Bell & Gossett 70M Multiple Pump & Control Pressure Booster Systems - Manual (Page 28)

1.2 CURRENT SENSING
This is accomplished by inserting one common
power conductor through a linear output Hall effect
doughnut.
1.3 VOLTAGE SENSING
This is accomplished with a resistor network and a
potential transformer. Maximum voltage level is 600V
RMS.
1.4 CALIBRATION
Calibration is performed at the factory for all ranges
of current and voltage. This resides in the EEPROM
on board the PTB.
1.5 APPLICATION
The following is performed by the factory. However, if
a PTB is being replaced in the field the following must
be observed:
A. One common (to load) conductor must be run
through the doughnut.
NOTE: This conductor must not rest on the PTB
components except for the current transformer.
Arc the wire, in order to bias it away from the PTB,
before inserting it in the current transformer.
Secure in place with wire ties.
B. Insert this conductor into the hole on the flat side
of the doughnut with the load side of the conduc-
tor coming out of the opposite side of the hole.
C. 3 Phase – connect all 3 phases to terminals of J1
marked AØ, BØ, and CØ. Do not use com. AØ
must also be the same phase as that inserted into
the doughnut. Which is AØ, BØ or CØ is arbitrary
but must be established to follow these rules.
Single Phase – connect the “hot” line to AØ only
and neutral to com. Again AØ phase must be the
same phase as inserted into the doughnut.
D. Move voltage jumpers J3 and J6 to a voltage as
close to actual as possible. Jumpers on J3 and J6
must match each other.
E. Move jumper J2 to next highest amp terminal above
total motor load in amps. that may run at one time.
1.6 PHASE CONSIDERATIONS
The PTB will perform well with delta or wye systems,
grounded or ungrounded. However, on 3 phase
grounded systems do not ground the com. terminal
of J1.
1.7 MENU CONSIDERATIONS
A menu entry must be made as to whether this unit
will be used in a 3 phase or 1 phase system.
AUTHORIZED REPRESENTATIVE
Xylem Inc.
10661 Newkirk Street
Dallas, TX 75220
Phone: (469) 221-1200
Fax: (214) 357-5861
www.xyleminc.com/brands/bellgossett
Bell & Gossett is a trademark of Xylem Inc. or one of its subsidiaries.
© 2012 Xylem Inc. S12228B August 2012