Main applications
• Plastics extrusion lines
and injection moulding
machines
• Polymerization plant for
synthetic fibre production
• Rubber moulding
machinery
• Driers for ceramics and
components for the
building industries
• Chemical and
pharmaceutical industries
• Industrial electric furnaces
• Food processing plants
GT 25 / 40 / 50 / 60 / 75 / 90 / 120A
SOLID STATE RELAYS WITH ANALOG CONTROL
Main features
• Command input from analogue voltage
or current signal or potentiometer.
• Switching at voltage zero crossing.
• Partialization of wave train power with
dynamically optimized time cycle.
• Antiparallel double SCR
• 2 led for supply indication, “ON” state,
1 optional LED for load interrupt alarm
• 4000V isolation between input circuit
and power output
• MOV (varistor)
• Optional monitoring of interrupted load
PROFILE
The GT family of solid-state relays has
been designed with the aim of providing
very accurate control of the load thanks
to an analog control input, in voltage
at 0…5V; 0…10V or in current at
0…20/4…20mA or a potentiometer (from
1KΩ to 10 KΩ).
The electronic design ensures that the
cycle time for proportioning the power is
automatically optimized.
Il numero di periodi che il GT fornisce
al carico (“treni d’ onda”) per un
certo valore di segnale di ingresso, è
calcolato in modo da essere il minimo
possibile, pur mantenendo la precisione
necessaria.
The number of cycles that the GT
supplies to the load (wave trains) for
a given input signal is calculated to be
the minimum possible to maintain the
necessary accuracy.
The GT can be used in three phase
systems, using master-slave control
architecture in which the control signal
drives only one GT (master) and this unit
supplies the synchronized signals to the
other slaves. Two GS modules can also
be used as slaves (logic control).
A load interrupt control option (HB)
is available without having to use an
external current transformer; alarm limit
is settable with trimmer and yellow LED
signal, with voltage-free contact, normally
open.
The GT solid-state relay has a green
LED to indicate the presence of the
24Vac power supply and a red LED
to indicate the switching based on the
analog control input signal.
The LED signal will be continuous (off at
minimum, on at maximum) at the ends of
the scale, pulsing for intermediate values.
The units offer optional accessoires for
panel mounting, fuses and fuseholders,
current transformer, isolation
transformers.
Use the relè with an opportune heatsink
(see section accessories).
TECHNICAL DATA
General features
Category of use AC1
Nominal voltage
- 480Vac (max. range 24...530Vac)
Nominal frequency: 50/60Hz
Non-repetitive voltage: 1200Vp
Zero switching voltage: ≤ 20V
Voltage drop at nominal current ≤
1.4Vrms
Power factor = 1
Control inputs
Voltage: 0...5Vdc, 0...10Vdc
(impedance ≥100KΩ)
Current: 0...20mA, 4...20mA
(impedance 125Ω)
Potentiometer: da1K a 10KΩ
(auto-fed by GT)
Outputs
GT 25 (SCR version)
Nominal currents of the device with
opportune heatsink in continuous work:
25A
Non-repetitive overcurrent t=20 ms: 400A
2
I
t for blowout: ≤ 645A2s
dV/dt critical with output deactivated:
1000V/µs
GT 40 (SCR version)
Nominal currents of the device with
opportune heatsink in continuous work:
40A
Non-repetitive overcurrent t=20 ms: 600A
2
I
t for blowout: ≤ 1010A2s
dV/dt critical with output deactivated:
1000V/µs
GT 50 (SCR version)
Nominal currents of the device with
opportune heatsink in continuous work:
50A
Non-repetitive overcurrent t=20 ms: 1150A
2
I
t for blowout: ≤ 6600A2s
dV/dt critical with output deactivated:
1000V/µs
GT 60 (SCR version)
Nominal currents of the device with
opportune heatsink in continuous work:
60A
Non-repetitive overcurrent t=20 ms: 1150A
2
I
t for blowout: ≤ 6600A2s
dV/dt critical with output deactivated:
1000V/µs
GT 75 (SCR version)
Nominal currents of the device with
opportune heatsink in continuous work:
75A
Non-repetitive overcurrent t=20 ms: 1300A
2
I
t for blowout: ≤ 8000A2s
dV/dt critical with output deactivated:
1000V/µs
GT 90 (SCR version)
Nominal currents of the device with
opportune heatsink in continuous work:
90A
Non-repetitive overcurrent t=20 ms: 1500A
2
I
t for blowout: ≤ 11200A2s
dV/dt critical with output deactivated:
1000V/µs
GT 120 (SCR version)
Nominal currents of the device with
opportune heatsink in continuous work:
120A (complete with fan and standard
thermostat).
