KROHNE UFM 500 EN - Manual (Page 10)

10
2.3.2 Current output I
•
The current output I can be used passively or actively. If used passively it is galvanically insulated from all other
input and output circuits.
•
All functions and operating data can be set, see sect. 4 + 5.7 (not applicable to UFC 400 ... signal converter).
•
Factory-set data and functions are listed in the enclosed report on settings. This can also be used to record any changes
made to the operating parameters.
•
Maximum load at terminals I + , I, I
⊥
Maximum load in ohms
≤
680.
•
Time constant I, adjustable between 0.04 and 3600 seconds (fct. 3.3.6), refer to sect. 5.7.
•
Low flow cutoff SMU-I, can be set independently of SMU-F (frequency output). Cut-off “on” value between 1 and 19%
of Q
100%
(fct. 3.3.7 + 3.3.8), cut-off “off” value from 2 to 20% of Q
100%
(fct. 3.3.7 + 3.3.9), refer to sect. 5.10.
•
Connection diagrams, see below.
2.3.3 Frequency (pulse) output F
•
The pulse output is galvanically insulated from the current output if the current output is used passively.
Furthermore, the pulse output is galvanically insulated from all other circuits except for the status output with which it
shares a common (ground).
•
All functions and operating data can be set, see sect. 4 + 5.8 (not applicable to UFC 400... signal converter).
•
Factory-set data and functions are listed in the enclosed report on settings. This can also be used to record any changes
made to the operating parameters.
•
Active frequency output, for electro-mechanical totalizers EMC (terminals B1/B
⊥
) or for electronic totalizers EC
(terminals B1/B
⊥
), 10 to 3,600,000 pulses/hr (0.0028 to 1000 Hz), voltage between 19 to 32 V DC. Note that the total
current for the active frequency/pulse and status outputs together (drawn from I+) may not exceed 50 mA. (see
connection diagram 3 below).
•
Passive frequency output, open collector output for connection of active electronic counters EC or switchgear
(terminals B1/B
⊥
), input voltage
≤
32 V DC /
≤
24 V AC , load current max. 150 mA.
•
Time constant F, adjustable to 0.04 seconds or same as current output I (fct. 3.4.5)
•
Low-flow cutoff SMU-F, can be set independently of SMU-I (current output). Cut-off “on” value between 1 and 99% of
Q
100%
(fct. 3.4.6 + 3.4.7), cut-off “off” value from 2 to 20% of Q
100%
(fct. 3.4.6 + 3.4.8), refer to sect. 5.10.
•
Connection diagrams, see below.
•
The following table shows the possible pulse widths for F
≤
10 Hz:
F
100%
Pulse-width
F
100%
≤
10 Hz 30 or 50 ms
F
100%
≤
5 Hz 100 ms
F
100%
≤
2.5 Hz 200 ms
F
100%
≤
1.0 Hz 500 ms
If F
100%
> 10 Hz and
≤
1000 Hz, the pulse-width duty cycle is 50%.
2.3.4 Status output S
•
The status output is galvanically insulated from the current output if the status output is used passively. Furthermore
the status output is galvanically insulated from all other circuits except for the status output with which it shares a
common (ground).
•
All functions and operating data can be set, see sect. 5.9 (not applicable to UFC 400... signal converter).
•
Factory-set data and functions are listed in the enclosed report on settings. This can also be used to record any changes
made to the operating parameters.
•
Active status output, for electromechanical indicators or for electronic indicators, voltage between 19 to 32 V DC. Note
that the total current for the active frequency/pulse and status outputs together (drawn from I+) may not exceed 50 mA.
(see connection diagram 3 below).
•
Passive status output, open collector output for connection of electronic indicators, input voltage
≤
32 V DC /
≤
24 V AC ,
load current max. 150 mA.
•
Connection diagrams, see below.
2.3.5 Connection diagrams for outputs
B1 pulse output (P)
B2 status outputs (S)
Electrical connection in conformity with VDE 0100 “Regulations governing heavy current installations with mains
voltages up to 1000 V” or an equivalent national standard.