Bell & Gossett S12596B Technologic 350 Pump Controller - Manual (Page 20)

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6.16
INSTRUMENTS AND THEIR USE
With the diagnostics described herein extensive
instruments are not required. However, the instru-
ments used should be quality units to meet the fol-
lowing at a minimum.
Under no circumstances shall any instrument be used
to test any on board components. Especially risky is
an ohmmeter with battery voltage higher than TTL
logic or applied with incorrect polarity.
6.16.1 AC/DC Voltmeter –
- Input impedance shall not be less than 10
MEGOHM.
- Accuracy - AC ± 2% of F.S.
- DC ± 3% of F.S.
- Rated circuit to ground voltage = 1000V. Note
F.S. = Full Scale.
6.16.2 OHMMETER
- Accuracy ± 2_%
- Max open circuit voltage = _ volt
6.16.3 Millimeter
- Accuracy ± 2% of F.S.
6.16.4 Signal Generator (analyzer) - recommended
A. Beta calibrator Model 434 20mA signal analyzer.
B. Altec calibrator Model 334 4-20mA loop
analyzer.
Either instrument may be purchased from your Local
Process Control Distributor.
NOTE: If some other instrument is used it must float
above ground, preferably battery powered.
6.17
FIELD REPAIR
6.17.1 General – field repair, except replacing fuses, replac-
ing analog input resistors, and assuring connections,
such as ribbon cable, are correct and secure, is not
recommended.
6.17.2 EPROM Changing – normally EPROMs are not
changed in the field. In an emergency this is the proce-
dure to be performed when authorized by the factory.
A. Record all data from the OIP.
B. Turn off all power to the panel.
C. Ground your body. Touch earth ground to dis-
charge static electricity.
D. With one hand only gently pry EPROM (chip U1)
up from its socket alternating from each end in
small increments. Use a small screwdriver. Do not
place free hand on OIP components. Ground free
hand if possible.
E. Insert new EPROM with all pins in the socket and
the notch oriented as chip U2 notch (adjacent
chip).
F. If done carefully the EEPROM will not be corrupted.
G. Turn on power. Enter user menu per 5.1.3 and
check special data for the job at hand.
6.18
SERIAL NO. AND FIRMWARE VERSION NO.
6.18.1 Both of these numbers may be found as the 4th mes-
sage after booting. If the factory is called for informa-
tion or service on this unit the serial No. and firmware
version No. may be requested. They are important to
B&G in order to track the unit.
6.19 MAINTENANCE (PHYSICAL)
6.19.1 Electrical – no maintenance is required for the electri-
cal panel except to keep the boards free of dirt and
dust that might hold moisture. Cabinet door should be
kept closed, and the components kept dry.
WARNING: Electrical shock hazard. Multiple
power sources. The off position of the HAND-OFF-
AUTO switch does not disconnect all of the power
sources in the Technologic panel. All power sources must
be disconnected prior to entering the control panel.
Failure to follow these instructions could result in seri-
ous personal injury, death, and/or property damage.