Non-repetitive overcurrent t=20 ms: 1500A
2
I
t for blowout: ≤ 11200A2s
dV/dt critical with output deactivated:
1000V/µs
Isolation
Rated isolation voltage input/output:
4000Vac
Power supply:
24Vac ±10%, 50/60 Hz
Absorption: 1.5VA
Max. isolation voltage: 300Vdc
Options:
Interrupted HB load alarm.
Controls the load by measuring current
on a shunt inside the device.
The alarm limit is set with a multirev
monorev trimmer.
The alarm output is obtained by means of
a solid state relay.
The contact is normally open (max. 30V,
150mA, conduction resistance 15W).
Thermal features
GT 25
Junction temperature: ≤ 125°C
Rth junction/case: ≤ 1.25 K/W
Rth junction/ambient: ≤ 12 K/W
GT 40
Junction temperature: ≤ 125°C
Rth junction/case: ≤ 0.65 K/W
Rth junction/ambient: ≤ 12 K/W
GT 50
Junction temperature: ≤ 125°C
Rth junction/case: ≤ 0.35 K/W
Rth junction/ambient: ≤ 12 K/W
GT 60
Junction temperature: ≤ 125°C
Rth junction/case: ≤ 0.35 K/W
Rth junction/ambient: ≤ 12 K/W
GT 75
Junction temperature: ≤ 125°C
Rth junction/case: ≤ 0.3 K/W
Rth junction/ambient: ≤ 12 K/W
GT 90
Junction temperature: ≤ 125°C
Rth junction/case: ≤ 0.3 K/W
Rth junction/ambient: ≤ 12 K/W
GT 120
Junction temperature: ≤ 125°C
Rth junction/case: ≤ 0.25 K/W
Rth junction/ambient: ≤ 12 K/W
Solid State Relay Dissipated Power
Calculation
Singol-phase static relay
Pds = 1.4 * IRMS [W]
IRMS = singol phase load current
Heatsink thermal resistance
Calculation
Rth = (90°C - T.amb. max) / Pd
where Pd = dissipated power
T.amb.max = max air temperature inside
the electrical cabinet.
Use a heatsink with thermal resistance
inferior to the calculated one (Rth).
Ambient conditions
• Working temperature: 0 to 80°C.
• Max. relative humidity: 50% at 40°C
• Max. installation altitude:
2000m asl
• Pollution level: 2
• Storage temperature: -20..85°C
Installation notes
- The heat sink must be grounded.
- The device must be protected by an
appropriate high-speed fuse (accessory).
- Applications with solid state power units
must also include an automatic safety
switch to cut out the load power line.
- Protect the solid state relay by using an
appropriate heat sink (accessory).
The heat sink must be sized according to
room temperature and load current (see
the technical documentation).
- Procedure for mounting on heat sink:
The module-heat sink contact surface
must have a maximum planarity error
of 0.05mm. and maximum roughness of
0.02mm. The fastening holes on the heat
sink must be threaded and countersunk.
Attention: spread 1 gram of
thermoconductive silicone (we
recommend DOW CORNING 340
HeatSink) on the dissipative metal
surface of the module.
The surfaces must be clean and
there must be no impurities in the
thermoconductive paste.
