KEPCO MTW 30 User Manual

INSTRUCTION MANUAL

KEPCO

An ISO 9001 Company.

MTW

30 WATT TRIPLE OUTPUT

SWITCHING POWER SUPPLY

I — INTRODUCTION

SCOPE OF MANUAL. This instruction manual covers the installation and operation of the Kepco MTW 30W Switching Power Supply,

Model MTW 30-51212K.

DESCRIPTION. The Kepco MTW 30W is a PC card style, triple-output switching power supply. Units may be operated with a nominal 100 to

120V a-c and 220 to 240V a-c (input voltage range 85 to 265 Va-c), 50-60 Hz (input frequency range 47-440Hz). They will also operate on
110V to 370V d-c input. The MTW 30W employs a light weight ferrite core with 70 KHz switching frequency. Regulation is provided by pulse
width modulation. A trimmer provides fine adjustment of the 5V output. A FET power stage, operating in the flyback mode provides smooth iso­lated d-c outputs. DC Output power is shared between +5V, +12V and -12V (30W max. total). A thermistor circuit prevents excessive turn-on
current surge. Overvoltage protection is provided. Overcurrent protection with automatic recovery from short circuit is featured. A steel cover
(Model CA 40) is available as an option.

Table 1 contains output specifications. Section II (following) contains specifications and operating limits.

II — SPECIFICATIONS

The following specifications are at nominal input voltages at 25°C unless otherwise specified.

TABLE 1. MTW 30W OUTPUT SPECIFICATIONS

SPECIFICATION

OUTPUT VOLTS, d-c

SETTING TOLERANCE (V)

ADJUSTMENT RANGE

OUTPUT

CURRENT

(A)

SOURCE EFFECT

LOAD EFFECT

TEMPERATURE EFFECT

COMBINED EFFECT

TIME EFFECT (Drift)

OVERCURRENT (AMPS)

OVERVOLTAGE SETTING (VOLTS)

EFFICIENCY (typ.)

ACCEPTABLE OUTPUT CAP.

RIPPLE

AND

(1)

NOISE

(mV p-p)

(1) Switching component ≤ 20KHz, 0 to 100% load, 0 to 60

°C, tested with 100µF electrolytic and 0.1µF film capaci­tors across the load and connected to the power supply
via 5.9 in (150mm) wires.

(2) Hiccup type; automatic recovery after cause of overcur-

rent is removed. Avoid overcurrent operation to prevent
component degradation.

RATED

(6)

PEAK

(2)

100 Va-c
240 Va-c

(4)

(µFmax.)

ripple (typ)

(5)

(3)

MINIMUM

ripple (-10-0ªC)

spike noise (typ)

spike noise (-10-0ªC)

INPUT VOLTAGE: CAUTION: Operation at voltage below specified range for more than 10 minutes may cause component degradation.

Nominal 100-120V a-c, 200-240V a-c, range: 85-265V a-c (0 to 100% load, -10 to 60°C)
d-c range: 110 -370V d-c (Safety agency approval applies only to a-c input operation.)

INPUT SOURCE FREQUENCY:

Nominal 50/60 Hz; Range 47-440 Hz. (0 to 100% load, -10 to 60°C). At 440 Hz the leakage current exceeds the VDE safety specification
limit.

OUTPUT 1 OUTPUT 2 OUTPUT 3 CONDITON

5V +12 –12V +5V floating from ±12V

4.9 to 5.1

5.00 to 5.25

1% max. 0.4% max. 0.4% max. 85-132Va-c, 170-265Va-c
2% max. 1% max. 1% max. 10-100% load
2% max. 1% max. 1% max. -10 to 50°C
3% max. 2% max. 2% max. Overshoot at startup: 4% typ.
1% max. 1% max. 1% max. 1/2 to 8 hr.

4.7 min. 2.1 min. 0.48 min.

5.8 min. - -

140 max. 160 max. 160 max.

160 max. 180 max. 180 max.

(7)

3.0 1.2 0.3

0.5 0 0

4.5 2.0 0.45 Within 10 seconds.

