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Thermal protection Soft starter thermal protection The thermal protection is provided by the temperature sensor installed on the heatsink. Motor thermal protection Standard IEC 60947-4-2 defines the protection classes giving the starting capacities of the motor (warm or cold start) without thermal faults. Different protection classes are given for a COLD state (corresponding to a stabilized motor thermal state, switched off) and for a WARM state (corresponding to a stabilized motor thermal state, at nominal power). 22 • The soft starter is factory set to protection class 10. • This protection class can be modified using tHP parameter in SEt menu. • The motor thermal state is stored in memory. No estimate of motor cooling is calculated while power of the control part is off. • An overload alarm is activated if motor thermal state exceeds 110%. • A thermal trip OLF stops the motor if motor thermal state exceeds 125%. • If the thermal protection has not been disabled, the thermal trip can be indicated by a relay depending on output assignment. • After the motor has stopped or the soft starter has been switched off, the thermal state is saved. At next start or switch on, the thermal protection value is restored. • If a special motor is used (explosion proof, submersible, etc.), the thermal protection should be provided by PTC probes. RISK OF DAMAGE TO THE MOTOR See Motor thermal protection with PTC probes, page 25. CAUTION The use of external overload protection is required under the following conditions: • Running multiple motors • Running motors rated at less than 40% of the nominal soft starter current • Using motor switching • Using special motor (explosion proof, submersible, etc...) Failure to follow these instructions can result in equipment damage.
Thermal protection Cold curves t (s) Trip time for a standard application (class 10) Trip time for a severe application (class 20) Class 30 Class 20 Class 10 Trip time for a severe application (class 30) 3.5 In 3.5 In 3.5 In 32 s 63 s 95 s 23
Page 1: 2354235 11/2008 Soft start - soft s
Page 4 and 5: AlImportant Information NOTICE Read
Page 6 and 7: Documentation structure The followi
Page 8 and 9: Receiving and handling Introduction
Page 10 and 11: Selection Torque characteristic Sof
Page 12 and 13: Selection Standard application, SH3
Page 14 and 15: Dimensions and weights SH31-7.5 to
Page 16 and 17: Dimensions and weights SH31-110 to
Page 18 and 19: Mounting Soft starter ventilation O
Page 20 and 21: Mounting - Fan option Fan for frame
Page 24 and 25: Thermal protection Warm curves 24 t
Page 26 and 27: Wiring Installation Precautions Goo
Page 28 and 29: Wiring Refer to application diagram
Page 30 and 31: Wiring The SH31-.../4 range (230-44
Page 32 and 33: Wiring - power terminals Power Obse
Page 34 and 35: Wiring - power terminals Power conn
Page 36 and 37: Wiring - control terminals Electric
Page 38 and 39: Wiring - in line connection - appli
Page 40 and 41: Wiring - in line connection - appli
Page 42 and 43: Display terminal Functions of the k
Page 44 and 45: Remote keypad display - option The
Page 46 and 47: Programming Menu structure Two menu
Page 48 and 49: List of parameters Parameters acces
Page 50 and 51: Configuration menu (ConF) *: Write
Page 52 and 53: Settings menu (SEt) 52 Code Name/De
Page 54 and 55: Advanced adjustments menu (AdJ) (1)
Page 56 and 57: Advanced protections menu (PrO) (1)
Page 58 and 59: Advanced protections menu (PrO) (1)
Page 60 and 61: Advanced IO menu (IO) (1)Only avail
Page 62 and 63: Advanced communication menu (COP) (
Page 64 and 65: Utility menu (UtIL) *: Write only w
Page 66 and 67: Command channel Behavior on channel
Page 68 and 69: Modbus Function This section descri
Page 70 and 71: Modbus Function Write one output wo
Page 72 and 73:
Modbus Function Error management Ex
Page 74 and 75:
Maintenance Servicing It is advisab
Page 76 and 77:
Diagnostics / Troubleshooting Remot
Page 78 and 79:
Parameter Index and Modbus addresse
Page 80 and 81:
Parameter Index and Modbus addresse
Page 82 and 83:
Annex 1: UL508 schematics SH31.../4
Page 84:
Annex 2: Short-circuit rating and b
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