The Green Indicator LEDs, the Replaceable Fuse F12,
and the Resettable Fuses F1 through F11:
1) The Electro-Sentry 1 has two
Green indicator LEDs
for the on-board power circuits.
The
Green indicator LED D34
is for the digital power
circuit.
The
Green indicator LED D28
is for the analog power
circuit.
If one or both of the Green
LEDs D34 and D28 are
‘OFF’, then perform the following troubleshooting
steps:
a)
Is the SW1 Vac Selection Switch set FIRMLY
to the proper 115Vac or 230Vac position (and
NOT inadvertently sitting part-way between the
selections)?
b)
Is there proper Vac power applied to the ES1 unit at
terminal block TB29?
c)
Is the main
replaceable Fuse F12
still GOOD?
Note: F12 is a replaceable fuse (it is not the
resettable type).
d)
If one or both of the Green LEDs D34 and D28 are
still ‘OFF’ after successfully performing the first
three steps, then the Electro-Sentry 1’s main power
circuitry has been damaged.
2) The Electro-Sentry 1 uses on-board
resettable fuses
in the
output circuits of the digital power supply (
Fuse F11
), and
the analog power supply (
Fuse F10
).
If a higher than normal current occurs in the ES1’s
digital circuit section, then Fuse F11 heats-up and
effectively removes the +24Vout_D voltage and the
Green indicator LED D32
turns ‘OFF’.
If a higher than normal current occurs in the ES1’s
analog circuit section, then Fuse F10 heats-up and
effectively removes the +24Vout_A voltage and the
Green indicator LED D30
turns ‘OFF’.
If either the Green LEDs D32 or D30 are ‘OFF’, then
perform the following troubleshooting steps:
a)
First, verify that the Green LEDs D34 and D28 are
both ‘ON’. If not, then see section (1) above.
b)
Next, remove the Vac power from the ES1 unit for
about 2 minutes (to allow Fuse F11, or Fuse F10, to
cool-down).
c)
Then, re-apply the Vac power to the ES1 unit.
d)
If the
Green LED D32
or
D30
is still ‘OFF’, then
the on-board digital power supply or the analog
power supply (whatever the case may be), has been
damaged.
3) The Electro-Sentry 1 uses on-board
resettable fuses
in the
power supply paths going to the 4-20 mA Temperature/
Contact Closure sensors, the 4-20 mA Analog Speed
encoder, and the Frequency Pulse Train Speed encoder.
For the Temperature or Contact Closure sensors the
Free Catalog and Application Assistance
1.800.328.6170
Website: www.electro-sensors.com
990-005500 Revision D
15
resettable fuses are in series with pins #1 of TB1 thru TB14.
There is one on-board
resettable fuse
for each pair of Inputs,
as follows:
Input Fuse
Input Terminal
Blocks
Analog Input
Pairs
F1
TB1 & TB2
#1 & #2
F2
TB3 & TB4
#3 & #4
F3
TB5 & TB6
#5 & #6
F4
TB7 & TB8
#7 & #8
F5
TB9 & TB10
#9 & #10
F6
TB11 & TB12
#11 & #12
F7
TB13 & TB14
#13 & #14
(Unused)
For the 4-20 mA Analog Speed encoder the
resettable fuse
is in series with pins #1 of TB15 and TB16, as follows:
Input Fuse
Input Terminal
Blocks
Analog Input
Pairs
F8
TB15 & TB16
#15 & #16
(#15 is unused)
For the Frequency Pulse Train Speed encoder the
resettable
Fuse F9
is in series with pin #1 of TB30.
If a higher than normal current occurs in any of the
Temperature or Contact Closure sensors, the Analog Speed
encoder, or the Frequency Pulse Train Speed encoder, then
the corresponding resettable fuse heats-up and effectively
removes the +24 Vdc output power from the sensor’s TBx
terminal block pin #1. If it appears any one of these sensors
have no +24 Vdc power at their TBx terminal block, then
perform the following troubleshooting steps to try to restore
the +24 Vdc power:
a)
First, verify that all four Green indicator LEDs D28,
D30, D32, and D34 are ‘ON’. If not, see sections (1)
and (2) above.
b)
Next, remove the corresponding TBx terminal block
for about 2 minutes and let the effected resettable fuse
cool-down. (This means for the 4-20 mA Temperature
sensors you must unplug
BOTH
of the TBx terminal
blocks of an Input pair to remove all electrical current
flowing through the effected resettable fuse in order for
it to cool-down).
c)
Finally, plug-in the corresponding TBx terminal block,
and see if the resettable fuse holds or then trips again.
If the fuse trips again, then check for a BAD sensor or
BAD wiring going out to that sensor.
Summary of Contents for Electry-Sentry 1
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