76% 76% 76%
77% 77% 77%

10000 5000 3000

80 100 100

120 150 150

11.4 to 12.6 -11.4 to -12.6
FIXED FIXED

(3) Zener diode clamp method; protects load against faulty power supply;

operation could require power supply service.
(4) +5V output may drop during startup.
(5) For +5V output current from 0 to 0.5A, ±12V output current is 80% of rated

value.
(6) Peak current acceptable as long as rms output current within 10 seconds is

within rated value.
(7) Adjustable using 5V Output Voltage Adjustment trimpot.

30W

Fixed load resistance

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INPUT CURRENT: (maximum load at 25°C with nominal output voltage):

0.8A typ. (100 Va-c input, 100% load); 0.4A typ. (240 Va-c input, 100% load)

INPUT PROTECTION AND SOFT START: A thermistor circuit reduces start-up surge. Units are protected against shorts by an input

fuse. Fuse value 3.15A, 250V.

INPUT SURGE: First surge only, not including current flow into EMI filter.

20A typ. (100 V a-c, 100% load, 25°C cold start); 40A typ. (240 Va-c, 100% load, 25°C cold start)

LEAKAGE CURRENT:

0.55mA max, 0.35mA typ at 100V a-c and 60 Hz (single pole switching) in conformance to DENAN .

0.75mA max, 0.50mA typ at 240V d-c and 60 Hz (single pole switching in conformance to UL 1950/IEC 950)

POWER FACTOR: 0.55 typ. at 100 Va-c, 0.45 typ. at 240 Va-c

TRANSIENT RECOVERY: A step load change from 50% to 100% of rated load in 50 microseconds or more, produces no more than

4% output voltage excursion. Temperature range from -10 to 60°C.

OUTPUT HOLDING TIME: Upon input interruption the output is maintained for 140 milliseconds typical with 240 Va-c input voltage,

and for 20 milliseconds typical with 100 Va-c input voltage. The condition for output load is 100%.

START UP TIME: 300mS max. (+5V, ±12V) at 100 Va-c, 120mS max. (+5V, ±12V) at 240 Va-c. Output voltage may not rise with con-

stant current load. Output voltage may rise momentarily, then drop during brief input voltage interruptions.

OVERVOLTAGE PROTECTION: Fixed, factory set. See Table 1. The overvoltage circuit is set by Zener diode clamp.

OVERCURRENT: Hiccup type, output voltage returns to rated level upon removal of

cause (long term overcurrent could damage unit)

OPERATING TEMPERATURE: -10 to 60°C (start up -20 to -10°C). See the derating

plot, Figure 1. Do not allow the power supply to become dust covered because that will
decrease the cooling efficiency of the unit and cause insulation to deteriorate.

STORAGE TEMPERATURE: -30°C to + 75°C.

COOLING: Natural convection

ORIENTATION: Vertical or horizontal (see Figure 2).

HUMIDITY: 10% to 90% relative humidity, operating and storage, noncondensing,

wet bulb temperature ≤35°C

WITHSTANDING VOLTAGE:

(at 5 to 35°C ambient, 45 to 85% relative humidity, cutout current 10 ma):
Between input and output terminals, 3.0 KV a-c for 1 minute.
Between input and chassis, 2000V a-c for 1 minute.
Between output terminals and chassis, 500V a-c for 1 minute.

INSULATION RESISTANCE: (500V d-c, 5 to 35°C ambient, 45 to 85% relative

humidity) Between input and output, input and chassis, and output and
chassis:100 megohms minimum

VIBRATION: Three axes, one hour each, sweep time 10 min:, nonoperating

5-10 Hz., 10 mm amplitude;10-200 Hz., 2G (19.6m/s

SHOCK: Three axes, 60G (588m/s

axis, nonoperating, 1/2 sine pulse

2

), 11 ms ±5msec pulse duration, three shocks each

2

) acceleration

FIGURE 1. DERATING PLOT

SAFETY: Meets UL 60950-1.c-UL and TÜV Rheinland EN60950 (ambient temp. 50°C max.). Meets creepage and clearance require-

ments of DENAN Appendix 8 (at 100V a-c only). MTW 30W units are CE marked per the Low Voltage Directive (LVD), EN60950. [The
standards do not apply with DC input operation]

