| Technical
Specification 7300A |
| POWER |
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| Nominal Current |
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16 A to 160 A at 45°C ambient (see order code) |
| Nominal Voltage |
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200 VAC to 500 VAC (see order code) |
| Frequency |
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47 to 63 Hz |
| Auxiliary supply |
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Self-powered from supply network, or external (115Vac or 230Vac +10%; -15%). Consumption: 10VA. |
| Dissipated power |
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1.3 W (approx): per amp per phase. Allow 2 W per amp per phase to include fuse dissipation |
| Cooling |
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Rating ≤100A: Natural convection. Rating ≥125A: Fan-cooled. |
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| LOAD |
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Three-phase industrial load: |
| Use Category |
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· AC-51 Resistive load with low temperature coefficient |
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· AC-55b Short wave infrared elements for units ≤100A |
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· AC-56a Transformer primary and Resistive load with high temperature coefficient |
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| CONTROL |
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| Control type |
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Analogue and digital communications option |
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· Remote analogue setpoint: 0-5Vdc or 0-10Vdc (100 kΩ =input impedance), 0-20mA or 4-20mA (250Ω input impedance) |
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· Potentiometer (10k) for manual setpoint (5Vdc supply available) |
| Control parameter |
Standard: |
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Load voltage squared (V2) |
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Option: |
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Apparent power (V x I), Load current squared (I2), Open loop |
| Linearity and stability |
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Better than ±2% of full scale (balanced supply and load) |
| Current limit (option) |
Phase angle: |
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Automatic control transfer from V2 to I2 or, from V x I to I2 with current recalibration set by potentiometer on front panel. |
| Burst mode 16 cycle base: |
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Current limited by threshold (quench) set using potentiometer on front panel. |
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A monitor signal is available in V x I for power and current calibration and maintenance |
| Transient current limit |
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Option for transformer primary control in burst firing mode: |
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· Safety firing angle ramp at first firing |
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· First firing delay adjustable using potentiometer on front panel |
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| FIRING MODE |
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| Firing at zero crossings |
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· ‘Burst mode’ base time: 16 or 64 cycles |
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· ‘Single cycle’: base time 1 cycle |
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· ‘Advanced single-cycle’: base firing time 1 cycle; non firing by half-cycles |
| Firing angle variation |
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· Phase angle |
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DIGITAL COMMUNICATION |
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Optional Modbus RTU digital serial communication running
at 9K6 or 19K2 baud, allows the units to be controlled and monitored
by a supervisory system |
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| LOAD MONITORING (ALARM OPTIONS) |
| Serious alarms (GRF) |
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Total load failure and thyristor short circuit detection.
Signaled by red ‘GRF” LED and alarm relay contact |
| Diagnostic alarm (DLF) |
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Partial load failure detection. Signaled by orange ‘DLF’ LED and alarm relay contact. |
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Sensitivity: |
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Detects the failure of at least one heating element for up to four identical elements connected in
parallel, depending on the load
configuration |
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The DLF option includes serious alarm monitoring (GRF) |
| Over temperature alarm |
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For fan cooled units operation stops if the temperature is exceeded.
Signaled by red GRF LED and alarm relay (with GRF option) |
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| OVERLOAD ALARM (OPTION) |
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| Overload alarm |
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Operation stopped if current threshold exceeded. |
| (ICO Chop off option) |
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Only available with zero crossing firing and DLF option (except for short wave infrared elements, transformers and codes VICL and V2CL). |
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Alarm threshold adjustable from 20 to 100% using potentiometer on front panel.
Signaled by red ‘ICO’ LED and alarm relay contact. |
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| ALARM RELAY |
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Available with alarm options. The relay contact (0.25 A 230 Vac; 32 Vdc) is either open or closed on alarm depending on the code. |
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| ENVIRONMENT |
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| Temperature |
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Use: 0°C to 45°C at max. altitude of 2000m. Storage: -10°C to 70°C |
| Pollution |
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Degree 2 acceptable (defined by IEC 664) |
| Humidity |
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RH 5% to 95% Non condensing |
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| INSTALLATION |
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| Mounting. Rating from 16 to 63A: |
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Two symmetric DIN rail EN50022 or bulkhead mounting (4 x M4 screws) |
| Rating from 80 to 100A: |
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Bulkhead mounting (4 x M4 screws) |
| Rating from 125 to 160A: |
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Bulkhead mounting (4 x M6 screws) |
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Allow a minimum of 10mm between units. Units must be mounted with fins running vertically |
| Max. cable size |
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16 and 25 amp: 6mm2. 40 and 63 amp: 16mm2. 80 and 100 amp: 35mm2. 125 to 160 amp: 120mm2 |
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| PROTECTION |
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| Thyristor protection |
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Varistor and RC snubber. High speed fuses: rating ≤100A: external (optional), rating ≥125A: internal. No fuse for short wave infrared
elements if firing at zero crossings or in phase angle firing mode without current limit. |
| Electrical protection |
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IP20 without adding additional protection.
Over voltage category II |
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| PHYSICAL DATA |
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| Rating (A) |
H(mm) |
W(mm) |
D(mm) |
| Basic |
DLF or GRF Comms |
GRF/DLF + Comms |
16-40
63-100
125-160 |
220
305
498 |
96
144
144 |
164
295
295 |
189
295
295 |
239
372
372 |
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