QUANTA DQ61 User manual

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Rev 01.14_en
28/12/2012
Temperature Monitoring Unit for Transformers and
Other Electrical Machines
DQ61
User Manual
(Hardware Rel. 2.0 - Firmware Rel. 1.3.3)

Pag. 2
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1General Information_______________________________________________________________ 3
2How to use this manual____________________________________________________________ 3
3Identification Data ________________________________________________________________ 4
4The DQ61 ______________________________________________________________________ 4
4.1 Terms and conditions of intended use ____________________________________________ 4
4.2 Conditions of use not permitted _________________________________________________ 5
4.3 Technical specifications _______________________________________________________ 6
5Funzionamento e uso _____________________________________________________________ 7
5.1 Control Panel _______________________________________________________________ 7
5.2 Rear Panel _________________________________________________________________ 8
5.3 Power Supply _______________________________________________________________ 8
5.4 Electrical Connections ________________________________________________________ 8
5.5 Pt100 probes electrical connections______________________________________________ 9
5.6 Other electrical connections ____________________________________________________ 9
5.7 Relays Functionality __________________________________________________________ 9
5.8 Buzzer features_____________________________________________________________ 10
6Programming___________________________________________________________________ 11
6.1 Normal view _______________________________________________________________ 11
6.2 Access to menu ____________________________________________________________ 11
6.2.1 MAX TEMPERATURE RECORD Menu________________________________________ 11
6.2.2 ALARM SETTING Menu____________________________________________________ 12
6.2.3 ALARM COUNTERS Menu _________________________________________________ 12
6.2.4 DISPLAY MODE Menu_____________________________________________________ 13
6.2.5 USER Menu _____________________________________________________________ 14
6.2.6 SERVICE Menu __________________________________________________________ 15
6.2.7 INSTRUMENT INFO_______________________________________________________ 17
6.2.8 OUTPUT TEST___________________________________________________________ 17
7Remote Control _________________________________________________________________ 18
7.1.1 Communication: Physical Layer ______________________________________________ 18
7.1.2 Communication: Data Layer _________________________________________________ 18
7.1.3 Communication: Application Layer____________________________________________ 18
7.1.4 Controllable Variables Table_________________________________________________ 18
7.1.5 Data types_______________________________________________________________ 18
7.2 Monitorable and Editable Registers Table ________________________________________ 20
7.2.1 Monitorable and Editable Parameters and Variables______________________________ 20
7.3 Read-Only Registers Table ___________________________________________________ 21
7.3.1 Read-Only Variables_______________________________________________________ 21
8Overall Dimensions ______________________________________________________________ 22
9Troubleshooting_________________________________________________________________ 22
10 User Manual Revision History______________________________________________________ 22

Pag. 3
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1 General Information
Before performing any work on the device, ensure you have read and fully understood
this manual.
To ensure safe operation of the product it is necessary that the transport, storage,
installation, use, maintenance and disposal practices are in compliance with the instructions
in this manual.
Each operation on the connections and installation must be performed by qualified and
authorized personnel only. The QUANTA S.r.l. cannot be held responsible for any damage to
people and/or things if have not been complied with all the instructions in this manual.
The product shall be used only for the purpose specified in this manual. Any other use,
besides being forbidden, it could pose a risk to health and/or safety of persons and/or
property and damage to the equipment.
Use only QUANTA S.r.l. original spare parts The use of non-original spare parts will
invalidate your warranty, and might pose a risk to health and / or safety of persons and / or
property.
All rights are reserved. Any form of duplication or distribution of this manual is allowed only
under the express written consent of QUANTA S.r.l.
2 How to use this manual
This manual should be considered part of the unit, consequently it shall always be available for
consultation by the management and maintenance staff. Keep it with care; in case of loss or
damage you may request a copy asking your dealer or directly QUANTA S.r.l. quoting the
model and serial number of the device,

Pag. 4
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3 Identification Data
The identification label is located on the back of the unit.
Figure 1
For technical assistance contact QUANTA S.r.l. using references in the footer of this manual.
4 The DQ61
4.1 Terms and conditions of intended use
The DQ61 is an electronic control unit, designed to be used to monitor and control the temperature of electrical
machines, e.g. medium/high voltage transformers or electrical motors.
Since it is not possible to know in advance what are the real application conditions in which the device will be
utilized, and given the great variability of the fields of application, it is responsibility of the user to determine the
suitability of DQ61 in perform properly the specific application.
QUANTA S.r.l. is available to provide the know-how to help customers in the evaluation of the specific
suitability of the DQ61.
The DQ61 is a device classified under Measure Category III according to EN61010-1,
permanently connected.
The device must be installed inside an electrical panel and shall be placed in proximity
of a switch in order to allow for a swift disconnection from the power supply.
The connection cables, including power cables must be secured and protected against
the danger of direct contact to the operators.
Working on the device shall only be done after power to the panel has been
disconnected.

