency
drives may be required with certain types of con-
troller programs. Refer to the wiring diagram for all
connection points.
With certain bypass and control methods, it is neces-
sary to disable an adjustable frequency drive from
running. This is accomplished by wiring from the
Technologic 5500 terminals to each AFD's interlock
terminals. Should this wiring be required, any
jumpers which may be found on the AFD's interlock
terminals should be removed.
1.12.3 Analog Inputs
The Technologic 5500 control family has the capa-
bility to accept many analog inputs. Typically, all
analog inputs must be 4-20mA and powered by the
24VDC power supply in the Technologic 5500. All
shields must be grounded, only in the Technologic
5500, to prevent ground loops and improper signals.
To monitor system zones, it is not necessary for all
analog inputs to be used. It is necessary, however,
that all zone transmitters be connected consecutively
starting with zone 1. Optional transmitters (i.e., other
than zones) may be supplied.
CAUTION: Metal filings can create electrical short
circuits. Do not drill, saw, file or perform any opera-
tion on the AFD conduit entry plate while attached to the
AFD.
FAILURE TO FOLLOW THESE INSTRUCTIONS
COULD RESULT IN PROPERTY DAMAGE AND/OR
MODERATE PERSONAL INJURY.
WARNING: Conduit grounds are not adequate. A
separate ground wire must be attached to the ground
lug provided in the enclosure to avoid potential safety haz-
ards.
FAILURE TO FOLLOW THESE INSTRUCTIONS
COULD RESULT IN SERIOUS PERSONAL INJURY,
DEATH, AND/OR PROPERTY DAMAGE.
WARNING: Prevent electrical shocks. Disconnect
the power supply before beginning installation. FAIL -
URE TO FOLLOW THESE INSTRUCTIONS COULD
RESULT IN SERIOUS PERSONAL INJURY, DEATH,
AND/OR PROPERTY DAMAGE.