Reo Elektronik REOTRON MEW User manual

REO UK LTD Publication No.: 2022_GBANL.doc
Units 8 -10 Long Lane Industrial Estate 08/99
Craven Arms, Shropshire SY7 8DU
Tel: [phone]
Fax: [phone]
http://www.reo.co.uk
eMail: mai[email protected]k
Operating Instructions
REOTRON MEW
Single Phase Power Controller
ELEKTRONIK
ELEKTRONIKELEKTRONIK
ELEKTRONIK

Operating Instructions REOTRON MEW
REO UK LTD 2
ELEKTRONIK
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Technical Safety Information for the User
This description contains the necessary information for the correct application of the product described
below. It is intended for use by technically qualified personal.
Qualified personnel are persons who, because of their training, experience and position as well as
their knowledge of appropriate standards, regulations, health and safety requirements and working
conditions, are authorised to be responsible for the safety of the equipment, at all times, whilst carrying
out their normal duties and are therefore aware of, and can report, possible hazards (Definition of
specialist according to IEC 364).
Safety Instructions
The following instructions are provided for the personal safety of operators and also for the
protection of the described product and connected equipment.
Warning!
Hazardous Voltage
Failure to observe can kill, cause serious injury or damage
•Isolate from mains before installation or dismantling work, as well as for fuse changes or post
installation modifications.
•Observe the prescribed accident prevention and safety rules for the specific application.
•Before putting into operation check if the rated voltage for the unit conforms with the local
supply voltage.
•Emergency stop devices must be provided for all applications. Operation of the emergency
stop must inhibit any further uncontrolled operation.
Prescribed Use
The units described herein are electrically powered for use in industrial applications. They are
designed for power adjustment of resistive or inductive loads.
!

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Contents Page
1.0 General 4
2.0 Function Description 4
2.1 Effective Current Value 5
2.2 Effective Voltage Value 5
2.3 Current Regulation 5
2.4 Voltage Regulation 5
2.5 Pulse Generation 5
2.6 Temperature Monitoring 5
3.0 Control Inputs and Outputs 5
3.1 Setpoint Input U 6
3.2 Setpoint Input I 6
3.3 Enable (Regulator Inhibit) 6
3.4 Actual Voltage Output (Option) 6
3.5 Actual Current Output (Option) 6
3.6 Fault Indication 6
4.0 Construction 6
5.0 Adjustment Facilities 7
6.0 Adjustment Instructions 7
7.0 Technical Data 9
8.0 Ordering Codes 10
9.0 Adjustment Components 11
10.0 Fuse Change 12
11.0 Installation Guidelines 12
12.0 Guidelines on Electromagnetic Interference 12
13.0 Connection Diagrams 13
14.0 Dimension Drawing 14
14.1 Dimension Drawing MEW 150/XXX 15

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1.0 General
The range of REOTRON MEW Thyristor Regulators are microprocessor based units for controlling
the power to resistive and inductive loads. In essence the units comprise inverse parallel connected
power semiconductors (thyristors) and the control and regulation electronics. The units have a
regulated, AC output. The inverse parallel connected thyristors operate as contact free, power
controllers using the phase angle control or the full wave principles. In the phase angle control mode
(symetrical load) the equipment can be used as a voltage or current regulator and also there is an
option for power regulation. The set point value for the current and voltage can be provided by an
external control voltage of 0-10 V, 0-20 mA, DC or a potentiometer. The lowest set point has priority.
The effective value is fed back internally from a voltage or current transformer. The maximum current
limit of the unit cannot be exceeded in all regulation modes, using phase angle control. Applications
with a wide load resistance variation Rcold/Rwarm are possible, and an overloading of the unit is
prevented.
Typical Applications
Industrial Ovens Steam Generators Lighting Installations
Infra Red Emitters (Dryers) Preheating Plants Air Conditioning Plant
Tunnel Heaters Room Heating Equipment Fan Heating Systems
Plastic Moulding Equipment Extruders
2.0 Function description
The MEW thyristor control unit was designed to operate with a
symetrical load. They include a voltage and current regulator.
In the voltage regulation mode the output voltage determined
by the set point is held constant by an internal circuit, therefore
load or mains variations have no influence on the output
voltage. The selected maximum current, however, cannot be
exceeded in this mode (current limiting). If the unit is used as a
current regulator then the output current of the unit is
compared with the setpoint and regulated accordingly. The
output voltage can increase to the selected voltage set point.
LED's illuminate if the limit Imax or adjustment limits are
exceeded.
If both set points are adjusted during operation, the regulator
always gives the lower set point priority. During voltage
regulation, with underlying current regulation, the voltage
regulation is always in operation providing the allowed current
limit is not exceeded. If the current limit is reached then the
current regulator has priority. Should the unit be used as a
pure voltage or current regulator, the other available set point
must be linked to the reference voltage (10V DC).
Actual
Current
Actual
Voltage
Current
Setpoint
Voltage
Setpoint
Enable
Fault
PULSE
GENERATION
Actual
Output
(Option)
Control
Electronics
L1 L2 (N)
F1
R
C
Mains connection
Output
I
U