Pag. 5
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The device must be used only for the use and in the environmental conditions expressly
provided in this manual: Any other use is considered improper and is not permitted. The
use in ways and for purposes other than prescribed in this manual raises QUANTA S.r.l.
from any liability for damage to persons, animals or property.
The device must be used for its intended use, only if in perfect conditions of maintenance. The use is permitted
by qualified and trained personnel only, in strict accordance to current safety regulations and standards for the
prevention of accidents.
In particular, the user should:
verify the compliance of the environment in which the equipment is installed and the related
arrangements for the proper installation/use.
thoroughly understand all the operations necessary for the proper use and the ordinary disposal, and
all the general safety instructions and warnings provided in the manual.
4.2 Conditions of use not permitted
The use of DQ61 in areas classified in category 20, 21 or 22 and / or 0, 1, 2 according to EU Directive
94/9, called Atex, is expressly prohibited.
It is forbidden to use the DQ61 by personnel which is untrained and not aware of the risks related to the
use of the device.

Pag. 6
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4.3 Technical specifications
Power supply
Universal 90-250Vac 50-60Hz and 16…26Vcc/ac, 7VA
Available inputs
N°4 RTD Pt100 –3 wires
Cable lengts compensation
Up to 500m (0.5 mm2)
External connections
Terminals wiring up to AWG 17 for Pt100, up to AWG14 for
power and relays
Temperature range
-20 … +200°C
Accuracy
Better than 0,4°C ±1 digit
Output alarm relays
N°2 SPDT 5A 250V for ALLARM and TRIP
Output Fan relay
N°1 SPDT 5A 250V
Output Fault relay
N°1 SPDT 5A 250V
Display
Graphic OLED 2,4” 128x64 pixel
Keyboard
Touch capacitive
Alarms signaling
With 4 dedicated LED and text message on display
Menu language
Italian, English, French, Espanol, more on request
Unit of measure
°C or °F
Dimensions
Front 96x96mm; depth 115mm
Mounting
Front panel
Panel cut-out
90x90mm
Building according CE directives
2006/95/CEE (Lov Voltage) e 2004/108/CEE (EMC)
Protection against electrical noise
EN61326-1
Dielectric strength
2500Vac for 1 minute
Isolation
Better than 100MOhm at 500Vcc ground -other terminals
Frontal protection
IP40, IP65 optional
Ambient operating temperature
-20 … +60°C
Ambient operating humitity
Max 90% no-condensing
MTBF
Better than 100.000 hours
Data storage
More than 10 years
Recorded data
Each channel Max temperature;
Each alarm number of activactions
Remote control (optional)
Optoisolated RS485, MODBUS RTU protocol
Self-diagnosis, with error signal on the FAULT relay.
Integrated counters (partial and total), for hours of work done.
Ability to schedule the regular switch-on of the fans from the service menu.
FCD function: ability to set an alarm if the temperature change is too fast (°C/s), from the service
menu
Ability to disable alarms activation for probes P1 P2 and P3 from the service menu.
Ability to disable alarm activation for probe P4 from user menu.

Pag. 7
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5 Funzionamento e uso
5.1 Control Panel
Figure 2
Table 1: Panel Layout
1.
Display
In normal operation it displays the measured temperatures.
During programming it guides the user to setup the parameters.
2.
Status Row
Located at the bottom of the display, it shows the operating
condition of the DQ61, alarm conditions particularly.
3.
LED group
The A1 LED indicates that the cooling fan is ON.
The A2 LED indicates an alarm condition.
The A3 LED signals the activation of the tripping relay.
The A4 LED indicates a fault condition within the unit or on the
probes
4.
MENU/ESC Pushbutton
Allows to enter or exit the programming menu.
5.
+ / INCREASE Pushbutton
Increase the value of a selected parameter / Displays the menu
page or the previous line to the current one.
6.
- / DECREASE Pushbutton
Decreases the value of a selected parameter / Displays the menu
page or the following line to the current one.
7.
ENTER/MUTE Pushbutton
In normal operation: Allows to silence the buzzer.
When setting parameters: Confirm the set value and pass to the
next parameter.
1
3
4
5
7
6
2

