Flow Indicator Totaliser 1006H
REF NO: m16Aom101
Issue No: 03
User Manual
6
2. SAFETY AND WARNING PRECAUTIONS
2.1 Safety Precautions
o
Before installation or beginning of any troubleshooting procedures power to all
equipments must be switched off and isolated. Units suspected of being faulty must be
disconnected and removed first and brought to a properly equipped workshop for testing
and repair. Component replacement and interval adjustments must be done by a Masibus
authorized or trained person only.
2.2 Warning Precautions
o
It is recommended that power of these units to be protected by fuses, circuit breakers or
external over current rated at the minimum value possible.
o
All wiring must confirm to appropriate standards of good practice and local codes and
regulations. Wiring must be suitable for voltage, current, and temperature rating of the
system.
o
Unused control terminals should not be used as jumper points as they may be internally
connected, causing damage to the unit.
o
Verify the ratings of the output devices and the inputs are as specified.
o
Provide Power from a single-phase instrument power supply. If there is a lot of noise in
the power line, insert an insulating transformer into the primary side of the line and use a
line filter on the secondary side. As counter measures against noise, do not place the
primary and secondary power cables close to each other.
Note:
o
Information in this manual is subject to change without prior notice or permission
due to continuous improvement.
CAUTION:
High voltage transients may occur when switching inductive loads such as some
contactors or solenoid valves. Through the internal contacts, these transients
may introduce disturbances which could affect the performance of the instrument.
For this type of load it is highly recommended that a “snubber” is connected
across the normally open contact of the relay switching though load. The snubber
recommended consists of a series connected resistor/capacitor (typically
15nF/100 Ohms
). A snubber will also prolong the life of the relay contacts. A
snubber should also be connected across the output of a trip output to prevent
false triggering under line transient conditions.
