Eurotherm 7000 Series User manual

Single Phase
Power
Thyristor
Units
User
Manual
ε
7300A
ENG

i
7300AADVANCED CONTROLLERS
THREE-PHASE
POWER THYRISTOR UNITS
7000*series
User
Manual
© Copyright Eurotherm Limited 2002
All rights reserved. All reproduction or transmission in any form whatsoever and using any procedure
(electronic or mechanical, including photocopying and recording) without written permission from
Eurotherm is strictly prohibited.
Ref.: HA 176659 ENG - Issue 2.1 - 12/2005

7300A User Manual
ii
Check characteristics
Wiring
Auxiliary power supply
Power control (VICL code):
Calibrate Imax and Pmax while not firing
for given load
Control and limit in I2, V2CL :
Calibrate minimum current
Apply control signal
Power up
Check firing
Ad ust
ICO calibrations and threshold
while firing at full conduction
Optimise firing delay
for inductive load
Ad ust DLF alarm
(if conditions met)
Normal operation
CHK/SET push button
Characteristics correspond
to product code Chapter 1
Supply protection,
protective earth,
power, control
Chapter 2
If external supply
(electronics or fan) Page 2-11
Pages 4-4
Page 2-10
Chapter 2
Chapter 3
Pages 4-3 to 4-5,
5-7
Chapter 4
Page 3-3
Alarms signalled Chapter 5
Page 5-5 to 5-7
I lim potentiometer
I lim,VI lim potentiometers
Control signal:
"HRC" terminal
GRF, DLF, ICO LEDs
I lim potentiometer
DLY potentiometer
(XFMR code)
"ANA" terminal block
Chapter 3
ICO option (Over-current alarm):
Calibrate maximum current
ON, HEAT LEDs
COMMISSIONING FLOWCHART
Note: If the code does not correspond, go to the next step.

7300A User Manual iii
Contents
CONTENTS
Page
Commissioning flowchart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .ii
European Directives and applicable standards . . . . . . . . . . . . . . . .iv
Cha ter 1 Identification of power thyristor units . . . . . . . . . .1-1
Cha ter 2 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1
Cha ter 3 Firing modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1
Cha ter 4 Control and Limits . . . . . . . . . . . . . . . . . . . . . . . . .4-1
Cha ter 5 Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1
Cha ter 6 Digital Communication . . . . . . . . . . . . . . . . . . . . .6-1
Cha ter 7 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-1
Eurotherm worldwide sales and service . . . . . . . . . . . . . . . . . . .8-1
PURPOSE OF MANUAL
This manual (Issue 2.1) describes the Basic Version and all options for 7300A series
three-phase power thyristor units with current ratings up to 160 A.

7300A User Manual
iv
European directives and applicable standards
EUROPEAN DIRECTIVES AND APPLICABLE STANDARDS
COMPLIANCE WITH PRODUCT STANDARD
7300A products comply with the terms of product standard EN 60947-4-3 ‘Contactors and
motor-starters - AC semiconductor motor controllers and contactors for non-motor loads’.
CE LABELLING
7300A products installed and used in accordance with the user manual, bear CE labelling on
the basis of compliance with the essential requirements of the European Low Voltage
Directive 73/23 EEC dated 19 February 1973, modified by 93/68/EEC dated 22 July 1993 and
the Electromagnetic Compatibility Directive 89/336/EEC dated 3 May 1989 modified by
92/31/EEC dated 28 April 1992 and 93/68/EEC dated 22 July 1993.
SAFETY
The units have IP20 protection rating as defined by standard IEC 60529.
External wiring must comply with standards IEC 60364-4-43 and IEC 60943.
Copper cables and conductors must be used, rated to a temperature of 75°C (167°F).
ELECTROMAGNETIC COMPATIBILITY (EMC)
7300A products installed and used in accordance with the user manual, are designed for an
industrial environment and must not be used in the home.
EMC TEST STANDARDS
IMMUNITY - The EMC immunity test standards required by the standard EN 60947-4-3
‘Contactors and motor-starters - AC semiconductor motor controllers and contactors for non-
motor loads’ are presented below.
EMC GUIDE
To help you deal with installation-dependent electromagnetic interference effects,
Eurotherm provides an ‘Electromagnetic compatibility’ installation guide
(ref. HA 025464 ENG) which sets out best current practice regarding EMC.
DECLARATION OF CONFORMITY CE is available on request.
EMISSIONS - The EMC emissions test standards required by the standard EN 60947-4-3
‘Contactors and motor-starters - AC semiconductor motor controllers and contactors for non-
motor loads’ are presented below.
Emission ty e Firing mode Test standard
Radiated at radio frequencies All firing CISPR 11 Class A modes
Conducted at radio frequencies Burst mode’ and CISPR 11 Class A Group 2 Class A 2
‘S ingle-cycle’‘Phase angle’ CISPR 11Product compliant if external filter fitted
Test ty e Standard Behaviour criterion
Electrostatic discharge EN 61000-4-2 2
Radiated, radio frequency
electromagnetic field EN 61000-4-3 1
Electrical fast transient / burst EN 61000-4-4 2
Surge EN 61000-4-5 2
Conducted disturbances induced by
radio frequency fields EN 61000-4-6 1
Voltage dips, short interruptions
and voltage variation EN 61000-4-11 2

