Idiomas disponibles
Idiomas disponibles
RS Stock No.
Type
629-465
Single Level
629-471
Dual Level
629-487
Single Level
629-493
Dual Level
Trip Amplifiers are supplied with relays that operate in a specified
manner with regard to the analogue input signal. The terminology used,
such as HIGH or LOW TRIP and FAIL-SAFE or NON-FAIL SAFE
OPERATION, refers to the set-up for the relays.
HIGH and LOW TRIP refer to the section of the analogue input signal
which represents the alarm condition. HIGH TRIP means that the alarm
condition is above the setpoint and LOW TRIP means that the alarm
condition is below the setpoint.
FAIL-SAFE OPERATION means that the relays are normally energised
and will de-energise in the alarm condition, i.e. the relays FAIL to the
alarm condition in the event of a power failure.
NON-FAIL SAFE OPERATION means that the relays are normally de-
energised and will energise in the alarm condition.
In all cases the state of the relays is indicated by the RED/GREEN LED
which is visable through the front of the instrument.
RED= Alarm Condition and GREEN=Normal or Safe condition.
The instruments are factory set to:
for:
1.Single Level Trip Amplifiers - High Non-Fail Safe
2.Dual Level Trip Amplifiers - High (and) Low Fail-Safe
These trip settings can be readily changed by the removal and re-
insertion of the jumper links on a series of jumper pads located on one
of the printed circuit boards (PCB's) within the instrument.
The instrument comprises two separate PCB's joined together by a
flexible connector strip.
In order to remove the PCB's from the outer case first remove the front
panel by inserting a screwdriver under the top or bottom edge and lever
out. The terminal block retaining lugs are released by gently easing the
sides of the outer casing away from these blocks. They can then be
individualy pulled forward, permittingthe two attached PCB's to be slid
out of the case together.
Care should be taken when removing the PCB's from the outer casing.
Both PCB's must be removed at the same time.and handled so that the
connector strip is not subjected to the full weight of either PCB.
PLEASE ENSURE THAT THE POWER SUPPLY IS SWITCHED OFF
PRIOR TO EXTRACTING THE PCB's.
Diagrams overleaf show the location of the jumper pads and the
orientation of the links in order to achieve the required relay action.
Calibration
Each instrument is supplied factory calibrated and no further
adjustment should be necessary. If it does become necessary to trim
the calibration then please carry out the following procedure:
First you will need to remove the instrument from its casing as detailed
above.
Input
Power Supply
4 to 20mA
115/230Vac ±15%
4 to 20mA
115/230Vac ±15%
0 to 10V
115/230Vac ±15%
0 to 10V
115/230ac ±15%
1. Apply the correct power supply, 115 volt 50/60 Hz across terminals
13 and 14, or, 230 Volt 50/60 Hz across terminals 12 and 14.
2. Rotate the set-point potentiometers RV1 (DIN120 only) and RV2 to
0% (fully anti-clockwise)
3. Inject a 0% signal
4. Rotate RV4 (the Zero potentiometer) to the point where the trip
LEDs LE1 and LE2 (DIN120 only) just change colour.
5. Rotate the set-point potentiometers RV1 (DIN 120 only) and RV2 to
100% (fully clockwise)
6. Set the input to 100% of span
7. Rotate RV3 (the Span Potentiometer) to the point where the trip
LEDs LE1 and LE2 (DIN120 only) just change colour
8. Repeat operations 1 to 7 until both points are as close as possible
9. Set the input to 50% of span
10. Check that LE1 changes colour when RV2 is at the 50% point
11. Check that LE2 (DIN120 only) changes colour when RV1 is at the
50% point
Having reset the potentiometers, we recommend that the pots are
sealed using a suitable sealant.
Finally replace the instrument in its casing and re-insert the fascia
window.
RS Components shall not be liable for any liability or loss of any nature (howsoever
caused and whether or not due to RS Components' negligence) which may result
from the use of any information provided in RS technical literature.
V9222
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