Deif ADL-111Q96/xxVDC Series Installation instructions

DEIF A/S Tel.: [phone]
Frisenborgvej 33, DK-7800 Skive Fax: [phone]
Denmark E-mail: [e-mail]
DEIF A/
S
Installation/operation instructions
Insulation monitor type ADL-111Q96/xxVDC
4189330017B (UK)
•Monitoring of insulation resistance on a DC network
•Working voltage 24V, 110V or 220V DC
•Measuring range 50...0kΩ, 250…0kΩ, 500…0kΩ
•Alarm on exceeding the adjusted set point
•DC auxiliary supply or self-powered
•Balanced insulation error included

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Generally
The ADL-111Q96/xxVDC is intended for insulation monitoring on a DC voltage IT
power network. The special characteristic of an IT power network is the fact that no
live conductor is connected directly to earth. The ADL-111Q96/xxVDC is connected to
the power network by connecting the terminal marked L- to the negative pole. The PE
input is then connected to the safety cable. To be able to monitor any kind of
insulation failure, all accessible conductive building structures must be connected to
the cable PE (protective earth).
Installation
If a test function is requisite, an arrangement based on a known resistor and a push-
button can be mounted as illustrated on the drawing below. The value of the resistor
can be any value from 0Ωto the max. allowed insulation value.
The ADL-111Q96/xxVDC is intended to be supplied from the IT network under
supervision, but it can also be supplied from another source with the same voltage
level as the IT network. If the ADL-111Q96/xxVDC is supplied from a separate voltage
source, the IT network can also be monitored in power-down condition. In this
situation, if no load is connected to the power lines, it will be necessary to make a
connection between the positive and the negative conductor on the IT network by
means of e.g. a low ohmic resistor or a lamp.
Switchboard test arrangement
PE
TEST
312 LPE +
+
*
Instrument Test
resistance
24V 1k
110V
220V
5k
10k
*Instrument shown as
self powered
DC Source
recommended values
*
X2 X1
Relay contact 1,3,2
Supply on No alarm Alarm
NE 1-3 1-2
ND 1-2 1-3

Installation/operation instructions ADL-111Q96/xxVDC
Page 3 of 7 4189330017B (UK)
Note
If an earth fault is present at the positive and the negative conductor at the same time,
the resulting value of the parallel insulation error is indicated on the instrument. This is
also the case if the earth fault at the positive and the negative conductor has exactly
the same size, e.g. if there is an insulation error from the positive conductor of 2k and
at the same time a similar insulation error from the negative conductor, the value on
the instrument will be indicated as 1k.
Connection of DC auxiliary supply
Type: ADL-111Q96/24VDC Type: ADL-111Q96/110VDC Type: ADL-111Q96/220VDC
X1 connected to negative pole X
1 connected to negative pole X 1 connected to negative pole
X2 connected to positive pole X
2 connected to positive pole X 2 connected to positive pole
Label for ADL-111Q96/24VDC
Label for ADL-111Q96/110VDC version
Label for ADL-111Q96/220VDC version

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Dimensions
Panel cutout 92 x 92 + 0.4mm
Configuration of the relay function
The relay contact can be configured to function either as a normally energised contact
(NE) or as a normally de-energised contact (ND). If the ADL-111Q96/xxVDC is
supplied from the IT network under supervision, a disconnection of the IT network will
not result in an alarm if ND function is selected. Please notice that the ADL-
111Q96/xxVDC is factory preset to relay function NE. The figure below shows the
location on the PCB of the S1 switch for selection of either ND or NE relay function.
The PCB is located under the lid.
Example:
• ND is selected as relay function
• Max. 1μF leakage capacitor is selected
S1
IMPORTANT - Use electrostatic discharge
protection!
Sufficient care must be taken to protect the PCB
against static discharges during the configuration.
Once the unit is installed and connected, these
precautions are no longer necessary.
1μF
ND
20μF
NE