1-1
Identification
7300A User Manual
Chapter 1
IDENTIFICATION OF POWER THYRISTOR UNITS
Contents Page
1.1. General presentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2
1.2. Technical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5
1.2.1. Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5
1.2.2. Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5
1.2.3. Load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5
1.2.4. Signalling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5
1.2.5. Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5
1.2.6. Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-6
1.2.7. Firing Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-6
1.2.8. Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-6
1.2.9. Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-7
1.2.10. Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-8
1.2.11. Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-8
1.2.12. Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-8
1.2.13. Digital Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-9
1.3. Coding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-10

Identification
7300A User Manual
1-2
Chapter 1 IDENTIFICATION
1.1. GENERAL PRESENTATION
7300A series power thyristor units are used to control the electrical power of three-phase
industrial loads of all types.
The load controlled may comprise high or low temperature coefficient resistive loads, short
wave infrared elements or transformer primaries.
Current ratings vary from 16 A to 160 A (per phase), at line-to-line voltages of 200 V to 500 V.
A 7300A series thyristor unit comprises three channels, controlled by thyristors.
Figure 1-1 General view of 7300A power thyristor unit from 16 to 40 A
GRF
DLF CHK
A
ON
HEAT
SET
I
LIM
+
ALR
71 1a
72 1b
AUX1
16 230
17
18 0V
7300
A
EUROTHERM
PE
3/L2
4/T22/T1
1/L1
ε
5/L3
6/T3
Protective arth
Terminal
Power Terminals
(supply side)
Power Terminals (load size)
Internal
power wiring
diagram
Control Terminal
Pinouts
lectonics
Power Supply
Firing request L D
DLF Option:
Diagnostic Alarm
40A / 500V
EN 60947-4-3
VI
LIM
+
70°
DLY
Control
Connector
Current Limitation
Option
DLF Option:
Push button
Diagnostic Diagram
VICL Option:
Power Control
XFMR Option :
Firing Delay
ADJ.C
AL
66 0VC
67 HRC
Current
Limitation
Option
GRF Option:
Serious Alarm
I
LIM
Communication Option :
Transmission LEDs and
configuration microswitch
ON/
Dxch
Rx
Tx
ON
COM
B A
91 92
Aux2
GND 24V 0VS
15 19 20

7300A User Manual 1-3
Identification
Figure 1-2 General view of 7300A unit from 63 A to 100 A
7300A
EUROTHERM
PE
3/L2
4/T22/T1
1/L1
ε
5/L3
6/T3
63A / 500 V
EN 60947-4-3
Protective arth
Terminal
Power Terminals
(Supply side)
Power Terminals
(Load side)
Internal
power wiring
diagram
Control Terminal
Pinouts
GRF Option:
Serious Alarm
Firing Request
DLF Option:
Diagnostic alarm
Control Connector
GRF
DLF CHK
A
ON
HEAT
SET
I
LIM
+
ALR
71 1a
72 1b
AUX1
16 230
17
18 0V
VI
LIM
+
70°
DLY
ADJ.C
AL
66 0VC
67 HRC
I
LIM
ON/
Dxch
Rx
Tx
ON
COM
B A
91 92
Aux2
GND 24V 0VS
15 19 20