Pag. 8
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5.2 Rear Panel
Figure 3
Table 2: Terminal Blocks
Terminal Reference
number
1.
1 2 3 4
Common terminal shield for Pt100 probes
2.
5 … 16
Terminals for connection to Pt100 sensors
3.
17 18 19
Optional RS485 Serial Communication
4.
20 21 22
Power Supply 16-26Vac-dc
5.
23 24 25
Power Supply 90-250Vac
6.
26 … 37
Relays Terminal Blocks (5A 250V)
5.3 Power Supply
On the secondary of large transformers may be present very strong transient disturbances, which might exceed
the filters and safeguards built into DQ61 and destroy it; for this reason it is advisable to power it by a
transformer 24VAC or 24VDC power supply. If the power is taken directly from the secondary of the
transformer to be protected, fit a suitable additional filter. For more information please contact QUANTA S.r.l.
5.4 Electrical Connections
For the connection of the measuring sensors (Pt100) it is essential to observe the following rules:
They must be placed separate from the power cables.
They must be made with shielded twisted conductors.
Must have a minimum cross section of 0.5 mm2.
Must have conductors silver or tin.
1
2
6
5
4
3

Pag. 9
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5.5 Pt100 probes electrical connections
Make Pt100 sensors connections as shown in the following diagram, using shielded cables:
Pt100 Pt100
Bianco White Rosso Red Rosso Red Schermo Shield
1 12 2
3 3
4 4
5 5
6 67 7
Figure 4
(Figure 4 shows the connection of the single P1 probe). If they are available two-wire Pt100, connect terminals
6 and 7 together.
Do the same with the other probes, connecting to terminals 8 to 16 with the screens connected to terminals 2, 3
and 4.
The probes P1, P2 and P3 are those which measure the temperature of the three windings in a three-phase
transformer, while the probe P4 measures the temperature of the magnetic core. See the diagram below:
Pt100
P1 Pt100 P2
Pt100 P4
Pt100
P3
DQ61
Figure 5
5.6 Other electrical connections
Connect the low safety voltage power supply to terminals 21 and 22 or connect the mains supply to terminals
23, 24 and 25.
WARNING: even if the power supply applied to terminals 21 and 22 is at low safety voltage levels, the ground
terminal 24 must be connected, in order to maintain the effectiveness of noise filters and other internal devices.
5.7 Relays Functionality
The relays A1 A2 and A3 are normally at rest, while the relay A4 is normally activated, according to the
diagrams of example in Figure 6 and Figure 7.
The output A1 (signaled by LED FAN) switches when one of the sensors reaches the activation
temperature of the fan.

Pag. 10
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The relay A2 (signaled by the ALARM LED) switches when the probe reaches the alarm temperature.
Enabling this relay can be delayed by setting a time in the user menu.
The relay A3 (signaled by LED TRIP) switches when one of the probes reaches a temperature of
release.
The working mode of this relay can be controlled by the user menu:
Standard mode: It is active when you reach the alarm condition and remains active until the
condition persists.
Latching mode: Keeps the alarm indefinitely, even to the end of the cause of the alarm.
Pulse mode: It is activated for a predetermined time and then returns to the rest condition.
The relay A4 (indicated by LED FAULT) is always on and going off to signal a DQ61 fault condition or a
fault condition in one or more probes.
A1 A2 A3 A4
26 27 28 29 30 31 32 33 34 35 36 37
Figure 6
Relay in its rest position; DQ61 ON
A1 A2 A3 A4
26 27 28 29 30 31 32 33 34 35 36 37
Figure 7
Fan activated; Fault DQ61 and/or fault probe
5.8 Buzzer features
The buzzer is activated at the reach of alarm set-point (ALARM), which also activates the relay A2, and beeps
intermittently slow until the end of cause for alarm.
The buzzer sounds intermittently fast, when it reaches the release set-point (TRIP) which activates the relay
A3.
The buzzer sounds a continuous tone to indicate the fault condition of a Pt100 probe.
The MUTE key mute the buzzer when alarm is active. In the state of silencing the buzzer wakes up in the
presence of new alarm events.
The activation of the buzzer on alarm can be inhibited by the service menu..
Type of sound
Cause reported
Continuous
One or more probes are faulty
Intermittent slow
Active alarm relay (ALARM)
Intermittent fast
Active tripping relay (TRIP)