Alternately tighten the two fastening
screws until reaching a torque of 0.60
Nm for the M4 screws and 0.75 Nm for
the M5 screws.
Wait 30 minutes for any excess paste to
drain.
Alternately tighten the two fastening
screws until reaching a torque of 1.2 Nm
for the M4 screws and 1.5 Nm for the M5
screws.
We advise you to randomly check for
proper installation by dismantling the
module to make sure there are no air
bubbles under the copper plate.
Limits of use
• dissipation of thermal power of device
with restrictions on temperature of
installation site.
• requires exchange with outside air
or an air conditioner to transfer
dissipated power outside the panel.
• installation restrictions (distances
between devices to guarantee dissipation
by natural convection).
• max. voltage limits and derivative
of transients in line, for which the
solid state unit has internal protection
devices (depending on model).
• presence of dispersion current
< 3mA for SCR version GS
< 4mA for TRIAC version GS
(max. value with rated voltage
and junction temperature of 125°C).
WORKING TYPOOLOGY
“Zero crossing” with variable cycle time
Examples of the operation of the GT for different values of the input drive signal and the consequent different cycle times
(100msec and 40msec respectively).
V
V
Example of input at 20% = 2V (IN 0-10V) or 4mA (IN 0-20mA)
V=Voltage across load
Logic output control for GT
Example of input at 50% = 5V (IN 0-10V) or 10mA (IN 0-20mA)
V=Voltage across load
GT thermal protection
Control
input
ON
OFF
t
Red LED ONRed LED
Thermal alarm
t
V = Load voltage
t
Thermal protection
activation
FACEPLATE DESCRIPTION
g
c
b
f
e
d
a
Synchronism signal for
Master/Slave connection
Alarm output
(solid state relay, HB option)
Green LED (power on),
Red LED (GT running)
Red LED (thermal alarm), yellow LED
(load interrupt alarm, HB option)
Monorev trimmer for minimum
calibration of input signal
Monorev trimmer for calibration of load
interrupt (HB) alarm limit
LINE connection LOAD connection
- control signal
+ control signal
Reference voltage for potentiometer power supply (+ 10V)
24 Vac 50/60 Hz power terminal
Dip switch for selection of input signal
(S1, S2, S3)
Monorev trimmer for maximum
calibration of load signal
Reference connection of 230V line voltage
(HB option with 150V to 300V load)
Reference connection of 480V line voltage (HB option
with 300V to 530V load)
CALIBRATION PROCEDURE OF THE INPUT SIGNAL
The solid-state power unit, Gt, is supplied factory calibrated for 0..5V, 0..10V, 0..20mA, 4..20mA, 10Kohm potentiometer.
Minimum and maximum values are adjusted with two monorev trimmers (d,e).
Input signal type is selected with the adjustment f dip switches (S1,S2,S3).
Control signal Dip Switch Position
e
S1 S2 S3
0...5Vdc OFF OFF ON
0...10Vdc ON OFF ON
0...20mA OFF ON ON
4...20mA OFF ON OFF
d
96%
82%
18%
4%
V/mA
In
V/mA
In
0-5V
0-10V
0-20mA
4-20mA
T
f
S1-S3
On
Off
Rin
100K�
100K�
125�
125�
Minimum adjustment trimmer (d) turned fully counterclockwise sets the start conducting limit at 4% of the signal; turned fully
clockwise, the minimum conducting limit is set at 18% of the input signal.
Maximum adjustment trimmer (e) turned fully clockwise sets the full conducting limit at 96% of the signal; turned fully
counterclockwise, the full conducting limit is set at 82% of the input signal.
CALIBRATION PROCEDURE OF THE INTERRUPTED LOAD ALARM
The interrupted load alarm function enables the GT to diagnose a variation of the load current (compared to a set limit),
distinguishing it from one caused by a change in grid voltage. The solid state power unit must therefore be supplied with the
voltage applied to the load terminals, i.e.: LOAD (L2): already connected internally;
LINE (h or i): connect terminal h for voltages from 150 to 300V; connect terminal i for voltages from 300 to 530V.
