Page 26 - Elko relays

24

THERMISTOR PROTECTION RELAY TER-7

Features:
»»
» » Universal supply AC/DC 24-240V
»»
» » Monitors temperature in range of PTC thermistor
» » PTC sensor in motor windings
»»
»»
» » MEMORY function - manual reset
»»
» » Possibility of remote reset
»»
» » Monitoring short circuit or sensor disconnecting
»»
» » Output contact: 2x changeover 8A
» » LED indication
»»
» » 1-MODULE, DIN rail mounting
»»
Technical parameters TER-7 Description
Function: temperature of motor winding
Supply Terminals: A1 - A2
Supply voltage: AC 24-240V, DC 24V
Consumption: 2VA
Supply voltage tolerance: -15%; +10%
Measuring circuit
Measuring terminals: T1 - T2
Cold sensor resistance: 50 - 1.5
Upper level: 3.3k
Lower level: 1.8k
Sensor: PTC (part of motor)
Sensor failure indication: red LED
Accuracy
Accuracy in repetition: <0.5%
Switching difference: +/-5%
Temperature dependance: <0.1%/ C
0
Output
Number of contacts: 2 x changeover, (AgNi)
Rated current: 8A / AC1 Connection, Functions
Switching capacity: 2000 VA / AC1, 192 W / DC
Inrush current: 10A / < 3s
Switching voltage: 250V AC1 / 24V DC
Min. breaking capacity DC: 500mW
Output indication: red LED
Mechanical life: 3 x 10 7
Electrical life (AC1): 0.7 x 10 5
Other information
Operating temperature: -20.. + 55 C
0
Storage temperature: -30.. + 70 C
0
Electrical strength: 4 kV (supply - output)
Operating position: any Function description
Mounting: DIN rail EN 60715 The relay monitors temperature of the motor winding with a PTC thermistor which
Protection: IP40 is mostly placed inside the motor winding. Resistance of the PTC
Overvoltage category: III thermistor runs to a max 1.5 k in the cold stage. When temperature increases the
Pollution degree: 2 resistance goes up and when it exceeds the limit of 3.3 k ,the contact of output
Max. cable size: max. 2.5mm / with sleeve 1.5mm 2 relay switches off the contactor controlling the motor. When temperature decreases
2
and thereby decreases thermistor resistance under 1.8 k ,the output contact of the
Dimensions: 90 x 17.6 x 64mm relay again switches on.
Weight: 67g
Standards: EN 60730-2-9, EN 61010-1
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