SMC sierra monitor corporation Sentry Instruction Manual - Version 6
SERVICE
Page: 55
7. SERVICE
7.1 OVERVIEW
7.1.1 GENERAL
This section provides service information for Sentry
systems which have software version 6.0 and above The
section is intended for use by a qualified field technician.
Sierra Monitor sales and technical staff are available to
assist by telephone at (408) 262-6611, during normal west
coast working hours.
7.1.2 INSTALLATION INSPECTION
Prior to system start-up or trouble shooting the entire
system should be visually inspected. The following are
guidelines for that inspection:
7.1.2.1 CONTROLLER INSTALLATION
• Controller installed in conformance to
instruction manual recommendations.
• AC power is correctly grounded.
• Hot AC and relay connections have safety
covers installed.
• RS232C cable connection to printer correctly
seated and retaining screws tight.
7.1.2.2 CABLING INSTALLATION
• All splices are soldered or via terminal block.
• Cabling is away from sources of electrical noise
where possible.
• Terminals P, S, G (or 1,2,3) on channel
connector match terminals P, S, G on module.
Trace color codes to confirm correct wiring.
7.1.2.3 SENSOR MODULE INSTALLATION
• Module installation in conformance with
instruction manual recommendations.
• Modules accessible for calibration.
• Terminations to electronics card clean and
correct.
7.1.2.4 MOISTURE TRAPS AND RAINSHIELDS
• Conduit seals and drains installed to avoid
moisture build up in electronics enclosure.
Water accumulation in sensor module
enclosures is a major cause of damage and
system failures - take precautions to seal
electrical conduits and provide moisture traps
and drains to avoid water damage
• Rainshields installed where applicable.
7.1.2.5 STANDARD VOLTAGES
• AC Voltage on AC terminal on connector panel
of controller should be 120 VAC (or 220 VAC
option) +10%, -15%, 50-60 Hz.
• DC Voltage on DC terminal on connector panel
(if used) should be (12 VDC Nominal), 10 to 29
VDC.
• Channel Voltage (power to ground) should be
approximately 20 VDC on open channel and
approx. 18 VDC on used channel.
• Signal Oscillation on an “in use” channel (signal
to ground) can usually be read with a voltmeter
at approx. 0 - 6 VDC.
7.1.3 DATA COLLECTION
Sentry can provide a large amount of data which will be
helpful during problem solving. If the system has a
printer use the TIME KEY to select HISTORY REPORT and
press ENTER. When the report is complete SYSTEM
REPORT will display on the controller, press ENTER to
print. Diagnostic reporting capability is discussed in
Section 7.3.5.
If a printer is not in use, key information can be read and
manually recorded by selection of the HISTORY (TIME
KEY), CHECK MODULE and CHECK SYSTEM (MODE KEY)
menu choices
7.1.4 INSPECTION AND TROUBLESHOOTING GUIDE
The inspection and troubleshooting guide can be used to
step through the system start-up and to determine the
corrective action if a fault occurs.
Instructions:
1. Take the action described in the "Operator
Action" column.
2. If the “CORRECT” result occurs, proceed to the
next Operator Action.
3. If the “Incorrect” result occurs find the probable
cause and corrective action in the “Reason/
Correction” column.