Delta Elektronika SM 7-80 Instruction Manual

Also see for SM 18-50: Product manual

Contents

Delta Elektronika SM 7-80 Instruction Manual Manual pdf 16 page image

SM800 DELTA ELEKTRONIKA BVOctober 2007 OPERATING MAINTENANCE TROUBLE SHOOTING CALIBRATING Page 4 - 6TROUBLE SHOOTING1) GENERAL• In case you need assistance for repairing a unit, please contactour engineers using the address "Support@Delta-Elektronika.nl".• In case you want us to repair the unit, please first fill out theRMA-form before sending the unit to us. Adding a detailed faultdescription will help us to repair the unit as soon as possible.On our website www.DeltaPowerSupplies.com the RMA-formcan be found under 'Support'.2) NO OUTPUT (manual control)• Check the LEDs ‘Remote CV’ and ‘Remote CC’ on the front panel,they should be off. Disable Keylock and press the REMOTE/LO-CAL button to turn both LEDs off.• The LED ‘Output On’ should be on. If this LED is off, disable Key-lock and push the button ‘OUTPUT ON/OFF’.• Check the connections on the SENSE BLOCK (at rear panel),there should be a link between + and S+ and between – and S–(see fig. 4 - 16).• Check if there is a link in the Interlock connector (if not, the RSDLED will be on).• Set both the CV- and CC-limit potentiometer (at front panel) atmaximum (fully clock wise).• Turn both the CV and CC potentiometers a few turns clock-wise.A voltage should be present on the output.• Discon nect the cables from the output and check if now there's avoltage present on the output. If this is the situation, use a loadwith a higher impedance or use a second power supply in parallel.3) PROGRAMMING DOES NOT WORK OK• Check the unit is in Remote mode (Remote CV and/or Remote CCLED should be on).• The unit works OK in manual control, but in programmingmode the output voltage / current has a large error.Probably the fuse in series with Ø (pin 1) of programmingconnector tripped, the fuse (F27_1 = 650 mA) is a self-resettingtype (see fig. 4 - 14).• To check the fuse (F27_1) measure the voltage between Ø andthe minus output, during the fault condition. The voltage shouldonly be a few mV, a high voltage means that an unwanted currentis flowing through pin 1 of the prog. connector.Please check why current is flowing through pin 1 (see next para-graph 4) and fig. 4 - 15).4) PROGRAMMING OFFSETS• Unwanted offsets in the programming can be caused byearth loops.Fig. 4 - 15 shows a typical earthing problem. In case the load has acon nec tion to earth and the programming source as well, prob-lems could occur. Improper choice of the earthing point of the loadcan give a voltage drop of ∆V1. Connecting the minus or zero to asep arate earth connection can give a voltage drop of ∆V2. Be-cause the internal wires of the programming input are thin, thevoltage drops ∆V1 and ∆V2 will be across the internal wiring aswell. Resulting in an error voltage in series with the programmingvoltage.• The best solution for this is to use a floating programming source,a floating load or the optional internal ISO AMP CARD (δ-product).5) STATUS OUTPUTS FAIL• Check fuse F27_2 in series with Ø (pin 8 of CON E) (see fig. 4 -14). To check the fuse measure the voltage between Ø and the mi-nus output, a high voltage means too much current flowingthrough the fuse. F27_2 = 650 mA, self resetting.fig. 4 - 14Location of programming fuses on P647P647 is situated directly behind the rear panelfig. 4 - 15Unwanted programming offsets

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