Pag. 11
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6 Programming
6.1 Normal view
In normal operation, set as the factory default, the display looks like this:
At the top, the display shows the four measured temperatures, while the bottom row summarizes the status of
the DQ61.
6.2 Access to menu
Press the MENU key to access the main menu of programming:
With the keys and you place the control on the desired line, with the keyyou access the submenu.
When you are inside a menu, press the MENU button to exit and return to the main display.
The row can be reached by pressing the key after the row .
If no operations are done on the keyboard for about 30 seconds, DQ61 autonomously back to normal view.
6.2.1 MAX TEMPERATURE RECORD Menu
This menu shows the maximum temperatures recorded. Pressing the keytwice, you can reset the recorded
values.



Pag. 12
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6.2.2 ALARM SETTING Menu
This menu shows the temperature set point for fan, alarm and tripping. The settings are common to the probes
P1, P2 and P3, while P4 probe has a setting dedicated. By pressing the keys and you place the cursor on
the desired set point; the keyleads to a submenu that lets you change its value. After changing the value,
press the button again to save the change or press the key MENU to return without the change.
6.2.3 ALARM COUNTERS Menu
This menu shows how many alarms there were for different set-points. Pressing the keytwice, you can reset
the counters.



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6.2.4 DISPLAY MODE Menu
This menu allows you to set the screen to normal working mode, as it may be needed. Pressing the keys and
you place the cursor on the screen that you want; pressing the keytwice, you select and confirm the
choice. The choices are as follows:
Current temperature of probes.
All measured temperatures are displayed
simultaneously on the display.
Highest temperature.
The display shows only the highest temperature
measured.
Cyclic temperatures.
All the temperatures measured are shown in
succession, one after the other with an interval
of about four seconds.
Manual Scan.
Acting with the keys and you select the
displayed temperature.



Pag. 14
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6.2.5 USER Menu
This menu shows the possible settings allowed to the user.
Pressing the keys and you can place the cursor on the entry to change; with the key you access a sub-
menu that has the options available. You select the desired option using the buttons and ; use the key to
select it and save.
.
Sets the hysteresis on the alarm temperature between 1 and 20 °C (default 5 °C).
For example, if a given alarm threshold is set to 120 °C and the hysteresis at 5 °C, DQ61 signal an alarm
when the temperature exceeds 120 °C and will continue to report it until the temperature drops below 115
°C
.
Sets the time in seconds (between 0 and 120, default 0) for which the alarm condition must persist before
an alarm is reported. For example, if this parameter is set to 60 sec., raise in temperature above the
thresholds set for periods of less than 60 seconds will not give the alarm.
.
If set to YES (default NO), once in the conditions for which the alarm TRIP is activated, this alarm (alarm
LED on the display and relay contact A3) continues to exist even if the temperature returns to normal until
the key is not pressed by an operator.
.
This parameter allows you to set the time for which the relay contact A3 (TRIP) is activated in case of
alarm: if it is set to 0 (default), the relay is activated as long as the alarm condition persists, but if you set a
value between 1 and 120 seconds, in case of alarm TRIP the relay will be activated only for that time even
if the alarm condition persists. This function, if the value is not 0, takes precedence over latching function.
.
This feature allows you to disable the alarm activation derived from probe 4. If the probe is connected its
temperature is still shown on the display, but if it is absent, no alarms are reported. The alarm condition is
signaled disabled on the display in the status line.



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This feature allows you to use the DQ61 to monitor only 3 temperatures without being warned for failure or
absence of the fourth probe.
.
Sets the menu language choosing among ITALIAN, ESPANOL, FRANCAIS, ENGLISH.
6.2.6 SERVICE Menu
This menu can only be accessed with a key password (by pressing MENU, MENU, MENU, ,
MENU,MENU, MENU, ).
This menu is reserved for technical assistance.
In this menu you can set some special features of the DQ61:
Enable FCD feature and choice of rate of temperature rise that generate the alarm
.
Default 0 °C/s.
It may set a value of rate of rise that generates alarm, between 0 and 30 °C/s. Setting the value to 0
exclude the function and the corresponding alarm is disabled.