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2.1 Effective Current Value
The effective current value is measured inside the unit through a current transformer and a burden
resistor. The internal microprocessor determines the effective value of the output current and adjusts
this using a PI regulator.
2.2 Effective Voltage Value
The effective voltage value is also measured internally using a voltage transformer and the effective
value is controlled by the microprocessor using a PI regulator.
2.3 Current Regulator
Microprocessor controller with PI Characteristics; the P portion is adjustable externally by using
trimmer P4. The units maximum output current (Rated Current) is factory set. If the thyristor controller
is to be adapted for a small load current, then a correction can be made by using trimmer Imax.
BEWARE: It is possible to obtain an output current which is higher than the rated current because of
component and manufacturing tolerances, however, for safety, it is essential that the current limit is
not set higher than the rated current
In current regulation mode the LED Imax is permanently illuminated.
2.4 Voltage Regulator
Microprocessor controller with PI Characteristics; the P portion is adjustable externally by using
trimmer P3. The units maximum voltage output is factory set to the rated voltage (for 100% set point).
Therefore, the setpoint cannot be fully used during voltage regulation since this would not allow for
any over voltage. In this operating mode (voltage regulation) either the setpoint must be limited or the
maximum unit output voltage must be reduced by using the trimmer Umax.
2.5 Pulse Generation
The pulses required for the control of the thyristors are generated by the microprocessor and are fed
to amplifiers prior to the pulse conductors. The secondary windings of the pulse conductors directly
control the thyristors.
2.6 Temperature Monitoring
A temperature switch is fitted into the heat sink to monitor its temperature and this switches off the
thyristor controller, permanently, if the temperature exceeds a maximum of 80oC. Fault indication is
provided by the general fault relay and displayed by the LED on the front panel.
3.0 Control Inputs and Outputs
Control Inputs
Setpoint Input U 0(4)...20 mA, 0-10V DC or Potentiometer 10kΩ
Setpoint Input I 0(4)...20 mA, 0-10V DC or Potentiometer 10kΩ
Enable 12-24V DC or contacts
Outputs:
Effective Current Value 0-10V DC corresponding to 0-100% (Option)
Effective Voltage Value 0-10V DC corresponding to 0-100% (Option)
Fault Indication Relay Contact 250V/1A (Change over)

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3.1 Setpoint Input U
The value of the output voltage is determined by the setpoint input U. The setpoint can be provided in
the form of 0-10 V, 0-20mA, DC or with a 10kΩPotentiometer. A +10V reference voltage is provided
for potentiometer operation.
With setpoint 4...20 mA, put the switch “S1/5” to “ON”.
3.2 Setpoint Input I
The strength of the output current is determined by the set point input "I". The setpoint can be provided
in the form of 0-10 V, 0-20mA, DC or with a 10k Potentiometer. A +10V reference voltage is provided
for potentiometer operation.
With setpoint 4...20 mA, put the switch “S1/5” to “ON”.
3.3 Enable (Regulator Inhibit)
A control voltage (12-24V DC) must be applied to terminals 9+ and 15-, to enable the unit, or a
connection made between terminals 9 and 10 by using a switch. A permanent link between terminals 9
and 10 is used for operation without an external enable. The firing pulses are inhibited whilst the
enable input is not closed.
3.4 Actual Voltage Output (Option)
A 0-10 V DC output signal is provided and this corresponds to the units momentary voltage output.
This generates 10V for 100% of the units possible output voltage (using the Umax set value).
3.5 Actual Current Output (Option)
A 0-10 V DC output signal is provided and this corresponds to the units momentary current output.
This generates 10V for 100% of the units possible output current (using the Imax set value).
3.6 Fault Indication
Relay changeover contacts are provided for indicating that there has been a unit fault.
The following fault conditions energise the relay and cause the unit to switch off:
Over temperature of the power unit
Mains synchronisation not possible
A fault condition must be cancelled with the RESET push button.
4.0 Construction
The thyristor regulator unit is a completely wired, function tested, compact unit. The unit is designed
for panel mounting. The connections for the mains supply and load are brought out to screw terminals
and the control signals to plug-in screw terminals. The unit front panel incorporates the adjustment
components (trimmers, switch and light diodes) to display and control the operating conditions.
The fuses for protecting the semiconductors is built into the front panel are accessed by removing the
front panel.
With power regulation here the power setpoint is determined
(
switch S1/6=ON
)
With power regulation the actual power is given
instead of the actual volta
g
e.

