Micromod Micro-DCI: 53MC5000 Multi-Loop Process Controller Instruction Manual - Manual (Page 310)

18.0 MAINTENANCE AND PARTS LIST
✶ ✶ RETAIN THE INSTRUMENT CALIBRATION SHEET ✶ ✶
The factory set calibration constants for the analog inputs and analog outputs
are recorded on the instrument calibration sheet. This sheet should be
retained in the event one or more of the constants is inadvertently changed to
the wrong value and field recalibration is necessitated.
18.1 SERVICE APPROACH
This instrument is a microprocessor based device; the data manipulation and sequencing operations
are software controlled. Adjustment, diagnostic testing, and preventive maintenance of the hardware
are not required.
Generally, when a process malfunction occurs, it usually manifests itself as an instrument problem
even though it might be a defective process variable monitoring device, remote transmitter, or the
connecting wires. These associated remote devices and the connecting wires should be checked
first to ensure the problem is isolated to the instrument.
If it is determined the instrument is malfunctioning, attempting fault finding analysis beyond the board
level to the integrated circuits (ICs) of the main printed circuit board (PCB) is not recommended, as
it requires familiarity with CMOS technology, microprocessor functionality, and the proper test
equipment.
Also, ICs are static sensitive and can be damaged if not properly
handled.
18.2 PARTS REPLACEMENT
The parts replacement procedures are provided in Table 18-1. When replacing parts, reference
Figure 18-1. Parts for specialized options, e.g., HART interface, are described in the documentation
provided with the controller if that option is installed. Section 1.5, Related Documentation lists all
controller related book numbers and titles as of the release date for this book.
WARNING
ALWAYS REMOVE POWER BEFORE ATTEMPTING TO INSTALL,
DISASSEMBLE, OR SERVICE THE CONTROLLER. FAILURE TO REMOVE
POWER MAY RESULT IN SERIOUS PERSONAL INJURY AND/OR EQUIPMENT
DAMAGE.
ELECTROSTATIC DISCHARGE
USE A GROUNDED WRIST STRAP TO PREVENT DAMAGE TO IC DEVICES
WHEN HANDLING MODULES.
Section 18. Maintenance and Parts List
18-1