The alarm activates (relay closed and yellow alarm LED on) when the current, during the conduction of the device, falls below
a preset level that may be adjusted using the trimmer on the faceplate.
Calibration procedure (refer to the faceplate description drawing)
1) Use the adjustment system (or a calibrator) in order to supply the maximum signal (100% conduction or thered “ON” LED
always illuminated). As an alternative, you can configure the GT to 0-10 V DC input configuration and connect terminals 5
and 6.
2) Use a current sensing pliers to check that the load current is at rated level.
3) Turn alarm limit adjustment trimmer (g) fully clockwise. Check that yellow alarm LED (b) turns on.
4) Slowly turn trimmer (g) counterclockwise until the alarm LED turns off.
5) Turn the trimmer counterclockwise another 1/10 of a turn (1 notch on the scale).
In this way, the alarm limit is set below 10% of the rated load current.
N.B:
the partial load break alarm function operates with power partialization exceeding 15%. For partializations below 20%, tripping
times increase due to the reduced load activation time. For correct operation of the option, the load current has to exceed 30%
of rated current for the GT.
Notes on use of the GT with the digital On/Off control
- The logic control signal has to be connected with the correct polarities to terminals 4 and 5 of the analog input.
- Turn minimum adjustment trimmer (d) fully counterclockwise and maximum adjustment trimmer (e) fully clockwise.
- Set the 3 dip switches (f) to off.
For applications with a very short work cycle, you can drive the solid state group by means of the Master/Slave signal by
driving it with a digital signal (OFF = 0 V dc; ON = from 4 V dc to 10 V dc)
Inhibiting the GT
You can inhibit operation of the GT by means of the Master/Slave signal.
To inhibit, connect control signal - (4) with the synchronism signal for Master/Slave connection (3).
Notes on use of the GT in Master/Slave configuration
The GT can be used as a master to drive other solid state groups (slaves). With Master/Slave signal (3), you can drive up to 9
GTs (see connection examples for GT solid state power relays with three-phase load). You can also use a GT to drive GS solid
state power relays (maximum of 2), as shown in the connection diagrams for GT/GS solid state power relays with three-phase
load (attention: the HB option cannot be used for a three-phase application with neutral).
DIMENSIONS AND CUT-OUT
60 mm
31
47.5 mm 26 mm
Ground
GT 25 - 40 - 50 - 60 - 75 - 90 - 120A
TEMPLATE DIMENSIONS
60 mm
L2
Load
Accessory
LAB-1
100mm
24 Vac
87
Depth 34 mm. Weight 200gr.
CONNECTION EXAMPLES
i
Line
480 V
0..10V
0..5V
4..20mA
0..20mA
GT 25A/480 Vac
AC1 50/60 Hz
Analog
Input
+10 Vdc
OutSupply
564
L1
h
Line
Line
230 V
g Alarm Adj
f Input selection
e Max Adj
d Min Adj
c Reset Alarm
AL
PWR ON
Alarm
Out
Master
Slave
30 Vdc/ac
2
100 mm
Single-phase connection (command input from analog signal or potentiometer)
Neutral
Phase
* *
Connections regarding the
*
load interrupted option (see
paragraph “Interrupted load
alarm)
Note: connect h or i
according to the load
tension.
Controller
Digital output
0-20mA
4-20mA
0-10Vdc
0-5Vdc
24Vac 1,5VA
Potentiometer
Load
Load
24 Vac
Supply
L2 hL1i
+10 Vdc
78
Line
480 V
0..10V
0..5V
4..20mA
0..20mA
GT 25A/480 Vac
AC1 50/60 Hz
Analog
Out
Input
AL
PWR
456
Line
230 V
g Alarm Adj
f Input selection
e Max Adj
d Min Adj
c Reset Alarm
Master
Slave
3
Line
ON
Alarm
30 Vdc/ac
2
Fuse
Out
1
*
Relay output - Alarm
(solid state relay)
CONNECTION EXAMPLES
Phase R
Star or delta three-phase connection without neutral, with control of two phases.