Identification
7300A User Manual
1-4
Figure 1-3 General view of 7300A units ≥ 125 A
EUROTHERM
ε
7300A
125 A / 500 V
GRF
DLF
ON
HEAT
CHK
SET
EN 60947-4-3
1/L1
2/T1
LDC
0VL LD
11 12
ALR
1a 1b
73 74
T°
FAN
230 N
16 17 18
EXT
L2
21 22
3/L2
4/T2
1/L1
Internal wiring diagram
(internal fuse for
125 to 200 A ratings)
Power
Terminals
(Supply side)
Internal fuse
Compartment Protective earth
terminal
DLF Option-
CHK/SET
Push-Button :
DLF alarm
setting / diagnosis
Fuse blown
contact
(MSFU code)
Power terminals
(load side)
Fan
Over-temperature
Alarm (≥ 125 A only)
2 attachement screws
for internal fuse
compartment
2/T1
Fixing plate
MSF
3a 3b
75 76
3/L2 4/L3
4/T2
6/T3
4/L3
6/T3
Control terminals

7300A User Manual 1-5
Identification
1.2. TECHNICAL SPECIFICATIONS
1.2.1. Use Thyristor unit, variant 4 (see Standard EN 60947-4-3)
for uninterrupted service.
1.2.2. Power
Nominal current per phase 16 A to 160 A at 45°C ( see product code)
Nominal line to line voltage 200 V to 500 V (see code).
Frequency Use from 47 to 63 Hz (automatic matching)
Dissipated power 1.3 W (approx.) per amp and per phase
Cooling ratings ≤100 A: Natural convection
ratings ≥125 A: Fan-cooled.
1.2. . Load Three-phase Industrial Load.
Categories of use The categories of use applicable for each unit are indicated
on the identification label
• AC-51 Non-inductive or low inductance loads, furnace
resistances
(Resistive load with low temperature coefficient).
•
AC-55b Switching of incandescent lamps, for units ≤100 A
(Short wave infrared elements, SWIR).
• AC-56a Switching of transformers
(Transformer primaries and high temperature
coefficient resistive loads).
Options must be fitted to 7300A units in order to comply
with certain categories of use.
Connections Independent of phase rotation order
Load configuration Star with or without neutral, open or closed delta.
Configuration on order.
1.2.4. Signalling Electronics supply present (green ‘ON’ LED) and supply
fault detection (‘ON’ LED flashing).
Thyristor firing request : (green ‘HEAT’ LED).
1.2.5. Dimensions
Rating Height Width Depth (mm)
Base One Option Option +
only or Comms
Comms only
16 A à 40 A 220 mm 96 mm 164 189 239
63 A à 100 A 305 mm 144 mm 295 295 372
125 A à 160 A 498 mm 144 mm 295 295 372

Identification
7300A User Manual
1-6
1.2.6. Command
Supply Self-powered from line or external power supply
(115 V or 230 V +10%; -15%) depending on order code.
Consumption: 10 VA.
Control type Analogue (digital communication optional)
• either remote analogue setpoint:
0-5 V or 0-10 V (100 kΩinput),
0-20 mA or 4-20 mA (250 Ωinput)
•
or manual setpoint (potentiometer):
5 V user voltage output available (max. 2 mA).
1.2.7. Firing modes
Zero crossing firing • Burst mode, base time: 16 or 64 cycles
• Single-cycle, 1 base cycle
• Advanced single-cycle, 1 base cycle
firing by whole cycles,
non-firing by half cycles;
(not available for 3S and 3D three-phase load
configuration)
Firing angle variation • Phase angle
1.2.8. Control
Control parameter • Standard (on balanced three-phase supply):
Load voltage squared (V2)
• Option:
- Apparent power (V . I)
with mean of 3 phase currents
- Mean of square of 3 load currents (I2) in
Phase angle mode
- Open loop in Phase angle mode.
Linearity and Stability Better than ±2% of full scale.
Current limit Option, depending on firing mode:
• Phase angle:
Automatic control transfer:
V2<-> I2, or V .I <-> I2,
Current recalibration set by potentiometer on front panel.
• Burst mode, 16 cycle base:
Current limit with threshold, set by potentiometer on
front panel.
Safety ramp After each power up or after stopping firing for 5 s or more
(Burst mode firing with Phase angle limiting).
Calibration A control signal is available in V .I control for power and
current calibration and for maintenance.
Transient current limit
Option to control transformer primaries
in Burst mode:
•
Magnetisation ramp in phase angle variation on first
power up.
• Adjustable delay for first firing.

