HWT81

KEY FEATURES

  • Control relay designed to monitor the temperature in lift machine rooms in accordance with standard EN81
  • PT100 input
  • Adjustable control between 5 °C and 40 °C
  • Independent setting of high and low thresholds
FunctionNominal voltage (V)3-phase controlCode
Under/Overtemperature window mode + phase sequence and failure24 →240 V ∿/⎓3 x 208 →480 V ∿84874130 Obsolete

Specifications


Phase control voltage range 208 V →480 V (-15 % / +10 %) *
Phase failure detection with regeneration > 30 % of the average of the 3 phases
Frequency of measured signal 50 →60 Hz ± 1 Hz
Relay drop-out voltage (phase failure) 70 %
3-phase input resistors 600 KΩ

Maximum response time in the event of a 3-phase fault (ms) 500 ms

Type of output 2 single pole NO relay

Galvanic isolation of power supply/measurement Yes, between power supply and PT100 (transformer) Yes, between power supply and output (transformer and relay) Yes, between power supply and 3-phase network (transformer) Yes, between 3-phase network and output (relay) No, between 3-phase network and PT100 (leakage current limited by several high-value resistors) Yes, between PT 100 and output (relay)
Nominal insulation voltage 400 V

* 3-phase mains with earth

Supply voltage Un 24 V →240 V ∿/⎓
Voltage supply tolerance -15 %, + 10 % ∿ -10 %, +10 % ⎓
Operating range 20,4 V →264 V ∿ 21,6 V →264 V ⎓
Polarity with ⎓ voltage No
∿ supply voltage frequency 50 / 60 Hz ±10 %
Power consumption at Un 3.5 VA in ∿/0.6 W in ⎓
Immunity from micro power cuts 10 ms

Low temperature measurement selection -1 °C, 1 °C, 3 °C, 5 °C, 7 °C, 9 °C, 11 °C
High temperature measurement selection 34 °C, 36 °C, 38 °C, 40 °C, 42 °C, 44 °C, 46 °C
Temperature measurement input resistance 1330 Ω
Fixed hysteresis 2 °C
Display precision ± 2 %
Max. length of Pt100 probe cables 10 m

Delay on thresold crossing 1 →10 s
Display precision 0, + 10 %
Reset time 8 s
Delay on pick-up 200 ms
Maximum response time on disappearance of fault 3.5 s for a temperature fault 500 ms for a phase fault

Type of contacts No cadmium
Maximum breaking voltage 250 V ∿/⎓
Max. breaking current 5 A ∿/⎓
Min. breaking current 10 mA / 5 V ⎓
Electrical life (number of operations) 1 x 104
Breaking capacity (resistive) 1250 VA ∿
Maximum rate 360 operations/hour at full load
Operating categories acc. to IEC/EN 60947-5-1 AC 12, AC 13, AC 14, AC 15, DC 12, DC 13, DC 14
Mechanical life (operations) 30 x 106

Insulation coordination (IEC/EN 60664-1) Overvoltage category III : degree of pollution 3
Rated impulse withstand voltage (IEC/EN 60664-1) 4 kV (1,2 / 50 μs)
Dielectric strength (IEC/EN 60664-1) 2 kV ∿ 50 Hz 1 min.
Insulation resistance (IEC/EN 60664-1) > 100 MΩ - 500 V ⎓

Display power supply Green LED
Temperature indication Yellow LED (HWT81)
"Phase" indication Yellow LED (HWT81)
High threshold relay Yellow LED (HT81, HT81-2)
Low threshold relay Yellow LED (HT81, HT81-2)
Casing 35 mm
Mounting On 35 mm symmetrical DIN rail, IEC/EN 60715
Mounting position All positions
Material : enclosure plastic type VO to UL94 standard Incandescent wire test according to IEC 60695-2-11 & NF EN 60695-2-11
Protection (IEC/EN 60529) Terminal block : IP 20 IP 30 casing
Weight 121 g
Connecting capacity IEC/EN 60947-1 Rigid : 1 x 42 - 2 x 2.52 mm2 1 x 11 AWG - 2 x 14 AWG Flexible with ferrules : 1 x 2.52 - 2 x 1.52 mm2 1 x 14 AWG - 2 x 16 AWG
Max. tightening torques IEC/EN 60947-1 0,6 →1 Nm / 5,3 →8,8 Lbf.In
Operating temperature IEC/EN 60068-2 -20 →+50 °C
Storage temperature IEC/EN 60068-2 -40 →+70 °C
Humidity IEC/EN 60068-2-30 2 x 24 hr cycle 95 % RH max. without condensation 55 °C
Vibrations according to IEC/EN60068-2-6 10 →150 Hz, A = 0.035 mm
Shocks IEC/EN 60068-2-6 5 g

Marking CE (LVD) 73/23/EEC - EMC 89/336/EEC
Product standard NF EN 60255-6 / IEC 60255-6 / UL 508 / CSA C22.2 N°14 / EN 81-1
Electromagnetic compatibility (EMC) Immunity EN 61000-6-2/IEC 61000-6-2 Emission EN 61000-6-4/EN 61000-6-3 IEC 61000-6-4/IEC 61000-6-3 Emission EN 55022 class B
Certifications UL, CSA, GL
Conformity with environmental directives RoHS, WEEE

Technical sketches

Temperature control relays for lift machine rooms are designed for monitoring the temperature between 5  °C and 40  °C according to standard EN81.

HWT81 - Under/Overtemperature

HWT81 - Under/Overtemperature
Legend
1-
High threshold
2-
Low threshold
3-
Hysteresis
4-
Monitored temperature
5-
Threshold crossing delay adjustable on front face (Tt)
As long as the temperature controlled by the PT100 stays between the two preset thresholds on the front face, the temperature relay is closed. When the temperature exceeds one of the preset thresholds on the front face (upper or lower threshold), the preset time delay on the front face (Tt) is activated. The yellow temperature LED (R1) flashes. At the end of the time delay, if the temperature still exceeds the preset threshold, the output relay opens and the yellow LED is extinguished. The output relay R1 closes instantaneously when the temperature returns within the window of the two preset thresholds on the front face plus or minus the fixed hysteresis. The unit also monitors correct sequencing of phases L1, L2 and L3 of the 3-phase network and the total phase failure in the event of phase regeneration (<70 %). After a time delay on pick-up (t) and as long as the presence and sequence of the phases are correct, relay R2 and the R2 "phase" LED are active. When a fault appears, the "phase" relay opens and the R2 "phase" LED is extinguished instantly (response time from the appearance of a fault). On disappearance of the fault, both relay R2 and the phase control LED are activated (response time from the disappearance of a fault). See "Phase failure and phase sequence" curve on page If the PT100 probe is wired incorrectly (missing or short-circuited), output relay R1 opens and the yellow R1 LED flashes.

HWT81

HWT81
Legend
1-
Fusible ultra rapide 1 A ou coupe circuit
PH RMC2 HWT81

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