Phase S
Phase T
Ground
Connections regarding the
*
* * * *
load interrupted option (see
paragraph “Interrupted load
alarm)
Note: connect h or i
according to the load
tension.
L2
i
Line
480 V
0..10V
0..5V
4..20mA
0..20mA
GT 25A/480 Vac
AC1 50/60 Hz
Out
67 5
hL1
Line
230 V
g Alarm Adj
f Input selection
e Max Adj
d Min Adj
c Reset Alarm
AL
PWR ON
Analog
Master
Input
Slave
4321
Digital output
0-20mA
4-20mA
0-10Vdc
0-5Vdc
Controller
Relay output - Alarm
(Solid state relay)
Three-phase connectionStar connection
Potentiometer
24Vac 1,5VA
*
Load
24 Vac +10 Vdc
Supply
8
Star or delta three-phase connection without neutral, with control of three phases.
Fuse
L2
i
Line
Alarm
30 Vdc/ac
Load
Line
480 V
0..10V
0..5V
4..20mA
0..20mA
GT 25A/480 Vac
AC1 50/60 Hz
PWR ON
24 Vac +10 Vdc
Supply
8
Analog
Input
Out
67 5
Out
hL1
Line
Line
230 V
g Alarm Adj
f Input selection
e Max Adj
d Min Adj
c Reset Alarm
AL
Alarm
Master
Slave
30 Vdc/ac
4321
Fuse
Out
Phase R
Phase S
Phase T
Ground
Connections regarding the
*
load interrupted option (see
paragraph “Interrupted load
alarm)
Note: connect h or i
according to the load
tension.
Controller
Digital output
0-20mA
4-20mA
0-10Vdc
0-5Vdc
Load
Potentiometer
24Vac 1,5VA
* * * * * *
Fuse Fuse Fuse
L1hiL2
Line
480 V
0..10V
0..5V
4..20mA
0..20mA
GT 25A/480 Vac
AC1 50/60 Hz
Analog
Input
Out
230 V
AL
45678
Line
g Alarm Adj
f Input selection
e Max Adj
d Min Adj
c Reset Alarm
Master
Slave
Line
30 Vdc/ac
Load
480 V
GT 25A/480 Vac
ONPWR
Alarm
Out
123
+10 Vdc24 Vac
Out
Supply
Load
+10 Vdc24 Vac
Supply
Line
0..10V
0..5V
4..20mA
0..20mA
AC1 50/60 Hz
L1hiL2
Line
Line
230 V
g Alarm Adj
f Input selection
e Max Adj
d Min Adj
c Reset Alarm
AL
ONPWR
Analog
Alarm
Master
Input
Slave
30 Vdc/ac
45678
Load
Line
480 V
0..10V
0..5V
4..20mA
0..20mA
GT 25A/480 Vac
AC1 50/60 Hz
Out
123
+10 Vdc24 Vac
Out
Supply
L1hiL2
Line
Line
230 V
g Alarm Adj
f Input selection
e Max Adj
d Min Adj
c Reset Alarm
AL
ONPWR
Analog
Alarm
Out
Master
Input
Slave
30 Vdc/ac
45678
123
Relay output - Alarm
(Solid state relay)
*
CONNECTION EXAMPLES
Phase R
Phase R
Three-phase star connection with neutral.
Phase S
Phase T
Neutral
Ground
Connections regarding the
*
load interrupted option (see
paragraph “Interrupted load
alarm)
Note: connect h or i
according to the load
tension.
