The speed relay of the processor controlled relay family from WALCHER combines the features of a measuring converter for speed (2...10 V / 0...10 V) and a digital indicator instrument as well as supervisory- or switch-on relay for the oper-ation of an asynchronous machine on a 19" Europe-type circuit board. The speed detection is derived from a frequency measure-ment. The measured quantity is the remanence voltage of the rotating, unenergized machine, approx. 3...5 V. Therfore, no tacho-pulse generator or other sensing unit is required. The measuring input is designed for an input voltage of 0,7...450 V at continous running and is separated galvanic. For the free programmable switching values (relay outputs or optical couplers) an accuracy of 0,1 % will be attained. The tresholds for under- over and rated speed are predeter-mined by code switches. At first, the resolution will be adjusted stepwise between 0,1 % and 5 % by using P3. After that and separated for over- and underspeed, the respective tresholds can be predeter-mined with the desired multiplier by using P1 and P2. Exceptional feature: Both output relays are programmed in a way that they only put out the switch-on or "good" command at a synchronous speed. After reaching the switch-on speed, both relays are energized if: nu < n < no (holding-current principle) Please indicate the following data when ordering: Type: WA-DR 6 E/A (with display) or WA-DR 6 E (without display) Rated frequency, the equipment is adjusted to: 50, 60 or 400Hz Analog output adjustment: 2...10 V or special performance Example: 1 piece WA-DR 6 E/A, 50 Hz, 2...10 V

Technical Data WA-DR 6 E/A <br>

Supply voltage DC(min/max)	20 V/30 V	rotating switch	Multiplier
Ripple(max)	15%	Synchronous rated speed	Rotated
Measuring input voltage	0,7V / 450V	Rotating switch P4	switch
Measuring range (min/max)	1 %/200 %	(on the panel)	P1/P2
Proof test voltage (seperted galvanics)	2500 V
Relay contacts (over- / underfrequency)
change-over contacts	1/1	0...300rpm
Max. relay contact current (sw.-on / perm. / sw.-off)	8/3/2 A
Max. relay contact voltage (DC/AC)	220/250 V
Max relay switching power (W/VA)	60/125
Optical coupler output current (DC)	10 mA
Optical coupler output voltage (DC at 10 mA)	24 V	Frequency
Optical coupler output voltage (DC at 1 mA)	70 V
Analog output, set by factory to	Overspeed	0...10 V
Analog output, alternatively set to	2...10 V	Rated speed
Galvanic separation analog output	none	Underspeed
Relay response- and release time (fixed)	25 msec.	Switch-on/ Underfrequency
LCD display resolution	1 rpm	ON
LCD display resolution	0,1 Hz	ON
OFF
OFF
Operating temperature range (min/max)	0/+70 C
Storage temperature range (min/max)	-55/+85 C	Switch-on/ Overfrequency
Temperature coefficient	0,005 %	ON
OFF
Proof test voltage input/ output	2000 V	OFF

Setting

Overspeed	[Rated speedP1p4>]
Underspeed	[Rated speedP1p4>]

Setting example:	Switch position:
Rated speed:	1500 rpm (synchronous)	Switch P4 on pos.8...Rated Speed (synchronous)
Overspeed:	1530 rpm = +2 %	Switch P3 on pos.6...Scaling 1 %
Underspeed:	1485 rpm= -1 %	Switch P2 on pos.2...Overspeed
Overspeed	= 1500 rpm21 % = 30 rpm	Switch P2 on pos.2...Underspeed
Underspeed	= 1500 rpm11 % = 15 rpm

Block diagram

Overspeed	Underspeed	Scalling	Speed range
P1	P2	P3	P4 (on the panel)
multiplier	multiplier

Ausgabemodul	=> Output module
Über	=> Over
Unter	=> Under
grün	=> green
rot	=> red
gut	=> good
Alarm	=> Alarm
CPU-Modul	=> CPU module
Impuls-/	=> Impulse-/Current
Stromwandler	=> transformer
Trennungsmodul	=> Separation module
Netzteil	=> Power supply
Nulldetektor	=> Zero-crossing detector
Meßeingang	=> Measuring input
Optokoppler-Ausg	=> Optical coupler outputs
LCD Anzeigetreiber	=> LCD display driver
LCD Anzeige	=> LCD display

Speed relay

Speed relay WA-DR 6 E/A

Technical Data WA-DR 6 E/A <br>