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Two types of
fault inputs may be monitored.
1) Dry
contact closures where polarity may
be set via dip switch setting.
a.
Set S5-1 to “Off” for
normally open fault input.
(Closure=fault)
b.
Set S5-1 to “On” for normally
closed fault inputs. (Open =fault)
2)
Supply current being provided
by the controller.
Separate Fault
type enables:
a.
Set S5-2 to “On” to enable
dry contact fault inputs.
b.
Set S5-2 to “Off” to disable
dry contact fault inputs.
c.
Set S5-3 to “On” to enable
current monitoring faults
d.
Set S5-3 to “Off” to disable
current monitoring faults
Dry Contact
Fault Inputs:
These fault
inputs are fed into the controller
through the rear chassis D-Sub type
(Soc) connector J3. Two pins are
allocated for each amplifier.
FIG. 3
These fault
inputs may be configured via a dip
switch setting for either a
“normally open” or “normally closed”
fault input.
Dip switch 5 is
used for this selection.
Dip switch 5 is
a 3 position dip switch.
Set S5-1 to
“On” for normally closed fault
input. (Open=fault)
Set S5-1 to
“Off” for normally open fault
inputs. (Closure =fault)
Set S5-2 to
“On” in order to monitor the contact
fault inputs.
Set S5-2 to
“Off” in order to ignore the contact
fault inputs.
Normally
open fault defined:
A normally open
fault input is defined by this
document as a fault input that is
“normally open” in a no fault
condition. When the “normally open”
fault input closes, a fault is
declared. A closure causes a fault.
Normally
closed fault defined:
A normally
closed fault input is defined by
this document as a fault input that
is “normally closed” in a no fault
condition. When the “normally
closed” fault input opens, a fault
is declared. These two fault pins
being open (no contact with each
other) constitutes a fault
condition.
Current
Monitoring Faults:
Setting Up
Current Monitoring:
When the
amplifier is ON, it should be
drawing current from a supply inside
the controller. This current is
monitored in such a way, that should
it deviate from a specified window,
a fault is declared.
Set Dip switch
5-3 to “ON”. (Factory set to “On”)
This will
instruct the DNL-5 to monitor the
currents being drawn from the
amplifiers. This monitoring will
affect automatic function.
When an
amplifier operates outside its
window for more than a few seconds,
a fault is declared. This fault
will show up on the front panel by
the associated fault led turning
from green to a flashing red.
In order to set
up an amplifier, a minimal amount of
adjustments must be made. These
adjustments allow the DLN-5 to be
used with just about any amplifier.
The adjustments are necessary
because different amplifiers draw a
different amount of current.
For amplifiers
that draw >325mA (More than 0.325
Amps), Go to Section 1.2. (In
Manual) (no need to move any
jumpers if your amplifiers draw less
than 325 mA. @ 24V.)
Section 1.1
(See fig. 2)
All that really
needs to be done is, with an
amplifier ON and drawing current,
set it’s associated “V Adj”
potentiometer to 2.5V. This is done
using potentiometers R3, R11, and
R19, for amplifiers A,B,C
respectively. This voltage may be
monitored on test points TP1,TP3,TP5
for amplifiers A,B,C respectively.
Setting
Amplifier A:
With a volt
meter set up between TP1 (SET 2.5V)
and GND (REF pin), measure the
voltage being displayed with
amplifier A drawing current. Rotate
potentiometer R3 so that the volt
meter reads about 2.5V.
Setting
Amplifier B:
With a volt
meter set up between TP3 (SET 2.5V)
and GND (REF pin), measure the
voltage being displayed with
amplifier B drawing current. Rotate
potentiometer R11 so that the volt
meter reads about 2.5V.
Setting
Amplifier C:
With a volt
meter set up between TP5 (SET 2.5V)
and GND (REF pin), measure the
voltage being displayed with
amplifier C drawing current. Rotate
potentiometer R19 so that the volt
meter reads about 2.5V.
With an
amplifier drawing current, and its V
ADJ voltage set at 2.5V, the front
panel led should be green.
Setting the
DELTA voltage:
(IMPORTANT:
Please note there should not be any
need to adjust the potentiometer R25
(DELTA V).
What is “DELTA
V”?
The value of
“DELTA V” is what sets up the window
around the 2.5V. This value set up
by potentiometer R25 may be measured
at TP7. Typically, the value of
this “DELT V” is around 0.5V. It is
set at the factory at 0.6. The
window may be expanded or contracted
if desired.
A current
monitored fault is declared when the
current being monitored falls
outside the “window”. The “window”
is between 2.5V - DELTA V and 2.5V +
DELTA V.
Please Note
that the amplifier currents are
available on the computer port, but
these measurements mustn’t be used
for any fine measurement purposes.
The A/D converter used on the DNL-5
is an 8-bit device. That means that
each bit is worth 20 mV. There is a
1:1 relationship between current and
voltage with this application, so
each bit is worth 20 mA of current.
Therefore, the measurements
available on the computer interface
port are to be viewed as somewhat
coarse numbers only.
Fault
operation:
When an
amplifier is in a no fault
condition, its associated led should
be green on the front panel and the
relay indicator on the remote STD
port should be open.
In the event of
a fault, the fault led will go red,
and begin to flash on and off. The
audible alarm on the front panel
will sound on and off (if the
audible enable switch is placed to
“ON”). The relay fault indicator on
the remote STD port will become a
steady closure.
Pushing the
“RESET” button on the front panel
will extinguish the audible alarm,
and cause the fault led to go steady
state. The fault light will always
track the true status of the fault.
A blinking green led may signify
that a fault had occurred, but then
went away.
The response
time to a closure type fault is
immediate. (keep in mind the time
needed to switch a wave guide
switch.)
The response
time to a current fault is a few
seconds. This allows any minor
variations that may occur in the
amplifier current draw to take place
without causing an
alarm. |
