RA / /6. Replaces: Table of contents RA /06.98

Transcription

1 Electronic amplifier for the control of proportional directional ales with electrical position feedback Models VT 5024 and VT 5025, Series 1X RA /06.98 Replaces: The amplifiers VT 5024 and VT 5025 are suitable for controlling direct actuated proportional directional ales with electrical feedback (Models 4WRE 6 V and 4WRE 10 V, Series 1X). eatures: Differential input Enable input with LED display Message "operational" ia an LED display Ramp generator with 1 sec. and 5 sec. range Controller for ale spool position Two clocked output stages Oscillator and demodulator for inductie position measurement with cable break detection Polarity reersal protection for the power supply H/A/D 5580/96 VT X (from series 17) Note: In the as supplied condition, the amplifier ramp times are set to 5 sec. (for setting of the ramp times of 1 sec. see page 5). Card holders: CH32 C-1X, see RA VT X/32, see RA Table of contents Description Page Technical data 2 Block circuit diagram / connection allocation 3 unctional description 4 Display / adjustment elements 5 Project / maintenance instructions / additional information 5 Ordering code 6 Unit dimensions 6 1/6

2 Technical data (for applications outside these parameters, please consult us!) Operating oltage V DC 24 VDC +40 % 5 % unctional range: Upper limit V DC (t) max 35 V Lower limit V DC (t) min 22 V Power consumption < 50 VA Power requirement I < 2 A use I S 2.5 A time lag, M5 x 20 Inputs: Command alue V e 0 to ±10 V Enable actie V >8.5 V inactie V <6.5 V Relay data: Nominal oltage V operating oltage V DC Response oltage V 16.8 V Release oltage V 2.4 V Coil resistance R 2150 Ω Ramp time (adjustment range) t 30 ms to approx. 1 sec. or 5 sec. (each ±20 %) Outputs: Output stage solenoid current / resistance VT 5024 I max 1.8 A ± 20%; R (20) = 5.4 Ω VT 5025 I max 2.2 A ± 20%; R (20) = 10 Ω clock frequency f clock frequency up to approx. 1.5 khz Drier for the inductie position transducer oscillator frequency f 2.5 khz ± 10% max. loading I 30 ma oltage amplitude (V pp ) V a 5 V per output Regulated oltage V ±9 V ± 1%; ±25 ma externally loadable Measurement sockets command alue "w" V w 0 to ± 6 V ( 6 V = +100%; +6 V = 100%); R i = 100 Ω actual position alue "x" V x 0 to ± 6 V (+6 V = +100%; 6 V = 100%); R i = 100 Ω Type of connection 32-pin blade connector, DIN , form D Card dimensions Eurocard 100 x 160 mm, DIN ront plate dimensions: Height 3 U, 5.06 inches (128.4 mm) Width solder side 1 HP, 0.2 inches (5.08 mm) Width component side 7 HP Permissible operating temperature range t + 32 to 122 (0 to 50 C) Storage temperature t 13 to 185 ( 25 to + 85 C) Weight m 0.33 lbs (0.15 kg) Note: or details regarding enironmental simulation test for the areas of EMC (electro-magnetic compatibility), climate and mechanical loading see RA U (explanation regarding enironmental compatibility). 2/6

3 3/6 Differential input "Ramp off" call-up Measurement zero (M0) is raised by 9 V in relation to the 0V operating oltage! External ramp Reference potential/gnd Command alue ±10 V + 9 V M0 9 V 8a 10a 6c 6a 18a 24c 26a 26c 24a A positie com. alue at the input (= negatie com. alue at measuring socket "w") causes a oltage increase in solenoid "a" and a flow from P to B and from A to T. A negatie com. alue at the input (= positie com. alue at measuring socket "w") causes a oltage increase in solenoid "b" and a flow from P to A and from B to T. Measurement socket "w": 6 V + 100% Measurement socket "x": +6 V + 100% 1 K5 t K5 2 J5, J6 w 8 = = on front plate K5 = Call-up relay t = Ramp time Enable 6 Operational A T Gx = µ PI i 4 5 PI PID H10 1 Differential amplifier 2 Ramp generator 3 Controller for spool position 4 Current controller 5 Output stage 3 x Zx J7 2c 32c 5 i 2a 32a 4c 4a 8c 10c 30c 28c 22c 22a 28a Position actual alue 0 to ± 6 V 0 V Enable input 11 Command alue 0 to ± 6 V + VDC Operating oltage 0 V 6 Monitoring 7 Oscillator/demodulator 8 Power supply 9 Position transducer 10 Threshold alue 11 Proportional ale 1 2 J7: "Enable" internal 9 Solenoid "b" Solenoid "a" Block circuit diagram / terminal allocation: VT 5024 and VT 5025 (from series 17) RA /06.98

