User Manual
E018-P
Page 28
FW_E018-P_M_v0301-01_EN
5.5.8
MENU 8: RELAY OUTPUTS
The “Pulse” menu configures the behavior of the digital output signals. As standard, four transistor
outputs are available (Type OT): D1, D2, D3 and D4. The output functionality can be configured for
each of these outputs.
Optionally, two relay outputs are available (Type OR): D5 and D6. The output functionality of these
outputs corresponds to the functionality of outputs D3 and D4 (respectively).
The following modes of operation are available for each output:
●
Off
: the output is switched off.
●
Lo-Lo
: the output shows the presence of a Lo-Lo flowrate alarm.
●
Lo
: the output shows the presence of a Lo flowrate alarm.
●
Hi
: the output shows the presence of a Hi flowrate alarm.
●
Hi-Hi
: the output shows the presence of a Hi-Hi flowrate alarm.
●
All
: the output shows the presence of any flowrate alarm.
●
Pulse
: a scaled pulse is sent on the output with width
8.5: RELAY OUTPUTS > WIDTH
each time the
accumulated total increases with amount
8.6: RELAY OUTPUTS > AMOUNT
.
●
Retransmit
: the unscaled incoming pulse from the flowmeter is retransmitted on the output.
The digital (transistor) outputs D1 and D2 have a maximum frequency of 500 Hz; digital outputs D3
and D4 have a maximum frequency of 4 Hz.
Make sure the output frequencies of the optional digital (relay) outputs D5 and D6 do not exceed
0.5 Hz, otherwise the relay lifetime and reliability will be reduced significantly.
8
RELAY OUTPUTS
8.1 RELAY 1
Selects the output functionality of digital output D1. The following functions
are available:
off, lo-lo, lo, hi, hi-hi, all, pulse, retransmit
The
Retransmit mode
is often used when sinus / non-square wave input
signals are present (for example, coil signals) that need to be transmitted as
robust square wave forms.
8.2 RELAY 2
Selects the output functionality of digital output D2. The following functions
are available:
off, lo-lo, lo, hi, hi-hi, all, pulse
8.3 RELAY 3
Selects the output functionality of digital outputs D3 and D5 (option). The
following functions are available:
off, lo-lo, lo, hi, hi-hi, all, pulse
8.4 RELAY 4
Selects the output functionality of digital outputs D4 and D6 (option). The
following functions are available:
off, lo-lo, lo, hi, hi-hi, all, pulse
8.5 WIDTH
When scaled pulse output is selected, the pulse width determines the time
that the output will be active, that is, the duration of the pulse. The pulse
width is set in milliseconds in the range 0.001 – 9.999 sec.
The value “zero” will disable the pulse output.
The scaled pulse signal always has a 50% duty cycle. This means the
minimum time between pulses is equal to the pulse width setting. If the
frequency goes out of range (for example when the flowrate increases), an
internal buffer stores the missed pulses. As soon as the flowrate slows
down, the buffer is emptied.
Pulses can be missed due to a buffer-overflow, therefore it is advisable to
program this setting within its range.
8.6 AMOUNT
One pulse is generated for every X-quantity measured. For example, if 100
pulses per gallon are required, enter 0.01 GAL.
0.01 GAL x 100 pulses = 1 gallon
After pressing PROG, the decimal point will start to flash. The decimal
position can then be changed by pressing the SELECT-key, then press the
CLEAR key to set the digits.