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5.0 Adjustment Facilities
The following parameters can be adjusted on the unit:-
Umax - Maximum Output Voltage Umin - Minimum Output Voltage
Imax - Maximum Output Current Imin - Minimum Output Current
P - Characteristic of the Voltage Regulator P - Characteristic of the Current Regulator
Ramp up time Ramp down time
The trimmers are adjustable through the front panel.
6.0 Adjustment Instructions
Preparatory Steps
Connect unit according to connection
drawing, disconnect the enable and
adjust set point to zero. The unit will
now operate with the basic factory
settings: output current = rated current,
output voltage = rated input voltage1), Umin = 0,
phase angle control, regulation mode.
The setpoint control curve can be determined by
using trimmers Umin/Umax and Imin/Imax ie the
setpoint control range. At this stage, it is also
possible, to make permanent adjustments,
without external setpoints.
The range minimum always extends from zero to
the adjusted range maximum. The maximum
value must be set first.
Adjustment of the MAX - Values
Umax
Hint: If the output voltage is to be regulated at the maximum set point, then the maximum output
voltage must be limited at a value which reduces the regulation range.
Switch on the mains voltage and enable the unit. Set the current set point to maximum. Now increase
the voltage set point until the required output voltage level is reached (observe current limit indicator).
If the set point source is not yet at maximum, then the output voltage must be reduced again by using
trimmer Umax and then the voltage set point can be further increased until the maximum value of the
voltage set point is achieved. If there is no risk of damaging the load with an over voltage then the
output voltage can be set by using trimmer Umax with the set point turned fully up. Anticlockwise
adjustment increases the output voltage.
Imax
Remove the unit enable. Adjust voltage set point to maximum and current setpoint to zero. Turn
trimmer Imax fully clockwise (10 turn pot). Next enable the unit and adjust the current setpoint to
maximum. Set the maximum current value by turning trimmer Imax anti-clockwise.

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Adjustment of the MIN - Values:
Umin
Trimmers P1 and P2 are used to adjust the MIN value, however these trimmers are used for various
other functions. Below is the recommended adjustment procedure.
Set rotary switch 'S2' on the front panel to position '1' and press the RESET button. Next
adjust the trimmers P1 (coarse) and P2 (fine) to the required minimum voltage and
afterwards press the SETUP button. To return to normal operation put the rotary switch
'S2' back to '0' and press the RESET button.
Imin
This adjustment is only meaningful for pure current control, if a current free condition of the load is to
be avoided.
This adjustment is also carried out by using trimmers P1 and P2. Set rotary switch 'S2' on the front
panel to position '2' and press the RESET button. Next adjust the trimmers P1 (coarse)
and P2 (fine) to the required minimum current and afterwards press the SETUP button.
To return to normal operation put the rotary switch 'S2' back to '0' and press the RESET
button.
Ramp up /down times
The ramp up time for when the unit is switched on, using the enable input (set point 100%) or when
the set point suddenly rises, giving 0 to 100% of the maximum output value, and also the run down
time to reach an output value for a set point change in the direction of zero.
This adjustment is similarly achieved using the trimmer P1 for Ramp up and P2 for Ramp down times.
With the voltage set point at zero and the current set point at maximum.
Set rotary switch 'S2' on the front panel to position '3' and press the RESET button. Next set the
required ramp time (0.1-10s) using trimmer P1 and test for a set point change from
zero to 100%; afterwards set the ramp down time with trimmer P2 and again test by
changing the set point. When the required values have been chosen, once again press
the "SETUP" button, return rotary switch 'S2' back to '0' and press the RESET button.
Proportional Characteristic Voltage Regulation
The speed of regulation (sensitivity) of the voltage regulator. Adjust, using the actual load, using
trimmer P3.
Proportional Characteristic Current Regulation
The speed of regulation (sensitivity) of the current regulator. Adjust, using the actual load, using
trimmer P4.
Hint
To return the unit to the factory settings, the procedure is as follows:-
Rotate selector switch "S2" to position "F" and press the RESET button. Afterwards press the SETUP
button and return selector switch "S2" to position "0" and press the RESET button once more. The
factory settings are now reinstated.
Selector Switch S1 (Operating Mode)
S1/1 OFF = Phase angle control ON = Full wave control
S1/2 not active
S1/3 not active
S1/4 not active
S1/5 OFF = 0...20 mA ON = 4...20 mA (Setpoint)
S1/6 OFF = U/I - Regulation ON = Power Regulation
S1/7 OFF = Without data interface ON = with data interface
S1/8 OFF = Reserved
The RESET button must be pressed before a change of the switch settings.
ON
OFF
1
2
3
4
5
6
7
8

