Monitoring Relays Motor temperature Types DTA01, PTA01, DTA02, PTA02 • • • • • Motor temperature monitoring relay Measuring ranges: PTC according to EN 44081 Remote and local alarm reset (DTA02, PTA02) Output: 8 A SPDT relay normally energized For mounting on DIN-rail in accordance with DIN/EN 50 022 (DTA01, DTA02) or plug-in module (PTA01, PTA02) • 22.5 mm Euronorm housing (DTA01, DTA02) or 36 mm plug-in module (PTA01, PTA02) • LED indication for relay and power supply ON (DTA02, PTA02) • Galvanically separated power supply DTA01, DTA02 PTA01, PTA02 Product Description DTA01, DTA02, PTA01 and PTA02 are precise thermistor monitoring relays. They can be used to monitor the temperature of the coils of a motor with built-in PTC’s. The alarm status of the relay can be reset by either an Ordering Key external contact or an internal button (DTA02, PTA02). The test button allows the simulation of the fault condition (DTA02, PTA02). The red LED indicates the alarm status. DTA 01 C 230 Housing Function Type Item number Output Power supply Type Selection Mounting Output Supply: 24 VDC Supply: 24 VAC Supply: 115 VAC Supply: 230 VAC DIN-rail Plug-in DIN-rail Plug-in SPST SPDT SPDT SPDT DTA 01 C 724 PTA 01 C 724 DTA 02 C 724 PTA 02 C 724 DTA 01 C 024 PTA 01 C 024 DTA 02 C 024 PTA 02 C 024 DTA 01 C 115 PTA 01 C 115 DTA 02 C 115 PTA 02 C 115 DTA 01 C 230 PTA 01 C 230 DTA 02 C 230 PTA 02 C 230 Input Specifications Input (PTC) DTA01, DTA02: PTA01, PTA02: Measuring ranges Max cold PTC resistance Alarm setpoint Return setpoint Short-circuit detection Measurement voltage Contact input DTA02 PTA02 Disabled Enabled Alarm reset Output Specifications Terminals T1, T2 Terminals 5, 6 1500 Ω 3100 Ω ± 10% 1650 Ω ± 10% 0 to 10 Ω ≤2.5V (acc. to IEC 60034-11) Terminals Z1, Z2 Terminals 8, 9 > 10 kΩ < 500 Ω > 500 ms Specifications are subject to change without notice (01.12.04) Output Rated insulation voltage Contact ratings (AgSnO2) Resistive loads AC 1 DC 12 Small inductive loads AC 15 DC 13 Mechanical life Electrical life SPST or SPDT relay 250 VAC µ 8 A @ 250 VAC 5 A @ 24 VDC 2.5 A @ 250 VAC 2.5 A @ 24 VDC ≥ 30 x 106 operations ≥ 105 operations (at 8 A, 250 V, cos ϕ = 1) ≤ 7200 operations/h Operating frequency Dielectric strength ≥ 2 kVAC (rms) Dielectric voltage Rated impulse withstand volt. 4 kV (1.2/50 µs) 1 DTA01, DTA02, PTA01, PTA02 Supply Specifications General Specifications Power supply Rated operational voltage through terminals: A1, A2 (DTA01, DTA02) 2, 10 (PTA01, PTA02) 724: 024: Reaction time Alarm ON delay Overvoltage cat. III (IEC 60664, IEC 60038) Reset delay 24 VDC ± 20%, insulated 24 VAC ± 15% 45 to 65 Hz, insulated 115 VAC ± 15% 45 to 65 Hz, insulated 230 VAC ± 15% 45 to 65 Hz, insulated DC supply AC supply 2 kV 4 kV 4 kV 4 kV 4 kV 4 kV 115: 230: Dielectric voltage (1.2/50 µs) Supply to input Supply to output Input to output Rated operational power AC DC 2.5VA 1.5W Mode of Operation DTA01, DTA02, PTA01 and PTA02 monitor the resistance value of the PTC resistors connected to the terminals T1 and T2 (or 5 and 6). This value is related with their temperature (often the three coils of a motor) so to offer a prompt reaction to over temperature. Example 1 - DTA01 or PTA01 The relay operates as long as the measured resistance is below the rated value. The relay releases if the measured resistance (i.e. the temperature of the motor coils) exceeds the rated value. < 150 ms (resistance rising from -20% to +20% set value) < 500 ms (resistance decreasing from +20% to -20% set value) (15 min warm-up time) ± 1000 ppm/°C ± 0.5% on full-scale Example 2 - DTA02 or PTA02 The relay operates and the yellow LED is ON as long as the measured resistance is below the rated value. The relay releases and the yellow LED is OFF if the measured resistance (i.e. the temperature of the motor coils) exceeds the rated value. Provided that the resistance has dropped below the rated value (i.e. the temperature of the motor coils has returned cold), the relay operates when the interconnection between terminals Z1, Z2 or 8, 9 is interrupted or the reset button on the front of the unit is pressed. Accuracy Temperature drift Repeatability Indication for Power supply ON Relay ON Environment Degree of protection Pollution degree LED, green LED, yellow (EN 60529) IP 20 3 (DTA01, DTA02), 2 (PTA01, PTA02) -20 to 60°C, R.H. < 95% -30 to 80°C, R.H. < 95% Operating temperature Storage temperature Housing dimensions DIN-rail version Plug-in version Weight Screw terminals Tightening torque 22.5 x 80 x 99.5 mm 36 x 80 x 87 mm Approx. 150g Max. 0.5 Nm acc. to IEC 60947 UL, CSA Yes Electromagnetic Compatibillity According to EN 61000-6-2 According to EN 50081-1 Approvals CE Marking EMC Immunity Emission Wiring Diagrams L A1 T1 T2 L m µ 14 T 7 A2 11 5 N (-) DTA01 2 µ m 2 4 3 T 10 1 N (-) PTA01 Specifications are subject to change without notice (01.12.04) DTA01, DTA02, PTA01, PTA02 Wiring Diagrams (cont.) L L Z1 T1 Z2 A1 12 7 A2 9 8 14 T T2 µm µm 5 11 2 4 3 T 10 1 N (-) N (-) PTA02 DTA02 Operation Diagrams DTA01, PTA01 DTA02, PTA02 Power supply Power supply 3100 W Reset contact 1650 W Relay ON 3100 W 1650 W Relay ON Dimensions DIN-rail Plug-in 94 90 63 28.5 Specifications are subject to change without notice (01.12.04) 80 36 63 99.5 83.5 80 22.5 28.5 3