Endress+Hauser Silometer FMC 672 Z, Инструкция по установке и эксплуатации

Страница: 39 / 64

7.1 Control parameters
Relay assignment For the Silometer FMC 672 Z/677 Z transmitters, the matrix fields V1H4 and V5H4 assign
the relays to the analogue outputs 1 or 2 as required.
Step Matrix Entry Significance
1 V1H4 e.g. 2 Relay 1 is assigned to analogue output 2
2 - »E« Register entry
Note!
•
Normally analogue output 2 follows the display at V4H0. It is possible, however, to
assign output 2 to channel 1 by entering 1 at V8H2 - see Chapter 6. In this case the
output follows V0H0.
Switch point The switch point is set in the units used for calibration or linearization at V1H0 for relay 1
and V5H0 for relay 2.
Step Matrix Entry Significance
1 V1H0 e.g. 200 Level or volume at which relay 1 triggers
2 - »E« Register entry
Fail-safe mode This function determines whether the relay is to act as a minimum or maximum limit
switch, entries are made as V1H1 for relay 1 and V5H1 for relay 2:
•
0 = minimum fail-safe: the relay de-energises if the level or volume
drops below the value entered at V1H0/V5H0
•
1 = maximum fail-safe: the relay de-energises if the level or volume
rises above the value entered at V1H0/V5H0
Step Matrix Entry Significance
1 V1H1 e.g. 0 Relay 1 de-energises when level drops below switch point
2 - »E« Register entry
Minimum fail-safe mode, setting 0 Maximum fail-safe mode, setting 1
Level Relay status LED Level Relay status LED
Drops below
switch point De-energised Green off
Red on Rises above
switch point De-energised Green off
Red on
Rises above
hysteresis Energised Green on
Red off Drops below
hysteresis Energised Green on
Red off
Table 7.2:
Truth table for minimum and
maximum fail-safe mode
z18 d20 z20
z22 d24 z24
z18 d20 z20
z22 d24 z24
z18 d20 z20
z22 d24 z24
z18 d20 z20
z22 d24 z24
Silometer FMC 672 Z/677 Z Chapter 7: Limit Switches
37