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7.0 Technical Data
TYPE Rated Voltage Output Voltage2) Output Current
50/60Hz MAX.
MEW 10/230 230 V +6% -10% 0-230 V 10 A
MEW 10/400 400 V +6% -10% 0-400 V 10 A
MEW 20/230 230 V +6% -10% 0-230 V 20 A
MEW 20/400 400 V +6% -10% 0-400 V 20 A
MEW 50/230 230 V +6% -10% 0-230 V 50 A
MEW 50/400 400 V +6% -10% 0-400 V 50 A
MEW 80/230 230 V +6% -10% 0-230 V 80 A
MEW 80/400 400 V +6% -10% 0-400 V 80 A
MEW 110/230 230 V +6% -10% 0-230 V 110 A
MEW 110/400 400 V +6% -10% 0-400 V 110 A
MEW 150/400 400 V +6% -10% 0-400 V 150 A
Load Types resistive / resistive - inductive; for transformers max. induction 1,45 Tesla
Setpoint source 5 / 10 kΩPotentiometer
0-10V, DC
0-20 mA
Ramp up/down time 0,1 - 10 sec.
Enable Switch 12-24 V, DC
Actual value output I 0-10 V, DC
Actual value output U 0-10 V, DC
Fault relay 1 change over contacts 250 V, 1 A
Ambient temp. 0-45 °C
Dimensions approx. (HxBxD)
MEW 10/XXX MEW 20/XXX MEW 50/XXX MEW 80/XXX MEW110/XXX MEW150/XXX
290x70x205 290x110x205 290x110x205 320x150x205 320x180x205 320x180x205
2) The output voltage is subject to a voltage loss across the semiconductors.

