SERIES MST Card cage with 8 MST units and 1 MST 488-27 adapter MST power modules are a group of MST MODEL TABLE programmable power supplies that are compatible with Kepco’s single address, SPECIFICATION OUTPUT OUTPUT CURRENT RIPPLE EFFICIENCY multiple instrument serial control bus. VOLTAGE UNIT Amps mV p-p Percent The MST provide precision interactive Adjustment 45°C 55°C 65°C Source Switching 100% Load CONDITION (1) Range max max 120V a-c control in the 200 Watt power class. The 200 WATT PLUG-IN MODELS housings for MST, RA 55 and CA 400 contain a slot to accommodate an IEEE MST 6-20M 0-6 20 16 12.0 2.5 5 51% 488.2 adapter. If not used, an additional MST 15-12M 0-15 12 9.6 7.2 5 10 61% MST power module may be plugged into MST 25-8M 0-25 8 6.4 4.8 5 10 62% that slot. MST 36-5M 0-36 5 4.0 3.0 5 10 63% MST 55-3.5M 0-55 3.5 2.8 2.1 5 10 64% Kepco’s MST employ switching technology MST 75-2.5M 0-75 2.5 2.0 1.5 7.5 15 64% for high efficiency and high power density MST 100-2M 0-100 2 1.6 1.2 7.5 15 66% combined with linear stabilization techniques MST 150-1.2M 0-150 1.2 1.0 0.7 7.5 20 66% for accuracy and resolution. The switching front end is an advanced current mode (1) Includes spike noise to 20MHz. controller with power factor correction. A power factor of better than 0.98 ensures that FEATURES the MST meets EN 61000-3-2. A wide-range • Plug-in construction. a-c input accepts any mains voltage from 88 to 264V a-c. MST are packaged in a 4U, 7" • Up to nine 200-watt power supplies in a 4U housing. high 1/9th rack-width plug-in module that • Optional GPIB interface connects (8) eight MST modules to a mounts in a special housing called RA 55. single GPIB (IEEE 488.2) address with the capacity to control up MST modules plug in from the front and to 19 additional power supplies. may be unplugged and removed without shutting down the entire power system. N+1 • Switch-mode conversion, linear post regulator. redundancy is provided with forced current • Wide range a-c input: 88-264V a-c with built-in power factor sharing when like modules are mounted correction (PFC). together and wired in parallel. Eight different modules are offered from a 0-6V/20A unit to • Forced current sharing for N+1 redundancy connection. a 0-150V/1.2A rating. The RA 55 housing may be filled with either 9 power modules or with 8 power supply units, with the ninth slot devoted to the IEEE 488.2 interface, MST 488-27. KEPCO, INC. • 131-38 Sanford Avenue • Flushing, NY 11352 USA • Tel: (718) 461-7000 • Fax: (718) 767-1102 40 Email: hq@kepcopower.com • www.kepcopower.com/mst.htm Each module contains a single address, MST INPUT CHARACTERISTICS multiple instrument serial port. It is a 2-wire serial bus operating at 375KHz that can SPECIFICATI0N RATING/DESCRIPTION CONDITION address as many as 27 separate modules of a-c Voltage nominal 100-240V a-c Single phase either the MST or MAT design. This bus range 88-264V a-c Wide range can interface directly to a PC or to a GPIB Frequency nominal 50-60Hz >63Hz, input leakage controller. Model TMA PC-27 plugs into a current exceeds spec range 47-63Hz (400Hz) PC’s half card slot to drive MST and MAT Current maximum 3.6A rms 88V a-c input directly. A GPIB controller can interface Power Factor min 0.98 All source conditions through either the plug-in MST 488-27 or full load the stand alone TMA 4888-27. A path to a EfŢciency min See model table 100% load VXI cage is provided by 120V a-c Kepco’s model TMA VXI-27. Current Harmonics Within EN60555-2 limits MST features built-in relays to and EN61000-3-2 enable/disable the output and to allow polarity EMI Meets FCC and Class A reversal. Disabling the MST as a voltage CISPR 22 Class A source means opening the connection EMC Complies with IEC 61326-1 Class A between the power module and its load. Leakage 120V a-c <0.5mA Source frequency in Disabling the MST as a current source means Current 47-63Hz range 240V a-c <1.0mA shorting the power module’s output terminals. Circuit type Forward converter, current The polarity reversal relays provide for two- mode, linear post regulator quadrant operation. Switching typ 88KHz Load Frequency 65KHz PFC MST are CE marked per the Low Voltage Directive (LVD), EN61010-1. MST GENERAL SPECIFICATIONS SPECIFICATI0N RATING/DESCRIPTION CONDITION (1) Temperature -20° to +45°C Operating; (see model table) derate above 45°C -40° to +85°C Storage Humidity 0 to 95% RH Non-condensing operating & storage Shock 20g 11msec ±50% 3-axes half sine 3 shocks each axis Vibration 5-10Hz 10mm double Non-operating 1 hour amplitude each axis 10-55Hz 2g OUTLINE DIMENSIONAL DRAWINGS Altitude Sea level to 10,000 ft Fractional dimensions in light face type are in inches, dimensions in bold face type are in millimeters. Isolation Output-case 500V d-c 25°C, 65%RH Tolerance: ± 1/64" (0.4) between mounting holes Type of Construction Enclosed, plug-in style RA 55 accommodates ± 1/32" (0.8) other dimensions includes status LEDs 9 plug-in units; two digital meters, CA 400 handle on/off switch accommodates 4 plug-in units Cooling Internal d-c Exhaust to rear cooling fans TOP VIEW (1) MST will start at temperatures as low as -20°C. When self heating warms them to 0°C and above, the published specifications will be guaranteed. SIDE VIEW FRONT VIEW REAR VIEW BOTTOM VIEW KEPCO, INC. • 131-38 Sanford Avenue • Flushing, NY 11352 USA • Tel: (718) 461-7000 • Fax: (718) 767-1102 Email: hq@kepcopower.com • www.kepcopower.com/mst.htm 41 Programming Accessories MST OUTPUT CHARACTERISTICS for MST Models SPECIFICATI0N RATING/DESCRIPTION CONDITION Source Effect Voltage 0.001% Nominal ± 15% mains voltage Current 0.005% (1) Load Effect Voltage 0.002% 10% to 100% load (2) Current 0.005% Temperature Voltage 0.01% Per degree C Effect (0 to 50°C) Current 0.02% Time Effect Voltage 0.01% 0.5-8.5 hours (drift) Current 0.02% Programming Voltage 0.025% 12 bits Resolution Current 0.025% 12 bits Data Read Voltage 0.06% Of max voltage Back Accuracy Current 0.12% Of max current Display Voltage 3.5 digit LED, red Front panel Current 3.5 digit LED, red Front panel Status Voltage mode Green LED Indicators Current mode Amber LED MST 488-27 occupies the left slot of an RA 55 Current share Amber LED Output enabled Green LED MST 488-27 is a GPIB, IEEE 488.2 interface Polarity reversed Green LED from the MST’s internal single address, Output fault Red LED multiple instrument serial bus. It can drive all Output Enable Built-in power & sense relay eight remaining slots in the RA 55 plus 19 Polarity Reverse Built-in power & sense relay more power supplies. Transient Recovery 100 microseconds 50-100% load return to Time within stabilization band Overshoot None Turn on/off Error Sense 0.5V d-c Voltage allowance Rack Adapters for MST Models per wire Series Connection 500V d-c Maximum voltage (output floats) off ground Parallel Connection N+1 redundancy, forced Currents divide current share equally Over Voltage Protection Tracks output setting power shutdown Over Temperature Thermostat Latched, reset by Open Sense Wire Automatic detection with cycling source power shutdown Power off Backup Current Limit Tracks output current RA 55 at 110% (1) Or 0.5mV, whichever is greater (MST 6-20M load effect, voltage mode: 0.004%). RA 55 accommodates nine (9) plug-in MST (2) Plus a 0.015% settling effect. power supplies. Each power module can produce up to 200 watts, so that the total for MST PHYSICAL CHARACTERISTICS the rack can be 1800 watts. SPECIFICATI0N RATING/DESCRIPTION CONDITION Dimensions/ English 7" x 1.83" x 20" Excluding front Module switch & handle Metric 178 x 46.5 x 509mm Dimension English 7" x 19" x 20.89" Mounts in 24" RA 55 deep cabinet Metric 178 x 483 x 531mm Dimension English 7" x 9.6" x 20.89" Mounts in 24" CA 400 deep cabinet Metric 178 x 244 x 531mm Weight/ English 9.0lbs. CA 400 Module Metric 4.1Kg Housing for (5) MST modules Source Connection Two 3 contact Two line cords split RA 55 terminal blocks the input power CA 400 accommodates up to (5) MST power modules. The left most slot can accommo- Load Connection Each module mates with a At the rear of the 6-pin connector containing RA 55 date the MST 488-27 interface that will ± output sense, ground allow the remaining four (4) MST modules and current share to be fully programmed via the IEEE 488.2 Programming Two control bus At the rear of the instrumentation bus. Connections connectors allow racks RA 55 to be “daisy-chained” KEPCO, INC. • 131-38 Sanford Avenue • Flushing, NY 11352 USA • Tel: (718) 461-7000 • Fax: (718) 767-1102 42 Email: hq@kepcopower.com • www.kepcopower.com/mst.htm