7300A User Manual 1-7
Identification
1.2.9. ALARMS
Standard alarms
Supply fault Supply voltage absent on one or three phases.
Frequency outside operating frequency.
Operation Cut off.
Signalling Without options: ‘ON’ LED
With alarm option: ‘ON’ LED and alarm relay.
Open circuit Neutral In ‘Star with neutral’ coupling and for DLF option
and/or power control.
Operation Cut off.
Signalling
VII2 and VICL options: ‘ON’ and ‘GRF’ LEDs.
DLF option : ‘ON ’ and ‘ GRF’ LEDs, alarm relay .
Over-temperature alarm
For all fan-cooled units ≥125 A, the unit cuts out if the
temperature threshold is exceeded.
Signalling Red ‘T°’ LED if one of the monitoring alarms is selected.
Alarm relay contact with any alarm.
Load monitoring alarms (Options)
Serious alarms (GRF option) Total load failure and thyristor short circuit detection.
Signalling Red ‘GRF’ LED and alarm relay contact
Diagnostic alarm (DLF option)
Partial load failure detection.
Signalling Orange ‘DLF’ LED and alarm relay contact.
Settings Monitoring diagnosis, alarm adjustment and resetting
using push button on front panel.
Sensitivity Detects the failure of at least one heating element
for
three or four identical elements, connected in parallel,
depending on the configuration
Extension The DLF option includes Serious alarm monitoring
(GRF).
Over Load alarm (Option)
Operation (ICO option) Cut-out if current threshold exceeded
Only available for
Zero crossing firing with DLF option
(not compatible with Short wave infrared elements,
Transformers and VICL and V2CL options).
Two alarm thresholds:
instantaneous current and rms current.
Simultaneous current threshold adjustment
(recalibration of thyristor unit):
from 20 to 100% using potentiometer on front panel.
Signalling Red ‘ICO’ LED and
alarm relay contact.
Acknowledged by logic input.
Alarm relay Available with load monitoring and over load alarm.
The relay contact (0.25 A/230 Vac; 32 Vdc) is either open
on alarm or closed on alarm depending on the product code.

Identification
7300A User Manual
1-8
1.2.10. Protection
Co-ordination type For short circuits. Load monitoring.
Electrical protection IP20 without adding additional protection.
Thyristors Varistor and RC snubber.
High speed fuses:
• rating ≤100 A: external (see code, section 6)
• rating ≥125 A: internal (under development).
No fuses for Short wave infrared elements
in Burst mode and Single-cycle firing, or
Phase angle without Current limit.
Fuse characteristics See section 7.
1.2.11. Mounting
Mounting Attachment plate fixed to unit:
• on symmetrical EN50022 DIN rail or
• bulkhead mounting
(for ratings ≥63 A: bulkhead mounting only).
1.2.12. Environment
Use 0 to 45°C at nominal current, max altitude 1000 m
Storage -10°C to 70°C.
Isolation voltage Assigned isolation voltage Vi = 500 V.
Pollution
Degree 2 acceptable (defined by IEC 60664).
Humidity RH 5% to 95%, non-condensing, non-streaming.
Over-voltage Over-voltage category II
(as defined by IEC 60664)

7300A User Manual 1-9
Identification
1.2.1 . DIGITAL COMMUNICATION
Protocol Modbus® RTU
Compliance Communication complies with the specifications given in
‘GOULD MODICON Protocol Reference Guide PI-MBUS-300 rev J’
Power supply 24 Vac (±20%), 47 to 63 Hz to
24 Vdc (±20%) non-polarised (filtered).
Typical consumption 1.5 VA.
Protection : External fuse 1 A.
External wiring must comply with the IEC 60364 standard.
Transmission Standard RS485 2 wires.
Speed 9600 to 19200 bauds.
Selection by the front panel microswitch (SW8).
Terminaison The communication bus must have termination resistors
fitted at each end:
•One line impedance matching resistor.
• two RS485 bus polarisation resistors.
Address Selection by switches on front panel only, between 1 to 127.
Physical address 32 is configured by default.
Diagnostics • Green LED an front panel indicates that power is applied
and the unit is awaiting communications.
• Two orange LEDs (Rx and Tx) indicate the communication
satus (sending and receiving)
Other parameters Read and Write by digital communication.

