PROTECTIONS
INSULATION MONITORING
M
39.10
REV..0-05/01
USE AS TROUBLE INDICATOR:
Placed on the front panel, the insulation monitor (A3)
is a relay which controls continuously the insulation
of the generation a.c. circuits towards the ground.
The device generates internally a continuous 12V
voltage which is applied between the circuit under
control and the ground.
USE AS TROUBLE INDICATOR AND INTERVEN-
TION:
The insulation monitor controls a device (release
coil, contactor, etc.) which opens the whole circuit,
lifting voltage in the whole part of the machine a.c.
generation.
USE OF RI – R22M MODEL:
- To vary the regulation call our Technical Assist-
ance Department
- The LED ON shows that the device is fed.
- Check that it works correctly pressing the TEST
push button
- The LED TRIP will simulate on intervention or
anyway will show the real intervention in case the
insulation fails.
- Reset the circuit pressing the RESET push button
after having checked the plant and removed the
problem cause.
Don not intervene on the setting of the protection
switch. Before using the machine check the ON
warning lamp lighting.
NOTE
!
LEGEND:
A3.1 - Adjustment potentiometer insulation resi-
stance
A3.2 - Manual reset push button
A3.3 - Test push button
A3.4 - Auxiliary fedding presence LED
A3.5 - TRIP LED
A3.2
A3.3
A3.1
A3.5
A3.4
RESET
TEST
ON TRIP
25
50
75
100
k ohm
USE OF SRI/D3 MODEL
- To vary the regulation call our Technical Assist-
ance Department
- The warning light ON shows that the device is
fed.-
- Pressing a long time the Test push-button, the
Fault led lights and the Alarm led twinkles;
- Leaving it, the Alarm led goes off while the Fault
led remains lit. The pressure on the Reset key
brings the device back to initial conditions.
- If the insulation resistance goes down below
the fixed alarm value, the Alarm led twinkles, at
the same time the Alarm contact switches; if the
insulation resistance goes down furtherly and
becomes inferior to the fixed value for the Fault,
the Fault led lights and at the same time both ex-
change contacts switch putting the Fault in activity
and the Alarm at rest.
- After having checked the device and removed
the cause of the problem, re-establish the circuit
pressing the push-button RESET.
LEGEND:
D1 Regulation of Alarm threshold
D2 Regulation of Fault threshold
D3 Led, fault indication
D4 Led feeding indication
D5 Led Alarm indication
D6 Test push-button
D7 Reset push-button
25/05/01 M39GB
Summary of Contents for GE 20 YSX
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