*
* * * * *
Fuse
L1
L2
Load
Line
480 V
0..10V
0..5V
4..20mA
0..20mA
GT 25A/480 Vac
AC1 50/60 Hz
Line
230 V
g Alarm Adj
f Input selection
e Max Adj
d Min Adj
c Reset Alarm
Line
L1
i
h
i
Line
480 V
0..10V
0..5V
4..20mA
0..20mA
GT 25A/480 Vac
AC1 50/60 Hz
h
Line
230 V
g Alarm Adj
f Input selection
e Max Adj
d Min Adj
c Reset Alarm
Line
L2
Load
Fuse
Fuse
L1
i
Line
480 V
0..10V
0..5V
4..20mA
0..20mA
GT 25A/480 Vac
AC1 50/60 Hz
Carico
h
Line
230 V
g Alarm Adj
f Input selection
e Max Adj
d Min Adj
c Reset Alarm
Line
L2
Load
Digital output
0-20mA
4-20mA
0-10Vdc
0-5Vdc
Controller
Relay output - Alarm
Potentiometer
24Vac 1,5VA
*
AL
ONPWR
Analog
Alarm
Out
Master
Input
+10 Vdc24 Vac
Slave
Supply
30 Vdc/ac
Out
45678
123
AL
ONPWR
Analog
24 Vac
+10 Vdc
Supply
Out
Alarm
Out
Master
Input
Slave
30 Vdc/ac
45678
123
AL
ONPWR
Analog
24 Vac
+10 Vdc
Supply
Out
Alarm
Out
Master
Input
Slave
30 Vdc/ac
45678
123
(solid state relay)
Three-phase connection (triangle or star) without neutral, with control of two phases using one GT in Master configuration
and one GS in Slave configuration.
Phase S
Phase T
Ground
Connections regarding the
*
* *
load interrupted option (see
paragraph “Interrupted load
alarm)
Note: connect h or i
according to the load
tension.
Star connection
Three-phase connection
L2
i
Load
Line
480 V
0..10V
0..5V
4..20mA
0..20mA
GT 50A/480 Vac
AC1 50/60 Hz
hL1
Line
230 V
g Alarm Adj
f Input selection
e Max Adj
d Min Adj
c Reset Alarm
Fuse
Line
Fuse
GS 50A/480 Vac
AC1 50/60 Hz
LoadLine
Digital output
0-20mA
4-20mA
0-10Vdc
0-5Vdc
Controller
Relay output - Alarm
(solid state relay)
Potentiometer
24Vac 1,5VA
*
AL
PWR ON
Analog
Alarm
Master
Out
Input
+10 Vdc
24 Vac
Slave
30 Vdc/ac
OutSupply
21354768
AL
ON
6√32Vcc
ON/OFF Control
CONNECTION EXAMPLES
Phase R
Three-phase star connection with neutral using one GT in Master configuration and two GSs in Slave configuration.
Phase S
Phase T
Neutral
Ground
Load
24Vac 1,5VA
Controller
Digital output
0-20mA
4-20mA
0-10Vdc
0-5Vdc
Potentiometer
TABLE OF TERMINALS AND CONDUCTORS
CONTROL TERMINAL POWER TERMINAL
Contact Type of pre- Max section. **
Size area isolated terminal conductor
(WxD) tightening
screw type torque
25/40A 6,3x9 Eye/fork / 2.5mm2
50/60A M3 tip 0.6Nm Max
75-90A 6,3x9 Eye/fork / 2.5mm2
M3 tip 0.6Nm Max
120A 6,3x9 Eye/fork / 2.5mm2
M3 tip 0.6Nm Max
L2
Load
24 Vac
876
ihL1
Line
480 V
0..10V
0..5V
4..20mA
0..20mA
GT 50A/480 Vac
AC1 50/60 Hz
PWRON
Analog
Input
+10 Vdc
OutSupply
Line
230 V
g Alarm Adj
f Input selection
e Max Adj
d Min Adj
c Reset Alarm
AL
Master
Slave
Fuse
Line
Alarm
Out
30 Vdc/ac
32154
Fuse
Line
GS 50A/480 Vac
AC1 50/60 Hz
AL
ON
6√32Vcc
ON/OFF Control
Load
Contact Type of pre- Max section. **
area isolated terminal conductor
(WxD) tightening
screw type torque
16x18 Eye/fork 50mm2
M6 3.5-6 Nm
16x18 Eye/fork 50mm2
M6 3.5-6 Nm
16x18 Eye/fork 50mm2
M6 3.5-6 Nm
Fuse
Line
GS 50A/480 Vac
AC1 50/60 Hz
AL
ON
6√32Vcc
ON/OFF Control
Load
GROUND TERMINAL •
Contact Max section. **
area conductor
(WxD) tightening
screw type torque
14x16 50mm2
M5 1.8-2.5Nm
14x16 50mm2
M5 1.8-2.5 Nm
14x16 50mm2
M5 1.8-2.5 Nm
(**) The max. sections specified refer to unipolar copper wires isolated in PVC.