Identification
7300A User Manual
1-10
5.Load configuration Code
Star without Neutral 3S
Star with Neutral 4S
Closed delta 3D
Open delta 6D
2. Nominal line to line voltage Code
200 volts 200V
220 volts 220V
230 volts 230V
240 volts 240V
277 volts 277V
380 volts 380V
400 volts 400V
415 volts 415V
440 volts 440V
460 volts 460V
480 volts 480V
500 volts 500V
Ratings
6. Thyristor fuse Code
Fuse without fuse blown microswitch FUSE
Fuse with fuse blown microswitch MSFU
No fuse
Short wave infrared elements
(Burst mode or single-cycle
or Phase angle without limit
) NONE
3. Power supply for electronics Code
Self-powered SELF
External 115 V supply 115V
External 230 V supply 230V
9. Manual language Code
French FRA
English ENG
German GER
4. Fan power supply Code
≤100 A : No fan XXXX
≥125 A: - 115 V fan and 115 V 115V
- 230 V fan and 230 V 230V
10. Selected options Code
Base version: No options,
Standard V2control
End of code NONE
Version with options:
Selection of options YES
Basic selection
7. Firing mode Code
Phase angle PA
Burst mode:
base time 16 cycles C16
base time 64 cycles C64
‘Single-cycle’: 1 base cycle FC1
Advanced single-cycle: 1 base cycle
non-firing by half cycles
4S and 6D coupling only ASC
8. Input Code
Analogue signal:
current from 0 mA to 20 mA 0mA20
current from 4 mA to 20 mA 4mA20
voltage from 0 V to 5 V 0V5
voltage from 0 V to 10 V 0V10
1. Nominal current per phase Code
16 amps 16A
25 amps 25A
40 amps 40A
63 amps 63A
80 amps 80A
100 amps 100A
125 amps 125A
160 amps 160A
1. . CODING

7300A User Manual 1-11
Identification
14. Load type Code
With DLF option: Short wave infrared SWIR
Low temperature coefficient load LTCL
Without DLF option or
High temperature coefficient load XXXX
Communication and Certification
Options
11. Control options Code
Voltage control V2
PA only :
Current control I2
Open loop OL
PA or C16 :
Voltage control and Current Limitation V2CL
Power control and Current Limitation VICL
15. Over Load Alarm (with DLF option) Code
Alarm, in burst firing mode only
except codes
SWIR, XFMR, VICL ,V2CL and PA ICO
No over-current alarm XXXX
16. Alarm relay contact Code
With alarm option:
Contact closed on alarm NC
Contact open on alarm NO
Without alarm option XX
12. Delay on first firing Code
Burst firing C16 or C64:
Transformer primary XFMR
Other configurations XXXX
13. Load Monitoring Code
Serious Alarms:
Thyristor short-circuit,
Total Load failure,
over-temperature for ratings ≥125 A GRF
Partial load failure and
Serious alarms DLF
No alarms NONE
17. Communication Code
Digital Communication
ModBus Protocol MOP
Without Communication NONE
19. Certification option Code
No certificate of ‘Compliance with Order’ NONE
Certificate of ‘Compliance with Order’ CFMC
18. Transmission speed Code
Without communication XXXX
Code MOP : transmission speed
9,6 KBauds 9K6
19,2 KBauds 19K2
20. Warranty extension Code
Without warranty extension NONE
Warranty extended to 5 years WL005

Identification
7300A User Manual
1-12

7300A user Manual 2-1
Installation
Chapter 2
INSTALLATION
Contents Page
2.1. Safety during installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2
2.2. Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-3
2.2.1. Types of mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-3
2.2.2. Attachment plates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-3
2.2.3. Mounting on DIN rails . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-3
2.2.4.Bulkhead mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-4
2.3. Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-5
2.4. Power connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-7
2.4.1. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-7
2.4.2. Power connection details . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-7
2.4.3. Three-phase load configuration diagram . . . . . . . . . . . . . .2-7
2.5. Control connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-9
2.5.1. Control terminal blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-9
2.5.2. Control signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-10
2.5.3. Connecting the reference neutral voltage . . . . . . . . . . . . .2-10
2.5.4. External power supply terminal block . . . . . . . . . . . . . . . .2-11
2.5.5. Alarm relay contact . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-12
2.5.6. Acknowledgement signal . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-13
2.6. Communication bus connection . . . . . . . . . . . . . . . . . . . . . . . . . . .2-14
2.6.1. Polarity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-14
2.6.2. Wires screening . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-14
2.6.3. Termination resistors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-14
2.6.4. Power supply connection ‘AUX2’ . . . . . . . . . . . . . . . . . . . . . .2-14
2.6.5. Digital communication wiring . . . . . . . . . . . . . . . . . . . . . . .2-15