Pag. 16
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Activation interval of the fan (independent of temperature)
.
Default 0 hours.
You can set a value between 0 and 1000h. Setting the value 0, to disable this function: The fan will turn
on anyway as a result of exceeding the alarm FAN temperature; setting a value other than 0, for
example. 6h, the fan will turn on every 6 hours and will remain on for the time set to the next parameter
(P13).
FAN ON Time (See parameter P12).
.
Default 5 minutes.
Determines how long the fan stays on if the parameter P12 is different from 0.
Probe 1 Enable. .
Default YES.
Setting the value to NO exclude the alarm probe 1, while remaining visible indication of its temperature
on the display.
This condition is indicated on the status line with the message “Alarms probe T1 OFF”.
The parameters from P14 to P17 allow you to use DQ61 with a number of probes between 1 and 4
without having to worry about the alarms generated by the probes that may be missing.
Probe 2 Enable. .
Default YES.
Setting the value to NO exclude probe 2 alarm, while the temperature on the display remains visible.
This condition is indicated on the status line with the message “Alarms probe T2 OFF”.
Probe 3 Enable. .
Default YES.
Setting the value to NO exclude probe 3 alarm, while the temperature on the display remains visible.
This condition is indicated on the status line with the message “Alarms probe T3 OFF”.
Adjusting the display brightness in the working mode.
.
Default 240.
Adjusting the display brightness in the stand-by mode.
.
Default 60.
The parameters P8 and P19 are connected to each other in the following way:
P18 can be set between P19+1 and 255;
P19 can be set between 0 and the value of P18-1.
ID. MODBUS. .
Default 1. (Allowed values: from 1 to 247).
If the RS485 MODBUS option is not installed, the value indicated is and will not be editable.
RS485 MODBUS Baud rate.
.

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Default 19.200. (Allowed values: between 1.200 and 38.400 baud).
If the RS485 MODBUS option is not installed, the value indicated is and will not be editable.
Choice of unit between °C and °F.
.
Default °C.
Buzzer Enable on Alarm .
Default YES.
Warning: when the buzzer is disabled it does not sound on activation relay ALARM, TRIP relay and
relay FAULT.
Default Setting .
Default NO.
This selection resets the device to factory settings.
6.2.7 INSTRUMENT INFO
This menu shows the software revision and hours of work. Pressing twice the key you can reset the partial
working hours counter. The total counter can not be reset.
6.2.8 OUTPUT TEST
This menu allows you to check the operation of the output relays and LEDs associated with. You select the
relay to test using keys and , and then pressing the keyswitching from off to on and vice versa. Pressing
the MENU button the test ends, the relays and the LEDs resume their work status
By entering this menu, any alarms are turned off to allow the test and are reactivated at the return of the normal
operating condition.



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7 Remote Control
Through the RS485 port (when the corresponding option board is installed) DQ61 can be controlled by an
External manager communicating with MODBUS protocol.
7.1.1 Communication: Physical Layer
Asynchronous serial communication, half-duplex, 19200bps (default), 8 data bit (LSB first), even parity, 1 stop-
bit.
7.1.2 Communication: Data Layer
Protocol MODBUS Slave over serial line RTU mode.
Please refer to MODBUS over serial line specification and implementation guide V1.02 of 20/12/2006 by
Modbus.ORG.
The address of the MODBUS Slave is the ID MODBUS set from the Service Menu.
The Protocol Data Unit (PDU) exchanged with the upper level are associated with the address above, and
check for error checking (CRC), forming the Application Data Unit (ADU).
7.1.3 Communication: Application Layer
MODBUS Application level second MODBUS Application Protocol Specification V1.1b of 28/12/2006 by
Modbus-IDA.ORG for the management of PDUs exchanged with the lower levels.
The application layer defines the MODBUS PDU as formed by the following fields:
Function Code –Function code indicates the type of action required by the Client to the Server.
Data –Field data concerning the operation of control or monitoring required by the Client to the Server.
Are supported only the following function codes:
Function Code
Description
03 (0x03)
Read Holding Registers
16 (0x10)
Write Multiple Registers
As described in detail below, the table of Holding Registers contains not only all the variables that can be
monitored and modified (read-write) by the External Manager, but also the variables monitored only (Read-
Only) allocated all together in a separate address space, which in this case shall be extended to the maximum
extent permitted by MODBUS (0x0000 to 0xFFFF). Is therefore rejected each write request involving the
records Read-Only in that address space.
Typical MODBUS requests for diagnostic are not handled over serial lines (08 (0x08) Diagnostics, 11 (0x0B)
Get Comm Event Counter and 12 (0x0C) Get Comm Event Log).
7.1.4 Controllable Variables Table
The data of all controllable variables are mapped into a table of 16-bit registers, depending on the model
MODBUS data representation.
7.1.5 Data types
The data is divided into the following types:
BOOL –binary value 0 or 1