4 unctional description The command alue input is a differential input (0 to ±10 V). When switching the command alue oltages, care must be taken to ensure that both signal lines are always separated or connected to the input. The subsequent ramp generator (2) generates from an applied step form input signal, a ramp shaped output signal. The time constant of the output signal is adjustable ia the potentiometer "t". The gien ramp time refers to a command alue jump of 100% and can, dependent on the jumper settings (J5, J6), be approx. 1 sec. or 5 sec. If a command alue jump less than 100% is switched to the input of the ramp generator, then the ramp time decreases accordingly. External time potentiometer and ramp "off" 500 K 8a 10a 28c 8a 10a Ramp "controllable" Ramp "on/off" Note: When using an external time potentiometer the internal ramp time potentiometer has to be set to its maximum. The maximum ramp time is reduced because the resistance of the external potentiometer is switched in parallel to the internal potentiometer (approx. 500 kω)! By switching relay K5 or ia an external jumper the ramp time is set to its lowest alue (approx. 30 ms). The output signal of the ramp generator (2) is the command alue and is applied to the PID controller (3), the measurement socket "w" on the front plate of the card and connection 4a (command alue to ramp/external limiting potential). A oltage of 6 V at the command alue measurement socket "w" relates to a command alue of +100%. The PID controller is especially optimized for the ale Model 4WRE.V (series 1X). The current output stages are controlled in relation to the difference between the position command alue and position actual alue. A positie command alue signal at the input to the amplifier controls the output stage for solenoid "a", and a negatie command alue the output stage for solenoid "b". The inductie positional transducer (9) acquires the position of the ale spool. The positional transducer AC oltage signal is conerted in the oscillator/demodulator (7) and fed back to the PID controller as an actual position alue. The zero point of the positional transducer (actual alue zero point) can be matched with the potentiometer "Zx" (on the circuit board). The amplification of the position actual alue is factory calibrated and must not be changed (±6V max. ale spool stroke). The output stages are enabled with a signal of >8.5 V. (Displayed by the yellow LED "H11" on the front plate). By setting the jumper J7, the output stages are permanently enabled independently of the condition of the enable input. The enable input is, therefore, ineffectie. The LED "H12" (operational) lights with fault free operation when: the enable signal is applied. the internal +9 V power supply is functional (amplitude and symmetry). there is no short circuit of the solenoid lines, and no cable break in the positional transducer lines. In the case of a fault, both output stages are immediately deenergized, the controller is switched off and the message "operational" is withdrawn. After correcting the fault, the card is immediately functional and the LED "operational" lights up again. ( ) = Cross reference to the block circuit diagram. 4/6

5 Display / adjustment elements RA /06.98 Max. ramp time approx.1 s or 5 s H10 - red LED "cable break" Zx: zero point position transducer Gx: amplification of the position actual alue (factory calibrated) LED display "enable" (yellow) LED display "operational" (green) J6 J5 X1 t - ramp time x - measurement socket for position actual alue w- measurement socket for command alue t A T J7 Enable The meaning of the jumpers on the card for the adjustments (label on the rear of the front plate) ramp time enable Jx = bridge Bridged 5 s J5 J6 1 s J5 J6 int. J7 ext. J7 Jx = open = deliery state or Bridge open Ramp time Enable Supplied condition Note: The circles ( ) denote the changes carried out by the customer. Project / maintenance instructions / additional information The amplifier card must only be plugged in or unplugged when the power is switched off! or the solenoid connection, plugs fitted with fly back diodes or LED displays must not be used! Only carry out measurements on the card with instuments R i > 100 kω! Measuring zero (M0) is raised by +9 V compared to the 0 V operating oltage and is not potentially separated, i.e. 9 V controlled oltage 0 V operating oltage. Therefore, do not connect measuring zero (M0) with the 0 V operating oltage! When switching command alues, use relays with dry circuit contacts (small oltages, small currents)! When switching card relays only use contacts with a loadability of approx. 40 V, 50 ma! With external control, the control oltage must only hae a residual ripple of 10%! Always separately shield the command alue and inductie position transducer cables; connect the shield to 0 V operating oltage on the card side, leae other end open (danger of earth loop)! Recommendation: Also shield the solenoid cables! or solenoid cables up to 150 ft (50 m) long use stranded 16 AWG (LiYCY 1.5 mm 2 ) cable. or longer lengths please consult us! The minimum distance to antenna cables, radio sources and radar systems must be at least 3 ft (1 m)! Solenoid and signal cables must not be laid in the icinity of power cables! Due to loading current of the smoothing capacitor, the fuse must be time lag. Do not connect the position transducer earth sign to earth! Attention: When using the differential inputs, both inputs must always be switched on or off simultaneously! Note: Electrical signal (i.e. actual alue) taken ia the ale electronics must not be used to switch off the machine safety functions! (Also see European standard regulations "Safety requirements of fluid technology systems and components - hydraulics", pren 982) 5/6

6 Ordering code VT 502_ 1X/ * Amplifier for proportional directional ales with electrical position feedback and V spool Model 4WRE 6 V -1X = 4 Model 4WRE 10 V -1X = 5 urther details in clear text 1X = Series 10 to 19 (10 to 19: unchanged technical data and connection allocation) Unit dimensions: dimensions in inches (millimeters) 3.94 (100) 3.5 (89) 3U 5.06 (128.4) t x w : M0 ± 6 V: = 100 % (2) 8HP 1.59 (40.3) (7) 6.5 (165) 7.09 (180) 6/6 Mannesmann Rexroth Corporation Rexroth Hydraulics Di., Industrial, 2315 City Line Road, Bethlehem, PA Tel. (610) ax: (610) Rexroth Hydraulics Di., Mobile, 1700 Old Mansfield Road, Wooster, OH Tel. (330) ax: (330) All rights resered Subject to reision Printed in U.S.A.