Installation
7300A user Manual
2-2
Chapter 2 INSTALLATION
2.1. SAFETY DURING INSTALLATION (MOUNTING AND WIRING)
Danger
• 7300A power thyristor units must be installed and wired by qualified staff
authorised to work on low voltage industrial electrical facilities.
• Units must be installed in a fan-cooled cabinet, to ensure that condensation and
pollution are excluded, with a class of at least 2 according to IEC 60664.
We recommend fitting fan-cooled cabinets with a fan failure detection device or
a thermal safety cut-out.
The cabinet must be closed and connected to the protective earth according to
IEC 60364 or applicable national standards.
Important
• Units must be mounted with the heatsink positioned vertically, and with no
obstructions above or below the unit which could reduce or hamper air flow.
If several units are fitted in the same cabinet, arrange them such that air from one
unit is not drawn in by the unit above.
The ambient temperature beneath the unit must not exceed 45°C.
Leave a gap of at least 10 mm between adjacent units.
Important
• Nominal currents correspond to use at ambient temperatures of no more than
45°C.
Overheating may cause incorrect operation and may even lead to
components being damaged.
Danger
• It is the user’s responsibility to wire and protect the facility according to best
practice and applicable standards.
A suitable device, ensuring that the unit can be electrically isolated from the
supply, must be installed upline to enable work to be performed safely.
Conductor cross-sections should comply with IEC 60943.
Only use copper cables and wires rated for use at 75 °C.
• Before connecting or disconnecting the unit check that power and control cables
and leads are isolated from voltage sources.
The protective earth must be connected before any other connections are made
and should be the last cable to be disconnected.
The protective earth connection terminal is marked with the symbol:
Important
• To ensure that 7300A power thyristor units comply with Electromagnetic
Compatibility requirements, ensure that the panel or DIN rail to which they are
attached is correctly grounded.
The ground connection, designed to ensure ground continuity, is not in any way
a substitute for the protective earth connection.
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7300A user Manual 2-3
Installation
2.2. MOUNTING
2.2.1. TYPES OF MOUNTING
Two types of mounting are possible: • DIN rail mounting or
• bulkhead mounting with screws
Current DIN rail mounting Bulkhead mounting
rating
Attachment plate DIN rail Attachment plate Screws
16 A to 40 A Two horizontal Two EN 50022 Two horizontal 4 x M4
plates symmetrical rails plates
≥63 A N/A Two horizontal 4 x M6
plates
Table 2-1 Attachment details for both mounting types
Mobile attachment hook
Catch to move
hooks downwards
Lower
attachment
plate
22
125
EN5 22
DIN Rails
Upper
attachment
plate
Attachment
hooks
Figure 2-1 Attaching the 73 A ≤ 4 A units
to DIN rails
2.2.2. ATTACHMENT PLATES
Two factory-fitted attachment plates on the rear of the 7300A thyristor units are used:
• to clip the unit to a DIN rail, or
• to screw the unit to a bulkhead.
Each attachment plate has: • attachment holes for bulkhead mounting, and
• two fixed hooks and two mobile hooks for clipping to a DIN rail.
(the mobile hooks are moved using a catch and spring).
2.2.3. MOUNTING ON DIN RAILS
For DIN rail mounting:
• fix two symmetric DIN rails (for units
rated 16 A to 40 A) in accordance with
the unit dimensions and safety
recommendations.
• bring the unit up against the top rail,
engaging the two fixed hooks on the top
attachment plate
• push the unit against the rail
• clip the unit onto the bottom rail using
the mobile hooks on the bottom
attachment plate, ensuring that they
are properly engaged.
To remove the unit:
• move the mobile hooks downward by
pulling the catch on the bottom
attachment plate
• unclip the unit from the rail.