Global Valves - BELIMO - #27

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ENG-93001-93621-08.04-1M • Printed in Switzerland • ZSD • Subject to technical modifications BC 27 Wiring diagrams of NV..-MFT../AV..-MFT.. Wiring diagrams of NV../AV.. multifunctional The control signal can be inverted by adjusting slide switch S3.1 to the "ON" position, and the valve closes as the control signal increases. This is a simple way of matching the sequences in the actuator. The closing point is down with fewer than 20% of the valves that are used and slide switch S3.2 must be set to the "ON" position. The position feedback U5 is likewise matched to the closing point. The NV..-MFT.. linear actuator with MFT can also be used for 3-point control. The actuator must, however, be parameterized for 3-point control and provided with a 4-wire connection. Note: Only works with a nominal voltage of AC 24 V! A typical use for "100%" override control is in a frost protection circuit. Whether or not the frost thermostat has to interrupt the signal conductor to the controller "d" depends on the make of controller being used (not necessary if the signal output at the controller is short-circuit-proof and protected against polarity reversal). Y (DC 0...10 V) U5 (DC 2...10 V) T ~ AC 24 V – + DC 24 V ~ Y2 T- + 1 2 3 4 5 YZ NV24-MFT NVF24-MFT(-E) NVG24-MFT AV(Y)24-MFT ! NV(Y)24-MFT U Symbols "Direct" signal "Inverted" signal Closing point "up" Closing point "down" Control signal min. (e.g. Y = 2 V) Control signal max. (e.g. Y = 10 V) Meas. signal min. (e.g. U = 2 V) Meas. signal max. (e.g. U = 10 V) Actuator spindle moves Direction of stroke Valve closing point S3.1 S3.2 H Y Ä OFF OFF x x RETRACTING x x EXTENDING �Þ OFF ON x x EXTENDING x x RETRACTING H Y Ä ON1) OFF x x EXTENDING x x RETRACTING �Þ ON1) ON x x RETRACTING x x EXTENDING 1) If the controller generates a negative signal (< 0.15 V), slide switch S3.1 must not be set to "ON" if the operating range of the actuator is set to 2…10 V (exception: start point in the parameterized operating range = 0.5 V). Connection via safety isolating transformer Modulating (optional with feedback) T ~ AC 24 V a b ~ Y2 T 1 2 3 4 5 YZ NV24-MFT NVF24-MFT(-E) NVG24-MFT AV(Y)24-MFT U5 (DC 2...10 V) ! NV(Y)24-MFT U Symbols "Direct" signal "Inverted" signal Closing point "up" Closing point "down" Relay contact a (Y1) Relay contact b (Y2) Meas. signal min. (e.g. U = 2 V) Meas. signal max. (e.g. U = 10 V) Actuator spindle moves "3-point" stroke direction Valve closing point S3.1 S3.2 0 0 *) *) stops stops H+ Y2 Y1 H- Ä OFF OFF 1 0 m EXTENDING 0 1 m RETRACTING �Þ OFF ON 1 0 m RETRACTING 0 1 m EXTENDING H+ Y2 Y1 H- Ä ON OFF 1 0 m RETRACTING 0 1 m EXTENDING �Þ ON ON 1 0 m EXTENDING 0 1 m RETRACTING *) Measuring signal U5 according to position m: If relay contact a or b is in switch position 1 for longer than the running time (150 s) Connection via safety isolating transformer MFT actuator parameterized with 3-point control (optional with feedback) – T ~ AC 24 V - + DC 24 V ~ Y2 T + c d 1 2 3 4 5 YZ NV24-MFT NVF24-MFT(-E) NVG24-MFT AV(Y)24-MFT Y (DC 0...10 V) U5 (DC 2...10 V) ! NV(Y)24-MFT U Symbols "Direct" signal "Inverted" signal Closing point "up" Closing point "down" Relay contact c Relay contact d Meas. signal min. (e.g. U = 2 V) Meas. signal max. (e.g. U = 10 V) Actuator spindle moves "Override" stroke direction Valve closing point S3.1 S3.2 H Y Ä OFF OFF 1 0 x EXTRACTING ON 1 0 x RETRACTING �Þ OFF ON 1 0 x RETRACTING ON 1 0 x EXTRACTING Connection via safety isolating transform Override control 100% (optional with feedback) from controller