Installation/operation instructions ADL-111Q96/xxVDC
Page 5 of 7 4189330017B (UK)
Configuration of the max. leakage capacitor (stray earth capacitance)
Normally, the leakage capacitor is a phenomenon based on the cables in the IT power
network. When the cables are mounted close to the metal structure, e.g. the hull of
the ship, a capacitive coupling is unavoidable. The size of the capacitor can be
measured using insulation test equipment based on a known frequency and a known
test voltage.
If only the cables contribute to the leakage capacitance, the capacitance will be low -
less than 1μF. On the other hand, the leakage capacitance can be higher, if the loads
connected to the power system are equipped with decoupling capacitors, e.g.
electronic equipment. To prevent incorrect insulation monitoring, set the ADL to
accept max. 20μF capacitance, using the S1 switch.
Measuring ranges
The ADL-111Q96/xxVDC can be delivered with 3 different scale ranges dependent on
the voltage level on the IT power network: 50…0k, 250…0k or 500…0k for IT
networks with 24V DC, 110V DC or 220V DC respectively.
Scale range 50…0k
Ri 12k
If the setting on S1 is changed from 1μF to 20μF or vice versa, a
power-up reset is needed before the new setting is accepted. Power-up
reset is performed by disconnecting and reconnecting the aux. supply
(X1 or X2).
The ADL-111Q96/xxVDC is using a pulsating DC voltage connected to
the IT network through a known resistor. The reference of this known
resistor is Ri, and the value is printed on the scale.

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Adjustment of the set point
The requested alarm limit value is set on the ohm scale on the rear of the instrument.
If precise alarm settings are required, a known resistor similar to the desired set point
is connected between L- and PE. Then adjust the potentiometer until an alarm is
transmitted.
Please notice that if the instrument is set to accept a max. 20μF capacitance, the
delay for the alarm will be max. 40 seconds on the 220V version due to the response
time.
Operation
Indicators
The ADL is equipped with 2 LED indicators, one green LED and one red LED. Only
the green indicator marked SUPERVISION is lit when the unit is connected to auxiliary
supply and no insulation error below the set point is detected.
Scale range 250…0k
Ri 55k
Scale range 500…0k
Ri 110k

Installation/operation instructions ADL-111Q96/xxVDC
Page 7 of 7 4189330017B (UK)
The red LED indicator marked FAULT is illuminated, if an insulation error below the
set point is detected.
Response time
The table below illustrates the response time for the different instrument types with
max. leakage capacitor set to 1μF and 20μF respectively.
Type
Setting ADL-111Q96/24VDC ADL-111Q96/110VDC ADL-111Q96/220VDC
1μF 2.0s 3.2s 5.0s
20μF 11.0s 20.0s 40.0s
Fuses
Recommended fuse for aux. supply (X1, X2) max. 2A.
Commissioning
On delivery, the ADL-111Q96/xxVDC is set to 1μF as max. leakage capacitor, and the
relay function is set to NE. If the actual leakage capacitor is higher than 1μF, the ADL-
111Q96/xxVDC will indicate an insulation error. The value of this insulation error
depends on the actual size of the leakage capacitor. To avoid this, set the S1 switch
to position 20μF. If the ADL-111Q96/xxVDC is supplied from the IT network under
supervision, an alarm will occur in case of disconnection of the IT network. If this is to
be prevented, then set the S1 switch in position ND and change the wiring on the
relay contact according to the information in the chapter “Installation”.
Technical specifications
Please see the data sheet, document no. 4921230021.
Errors and changes excepted
If the installation is to be tested by means of a high-voltage
"MEGGER", the wire to the ADL-111Q96/xxVDC at terminal "L-" must
be disconnected before testing is carried out. Omitting this may result
in damage to the ADL-111Q96/xxVDC. Besides, the insulation test will
be affected by the built-in DC voltage generator impedance (Ri).
If the voltage exceeds the max. allowable value, e.g. 31.2V for the 24V
version, the indication on the instrument will be infinite and the green
LED starts flashing. The same indication will occur in situations where
the insulation error is fluctuating. The infinite indication on the
instrument and the flashing LED will remain, until a correct mean value
of the fluctuating insulation error can be determined.
A power-up reset is needed every time the setting 1μF or 20μF is
changed. It is not needed if only the relay function is changed.