Features • Power amplifier for proportional directional valves • Internal controlled by a modern microcontroller • Compact housing • Adjustment via potentiometer • Imin, Imax, RAMP and PWM-frequency adjustment via potentiometer • Current range (per DIL switch): 0,8A and 1,6A Technical data Power supply [VDC] 10…30 (incl. ripple) Current consumption [mA] <60 + solenoid current External fuse [A] 3 (fast) Analoque inputs [V] +/- 10 [V] +/- 8 [V] 0…5…10 [V] 0…4…8 [mA] 4…12.20 [V] +/- 5 [V] +/- 4 [mA] 4…20 Reference voltages [V] 8; 10 mA max. PWM outputs max. load [A] 0,8 or 1,6 (per DIL switchable) Frequency [Hz] 70…125 Sample time (signal conditioning) Depending of the PWM frequency Adjustments Imin [%] 0…60 (0=preadjusted) Imax [A] 0,7…1,6 [A] 0,4…0,8 RAMP [s] 0,05…15 (0,05=preadjusted) PWM Frequency [Hz] 70…125 (125=preadjusted) Housing Snap-On Module EN 50022 Polyamide PA6.6 Combustibility class V0…V2 (UL94) Protection class [IP] 20 Temperature range [°C] -20…55 Humidity [%] <90 (not condensing) Dimensions [mm] 120(d) x 100(h) x 23(w) Connections RS232: 3,5mm JISC-6560 4x4pol. Screw terminals PE: direct via DIN rail EMC EN 50081-1 EN 50082-2 Block diagram AMCA HYDRAULIC FLUID POWER B.V. Tel. +31 (0)50 3023577 P.O.BOX 18 9790 AA Ten Boer NL Fax. +31 (0)50 302 1226 B.Kuiperweg 33 9792 PJ Ten Post NL e-mail: [email protected] The Netherlands homepage: http://www.amca-nl.com Digital Valve Amplifier Series PROam 20 Publ. L-EA-20-E-05/07 Power supply 7 8 1 2 12..30V 0V PROam20 Power stage MIN A MAX A 10 9 Input +/- 10 V, +/- 8 V, 0...10 V 0... 8 V 12 8 V reference voltages DITHER RAMP 5 V 8 V Enable 15 MCU 3 4 MAX B MIN B 11 S1.1 S2.1 S2.2 Solenoid current range P1 P2 P5 P6 P3 P4 Solenoid A Solenoid B S1.2 S1.3 4... 20 mA 13