Bell & Gossett S12596B Technologic 350 Pump Controller - Manual (Page 23)

23
APPENDIX F
POWER TRANSDUCER BOARD (PTB)
1.0
GENERAL DESCRIPTION
The PTB is a B&G proprietary board designed to mea-
sure total RMS load current and line voltage for either
single or 3 phase systems. This data is entered into a
microcontroller to calculate true power. True power,
amps, and volts are transmitted continuously to the
Tech 350 OIP microprocessor. These values are then
used for staging and/or display.
1.1 SAFETY
The PTB is an electronic board with high voltage. It
carries 3 phase voltage up to 600 volts. Do not touch
it. There are no manual adjustments on board. If it
should become defective, as described elsewhere in
this manual, replace it. Field repair is absolutely not
authorized under any circumstances.
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 com-
ponents 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.
DANGER: Troubleshooting live control panels ex-
poses personnel to hazardous voltages. Electrical
troubleshooting must only be done by a qualified electri-
cian.
Turn power off prior to opening control panel door.
Turn power offand confirm it is off with a voltmeter.
Lock out disconnect/s.
DO NOT:
– Touch PTB with power on.
– Move jumpers with power on.
– Wire with power on.
– Even think about modifications.
– Even think about repair.
Failure to follow these instructions could result in seri-
ous personal injury, death, and/or property damage.