• Note: For the ground terminal, you have to use an eye wire terminal.
(WxD) = Width x depth
ACCESSORIES
A wide range of accessories is available (including fuses and fuse holders, supports for fastening DIN bar, ID
plates, thermostats, current transformers and isolation transformers). To choose accessories, see the section
“Solid state relays - Accessories.”
ORDER CODE
Model
Nominal current
40Aac
50Aac
60Aac
75Aac
90Aac
120Aac
Nominal voltage
Load interrupt
(HB) option
With load
interrupt option
GT
25 25Aac
40
50
60
75
90
120
480 480Vac
0 Without option
1
GT 480
/
-
Please contact GEFRAN personnel for information on availability of codes.
•WARNINGS
WARNING: this symbol indicates danger.
Before installation, please read the following advices:
• follow the indications of the manual scrupulously when making the connections to the instrument.
• use a cable that is suitable for the ratings of voltage and current indicated in the technical specifications.
• if the instrument is used in applications where there is risk of injury to persons and damage to machines or materials, it is essential that it is used with
an auxiliary alarm device.
It is advisable to verify frequently that the alarm device is functional even during the normal operation of the equipment.
• The instrument must NOT be used in environments where there could be the presence of dangerous atmospheres (inflammable or explosive).
• During continuous operation, the heatsink may reach 100°C and remain at a high temperature due to thermal inertia even after the device is switched
off. Therefore, DO NOT touch the heat sink or the electrical wires.
• do not operate on the power circuit untless the main supply is disconnected.
• DO NOT open the cover if device is “ON”!
(use the holes in the cover for eventual re-calibration).
Installation:
• connect the device to the ground using the proper ground terminal.
• the power supply wiring must be kept separate from that of inputs and outputs of the instrument; always check that the supply voltage corresponds to
that indicated on the instrument cover.
• evitare la polvere, l’ umidità, i gas corrosivi, le fonti di calore.
• keep away from dust, humidity, corrosive gases and heat sources.
• The connection cable must be shorter than 3 meters if the current transformer is used.
Maintenance: Check the correct operation of the cooling fans at regular intervals; clean the ventilation air filters of the installation at regular intervals.
• Repairs must be performed only by specialized or appropriately trained personnel. Cut off power to the device before accessing internal parts.
• Do not clean the box with solvents derived from hydrocarbons (trichloroethylene, gasoline, etc.). Using such solvents will compromise the mechanical
reliability of the device. To clean external plastic parts, use a clean cloth wet with ethyl alcohol or water.
Technical service : GEFRAN has a technical service department. Defects caused by use not conforming to the instructions are excluded from the
warranty.
GEFRAN spa reserves the right to make any kind of design or functional modification at any moment without prior notice
This device conforms to European Union Directive 2004/108/CE and 2006/95/CE as amended with reference to generic standards:
EN 61000-6-2 (immunity in industrial environment) EN 61000-6-4 (emission in industrial environment) - EN 61010-1 (safety
regulations).
In Conformity with UL508 - File: E243386
DTS_GT_07-2015_ENG
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