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8.0 Ordering Codes
Type ID-Number Description
REOTRON MEW 10/230 6311 10 A/230 V Standard unit
REOTRON MEW 10/400 6312 10 A/400 V Standard unit
REOTRON MEW 10/230 DA 6316 10 A/400 V with D/A-Module
REOTRON MEW 10/400 DA 6317 10 A/400 V with D/A-Module
REOTRON MEW 10/230 RS 6315 10 A/400 V with RS 232 Interface
REOTRON MEW 10/400 RS 6318 10 A/400 V with RS 232 Interface
REOTRON MEW 10/230 IS 6313 10 A/400 V with INTERBUS-S Interface
REOTRON MEW 10/400 IS 6314 10 A/400 V with INTERBUS-S Interface
REOTRON MEW 20/230 6321 20 A/230 V Standard unit
REOTRON MEW 20/400 6322 20 A/400 V Standard unit
REOTRON MEW 20/230 DA 6328 20 A/230 V with D/A-Module
REOTRON MEW 20/400 DA 6327 20 A/400 V with D/A-Module
REOTRON MEW 20/230 RS 6329 20 A/230 V with RS 232 Interface
REOTRON MEW 20/400 RS 63210 20 A/400 V with RS 232 Interface
REOTRON MEW 20/230 IS 6324 20 A/230 V with INTERBUS-S Interface
REOTRON MEW 20/400 IS 6325 20 A/400V with INTERBUS-S Interface
REOTRON MEW 50/230 6331 50 A/230 V Standard unit
REOTRON MEW 50/400 6332 50 A/400 V Standard unit
REOTRON MEW 50/230 DA 6338 50 A/230 V with D/A-Module
REOTRON MEW 50/400 DA 6337 50 A/400 V with D/A-Module
REOTRON MEW 50/230 RS 6339 50 A/230 V with RS 232 Interface
REOTRON MEW 50/400 RS 63310 50 A/400 V with RS 232 Interface
REOTRON MEW 50/230 IS 6333 50 A/400 V with INTERBUS-S Interface
REOTRON MEW 50/400 IS 6334 50 A/400 V with INTERBUS-S Interface
REOTRON MEW 80/230 6341 80 A/230 V Standard unit
REOTRON MEW 80/400 6342 80 A/400 V Standard unit
REOTRON MEW 80/230 DA 6348 80 A/230 V with D/A-Module
REOTRON MEW 80/400 DA 6347 80 A/400 V with D/A-Module
REOTRON MEW 80/230 RS 63410 80 A/400 V with RS 232 Interface
REOTRON MEW 80/400 RS 6349 80 A/400 V with RS 232 Interface
REOTRON MEW 80/230 IS 6343 80 A/400 V with INTERBUS-S Interface
REOTRON MEW 80/400 IS 6344 80 A/400 V with INTERBUS-S Interface
REOTRON MEW 110/230 6351 110 A/230 V Standard unit
REOTRON MEW 110/400 6352 110 A/400 V Standard unit
REOTRON MEW 110/230 DA 6358 110 A/400 V with D/A-Module
REOTRON MEW 110/400 DA 6357 110 A/400 V with D/A-Module
REOTRON MEW 110/230 RS 6355 110 A/400 V with RS 232 Interface
REOTRON MEW 110/400 RS 6356 110 A/400 V with RS 232 Interface
REOTRON MEW 110/230 IS 6353 110 A/400 V with INTERBUS-S Interface
REOTRON MEW 110/400 IS 6354 110 A/400 V with INTERBUS-S Interface
REOTRON MEW 150/400 DA 2057 150 A/400 V with D/A-Module

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9.0 Adjustment Components
LED Indicator Functions
ERROR System fault
TEMP Over temperature
SYNC Mains synchronisation fault
I-Max Current limit reached ie current regulator active
LOAD Impedance fault / peak current reached
MAX Max. adjustment limit reached
INIT Initialisation phase
READY Ready to operate
ENABLE Enable
IN1 External Input 1 (Reserved)
IN2 External Input 2 (Reserved)
S2 S2 = 1 S2 = 2 S2=3
P1 =Umin/coarse
P2 = Umin/fine
Imin/coarse
Imin/fine
Ramp up
Ramp down
times
P3 = P-Characteristic voltage regulator
P4 = P-Characteristic current regualtor
Selector Switch S1
S1/1 - OFF = Phase angle control ON = Full wave control
S1/2 -
S1/3 - Reserved for curent controller
S1/4 -
S1/5 – OFF = 0...20 mA ON = 4...20 mA (Setpoint)
S1/6 - OFF = I/U-Regulation ON = Power regulation
S1/7 - OFF = without data interface ON = with data interface
S1/8 - OFF = Reserved
Selector Switch S2
0 = Normal operation (Regulator)
1 = Adjustment Umin
2 = Adjustment Imin
3 = Adjustment ramp up/down times
4 = Reserved
5 = Uncontrolled operation (no regulation / no current limiting)
6-E = Reserved
F = Reinstate factory settings
RESET = System reset-Button
SETUP = Enter new parameters
ONOFF
1
2
3
4
5
6
7
8
ERROR
ENABLE
TEMP
SYNC
I-max
LOAD
MAX
INIT
READY
IN1
IN2
P1
P2
P3
P4
S1
U-max
I-max
S2
RESET
SETUP
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
REOTRON
MEW
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10.0 Fuse change
Switch unit off before changing fuse!
The semiconductor fuse can be found in the left hand section of the front panel. To change the fuse
the two screws marked "x" must be loosened. The cover can then be removed by sliding it to the right.
For MEW/xxx type units the fuse can be found in the front panel.
Fuse Types:
MEW 10/xxx FF 16
MEW 20/xxx ET 35
MEW 50/xxx ET 80
MEW 80/xxx EET 140
MEW 110/xxx EET 160
MEW 150/xxx 6.6 URB 000 BS88/250
When ordering spare fuses use capital letters for fuse types.
11.0 Installation Guidelines
The unit is designed for panel mounting. It should be installed vertically with the terminals at
the bottom. Ensure that there is sufficient air space in unventilated cabinets.
The units can be placed side by side with a minimum clearance of 30mm. If the units are
mounted one over the other, then there must be a clearance of approximately 250mm.
The control cables should be shielded and the shield should be connected to earth.
12.0 Guidelines on Electromagnetic Interference
INTERBUS-S is a serial data transfer system which was conceived for applications in an industrial
environment. When correctly installed, INTERBUS-S complies with all the requirements specified in
the standard IEC 801 for data transfer systems in a harsh industrial environment. When the interface
module is used in an electromagnetic, interference prone, area, then the possible sources of
interference should be suppressed.
Interference can be due, in particular, to:
•Protection devices
•Switching of inductive loads
•Solenoid valves
RC networks and varistors suppress interference. Manufacturers supply correctly sized components
for suppressing solenoid coils.
Electrical spikes, which can affect bus cables in an industrial environment, can be suppressed by a
correctly fitted screen. The following measures provide the best screening results:
•Cover fixing screws of bus cable plugs and conductors at equal potentials.
•Only use connectors with a metal or metalised housing.
•Spread out the screen in connectors.
!