EMC - EMISSIONS:

Conducted Noise 0.15MHz to 30MHz: FCC Class B, VCCI-B, EN55011-B, EN55022-B

EMC - IMMUNITY:

ESD: EN 61000-4-2 Level 4, Normal operation.
Radiated Field Noise: EN 61000-4-3 Level 3, Normal operation.
Electrical Fast Transient/Burst (EFT): EN 61000-4-4 Level 3, Normal operation.
Surge: EN 61000-4-5 Level 4, no damage.
Conducted Noise: EN 61000-4-6 Level 3, Normal operation.
Power Frequency Magnetic Field: EN 61000-4-8 Level 4, Normal operation.
Voltage Dips, Short Interruptions, Voltage Variation: EN 61000-4-11, Normal operation.

WARRANTY: One year.

III — INSTALLATION

MOUNTING THE POWER SUPPLY: Refer to Figures 2, 3 and 4. The unit may be mounted on one mounting surface. The air sur-

rounding the power supply must not exceed the ambient temperature values given in the graph in Figure 1.

KEPCO, INC. " 131-38 SANFORD AVENUE " FLUSHING, NY. 11355 U.S.A. " TEL [phone] " FAX [phone]

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INSTALLATION (INSULATION): Install unit 0.3 inches (8mm) away from base with the use of 0.24 inch (6mm) diameter spacers

attached to the PC board. Keep at least 0.16 inches (4mm) spacing around and above the unit to comply with insulation and safety require­ments. An insulator must be used if the spacing is less than 0.16 inches (4mm) (see Figure 3).

VENTILATION: It is recommended to keep at least 0.40 inches (10mm) clearance from adjacent equipment for proper ventilation

CONNECTIONS: Connect a load to the +5V output of the power supply by connecting pin 6 of output connector CN2 (+5V) to the load (+)

terminal, and pin 5 (5V Return) to the load (–) terminal (see Figure 4 for input/output connector/pin locations). Connect a load to the +12V
output of the power supply by connecting pin 4 (+12V) of connector CN2 to the load (+) terminal, and pin 3 (±12V Return) to the load (–) ter­minal. Connect a load to the -12V output of the power supply by connecting pin 1 (–12V) of connector CN2 to the load (–) terminal, and pin 2
(±12V Return) to the load (+) terminal.The AC input power is applied via input connector CN1. Make sure to connect the AC input Neutral
and Line wires to pins 3 and 1, respectively, of CN1 (see Figure 2). See Table 2 for mating connector information. A Cable Kit (P/N 219-0486)
is available as an option from Kepco. The kit includes an input cable, terminated on one end with an input mating connector; and an output
cable, terminated on one end with an output mating connector.

FIGURE 2. MOUNTING DIRECTION

FIGURE 3. VENTILATION AND INSULATION REQUIREMENTS

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FIGURE 4. MTW 30W MECHANICAL OUTLINE DIAGRAM

TABLE 2. INPUT/OUTPUT MATING CONNECTORS

Connector MTW 30W Connector

Socket Housing Terminal Pin

(1)

(1)

VHR-5N

VHR6N

Input B3P5-VH-B

Output B6P-VH-B

NOTES:

1. Manufacturer: Japan, Solderless Terminal Mfg. Co. Ltd, VH Series

2. Optional cable kit (KIT 219-0486) includes one input and one output cable (one meter long) with mating connectors
for CN 1 (input) and CN2 (output), unterminated at other end.

Mating Connector

(1)

(1)

(2)

SVH-21T-P1.1

SVH-21T-P1.1

(1)

(1)

TABLE 3. ACCESSORIES

Accessory Part Number

Cable Kit KIT 219-0486 Includes one input and one output cable

(one meter long) with mating connectors
for CN1(input) and CN2 (output), untermi­nated at other end

Enclosure CA 40 Galvanized Steel

CA 40-R Cold Rolled Steel with RoHS Compliant

Zinc finish

Description

KEPCO, INC. " 131-38 SANFORD AVENUE " FLUSHING, NY. 11355 U.S.A. " TEL [phone] " FAX [phone]

http://www.kepcopower.com " email: [e-mail]

4 228-1547 REV 3 031908