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CHAR –alphanumeric character (0 ÷ 255)
BYTE –8-bit positive integer (0 ÷ 255)
WORD –16-bit positive integer (0 ÷ 65535)
BITMAP –16-bit words corresponding to 16 flags in order from 0 to 15 (for each bit logic is: 0 = off, 1 =
on)
INT –16-bit signed integer (-32768 ÷ 32767)
DWORD –32-bit positive integer (0 ÷ 4294967295)
LONG –32-bit signed integer (-2147483648 ÷ 2147483647)
FLOAT –IEEE 754 single-precision floating point number (±1.175494351E–38 ÷ ±
3.402823466E+38)
For the type CHAR and BYTE, the 16-bit register that contains it has the high byte set as zero, unless it is an
array.
For type DWORD, LONG and FLOAT the two 16-bit registers that represent the value in the table are sorted
according to the scheme Big-Endian (Motorola): The first register contains the high word, the second register
contains the low word.
For arrays of CHAR and BYTE, each 16-bit register employed from the array contains two elements: The k-th
element in the low byte and the (k +1)-th element in the high byte, with k = 0.1, 2, ... index of characters in the
array. The element of null value (0x00) is taken as a string terminator in arrays of CHAR.
The notation "[n]" indicates the size of an array of n elements of a certain type.

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7.2 Monitorable and Editable Registers Table
7.2.1 Monitorable and Editable Parameters and Variables
Address
Type
Description
0x0000
BITMAP
Bitmap configuration flag:
Bit0. Default configuration
Bit1. TRIP latch Enabled
Bit2. Probe T1 Enabled
Bit3. Probe T2 Enabled
Bit4. Probe T3 Enabled
Bit5. Probe T4 Enabled
Bit6. Unit of Measure = °F
Bit7. Buzzer on Alarm Enabled
Bit8.
Bit9.
Bit10.
Bit11.
Bit12.
Bit13.
Bit14.
Bit15.
0x0001
INT
FAN Probes 1/2/3 (°C o °F) Set-Point
0x0002
INT
FAN Probe 4 (°C o °F) Set-Point
0x0003
INT
ALARM Probes 1/2/3 (°C o °F) Set-Point
0x0004
INT
ALARM Probe 4 (°C o °F) Set-Point
0x0005
INT
TRIP Probes 1/2/3 (°C o °F) Set-Point
0x0006
INT
TRIP Probe 4 (°C o °F) Set-Point
0x0007
BYTE
Hysteresis (°C o °F)
0x0008
BYTE
FCD (°C/s or °F/s) Set-Point
0x0009
BYTE
Alarm Delay (s)
0x000A
BYTE
TRIP Pulse Duration (s)
0x000B
WORD
Auto Ventilation Period (h)
0x000C
BYTE
Auto Ventilation Time (min)
0x000D
DWORD
Partial Working Hours (Reset only)
0x000E
0x000F
INT
Max Temperature T1 (°C o °F) (Reset only)
0x0010
INT
Max Temperature T2 (°C o °F) (Reset only)
0x0011
INT
Max Temperature T3 (°C o °F) (Reset only)
0x0012
INT
Max Temperature T4 (°C o °F) (Reset only)
0x0013
WORD
Number of Activation of Relays FAN (Reset only)
0x0014
WORD
Number of Activation of Relays ALARM (Reset only)
0x0015
WORD
Number of Activation of Relays TRIP (Reset only)
0x0016
WORD
Number of Activation of Relays FAULT (Reset only)