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13.0 Connection Diagrams
Control Terminals
Power terminals
Potentiometer setpoint source Setpoint source using
0-10 V, DC control voltage
Setpoint source using
0-20 mA control current
L1 L2 PE PE V U(N)(L) (N) (U)
230V, 50/60Hz
400V, 50/60Hz
Load
NC C NO
00++
0 - 10V 0 - 10V
Actual value
Voltage Actual value Current
11 12 13 14 15 16 17 18 19 20
(Optional)
21 22 23 24 25 26
L1 (L)
L2 (N)
PE
00
+10V +10V
1 2 34 5 6 7 8 910
10k 10k
Voltage setpoint Current setpoint Enable
12 345678910
00+++
Setpoint Voltage Setpoint Current
0 - 20mA 0 - 20mA Enable
24V, DC
(to terminal 15)
12 345678910
Enable
00++
Setpoint Voltage Setpoint Current
0 - 10V, DC 0 - 10V, DC
(Power setpoint) (Setpoint power)
(Power setpoint) (Actual value power)

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14.0 Dimensions
ab
c
ONOFF
1
2
3
4
5
6
7
8
ERROR
ENABLE
TEMP
SYNC
I-max
LOAD
MAX
INIT
READY
IN1
IN2
P1
P2
P3
P4
S1
U-max
I-max
S2
RESET
SETUP
0
1
2
3
4 5
6
7
8
9
A
B
C
D
E
F
e
REOTRON
MEW
d
x
205
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Dimension MEW10 MEW20 MEW50 MEW80 MEW110
a - 70 70 60 90
b 35 15 15 30 30
c 70 110 110 150 180
d 290 290 290 320 320
e 280 280 280 304 304
x - 5 5 5 10

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14.1 Dimensions MEW 150/XXX
ONOFF
1
2
3
4
5
6
7
8
ERROR
ENABLE
TEMP
SYNC
I-max
LOAD
MAX
INIT
READY
IN1
IN2
P1
P2
P3
P4
S1
U-max
I-max
S2
RESET
SETUP
REOTRON
MEW
FOR CONTINUED FIRE
PROTECTION REPLACE
ONLY WITH SPECIFIED
TYPE AND RATED FUSE
DISCONNECT POWER
INPUT BEFORE
REPLACINGFUSE
320
290
90
180
1
4
7
8
F
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11 12 13 14 15 16 17 18 19 20
12 345678910
1
2
3
4
5
6
21
22
26
25
23 24
7
8
1 Control terminals
2 Power terminal Input L1
3 Power terminal Input L2 (N)
4 Power terminal Output V (N)
5 Power terminal Output U (U)
6 PE
7 PE
8 Plexiglass cover