Kenwood PD8-20 User manual

COO/AN>DI
CONSTANT-VOLTAGE
CURRENT POWER SUPPLY
PD8-20(D)
PD8-30(D)
PD18-20(D)
PD18-30(D)
PD35-20(D)
SERVICE MANUAL
TRIO-KENWOOD CORPORATION

WARNING
The following instructions are for use by qualified
personnel only. To avoid electric shock, do not per-
form servicing other than contained in the operating
instructions unless you are qualified to do so.
SAFETY
Before connecting the instrument to a power source,
carefully read the following information, then verify that
the proper power cord is used and the proper line fuse is in-
stalled for power source. If the power cord is not applied
for specified voltage, there is always a certain amount of
danger from electric shock.
Line voltage
This instrument operates using ac-power input voltages
that 100/120/220/240 V at frequencies from 50 Hz to
60 Hz.
Power cord
The ground wire of the 3-wire ac power plug places the
chassis and housing of this instrument at earth ground. Do
not attempt to defeat the ground wire connection or float
this instrument; to do so may pose a great safety hazard.
The appropriate power cord is supplied by an option that is
specified when the instrument is ordered.
Waming
If groundings, especially points | (Vg) and ¥ (Ig), are short-
circuited during servicing, it could lead to pattern damage
due to large amount of current flow on the PCB. Take ap-
propriate care.
CONTENTS
SPECIFICATIONS. .............ccceeesceseneeeeseneenes
DISASSEMBLY ............:02cceceeeeceeseneeceneees
BLOCK DIAGRAM .............2:::ecceeseeesereeeeeee
CIRCUIT DESCRIPTION ............0ccseceseeeeseees
ADJUSTMENT.........c0:ecseseereccecsvcersrseeseeees
TROUBLESHOOTING. ..........:ccccesceeceetsereeeees
PARTS LIST .......... ce ceceseeceeeeeeeceerseneenennees
SCHEMATIC DIAGRAM. ............000.eeseceeeees
P.C. BOARD .........ce cece eccceeeeteeeenneceneeneeecens
DISASSEMBLY ............2:0ccsseseeceeseceeeeeeeees
SEMICONDUCTORS ............::cccseseceeseeeeeees

SPECIFICATIONS
[ Model PD | 8-20 (D) | 8-30 (D) 18-20 (D) [ 18-30 (D) | 35-20 (D)
| Output
Output voltage 10-positions 0to8V Oto8V Oto 18 V Oto 18 V ae Oto 36V
Resolution (theoretical) 1.4 mV 1.4 mV 3 mV 3 mV 6 mV
Output current 1-position | Oto 20A Oto 330A 0to 20A 0 to 30A Oto 20A
Resolution (theoretical) 30 mA 45 mA 30 mA 45 mA 30 mA
Voltage regulation (CV)
With input changes of + 10% Note 1) 0.005% +1 mV
With load changes of 0 to 100% Note 1) 0.005% +1 mv] 0.005% +2 mV
Ripples/noises (10 Hz to 1 MHz} rms Note 2) 0.5 mV rms
Transient response, (standard value) 100 ysec, typical
Temperature characteristic, (standard value) 100ppm/°C, typical
Remote control resistance/voltage approx. O to 10 kQ/0 to 10 V |
Current regulation (CC)
With input changes of + 10% 2mA 3mA 5 mA 5 mA 5 mA
With load changes of 0 to 100% 5 mA 5 mA ! 5 mA 5 mA 5 mA
Ripples/noises (10 Hz to 1 MHz) rms Note 2) 10 mA | 10 mArms | 10 mArms 10 mArms
Remote control resistance/voltage
Protection
Operation
Temperature detection
Overvoltage protection level (standard value)
Meter and indications
Voltmeter (class 2.5) F.S
Ammeter (class 2.5) F.S
Voltage at digital display (Auto range)
D type
Current at digital display (Fix. range)
approx. O to 10 kQ/O to 10 V
turns off power switch
100°C
15 to 110% of rated output voltage
; 19.99 V, 199.9 V (FS) two ranges
+(0.1% rdg+1 digit) 23°C +5°C; Less than 80% RH
99.9 A (FS), +(0.5%rdg+ 1 digit) 23°C +5°C, Less than 80% RH
Indication of constant voltage operation
CV green LED lights
Indication of constant current operation
CC red LED lights
Indication of output
OUTPUT red LED fights when turned on
Function
Output switch
Turns on and off output
(preset voltage indicated with meter during off time)
Voltage/current check switch Preset voltage and current indicated with meters during on time
Overvoltage preset (OVP)
Indicates the over voltage protection level on the voltmeter during on time
Remote sensing
Via the rear panel senser terminal
Series control
Master/slave control
Parallel control Master/slave control |
Operating conditions
Temperature 0°C to 40°C
Humidity Less than 80%
Cooling Fan
Output polarity
Plus. or minus
Withstand voltage to ground
}—+-_ |__|
+ 250VDC

SPECIFICATIONS
[
Model
PD
i
8-20
(D}
|
*
8.30
(D)
|
18-20
(D}
|
18-30
(D)
35-20
(D)
Insulation
resistance
Chassis-input
line
30
MQ
or
more
at
500
VDC
Chassis-output
tine
20
MQ
or
more
at
500
VDC
Power
supply
]
Input
voltage
100/120/220/240
VAC
+10%,
1
¢
selectable
internally
Approx. 420 W Approx. 590 W Approx. 620 W Approx. 930 W Approx. 1 kW
Power consumption (at AC 100) [{~—__—_——}
Approx. 670 VA | Approx. 960 VA | Approx. 1 kVA |Approx. 1.4 kVA | Approx. 1.6 kVA
Dimensions and weight
{W) 208 208 a 208 208 208
Enciosure dimensions (H) 147 147 147 147 147 j
(D) 348 457 420 457 420
r =:
(Ww) 208 208 208 zi 208 208
{
Maximum dimensions ({H) 168 168 168 168 168
({D} 410 519 482 | 519 482
Weight Approx. 15 kg Approx. 20 kg Approx. 19 kg Approx. 24 kg Approx. 23 kg
Accessories
Instruction manual 1 1 1 1
Se
100 V, 120 V area 2-core cabtyre cable (3 m)
Input power cord (3-core cabtyre cable, 3 m)
220 V, 240 V area 3-core AC cable (2 m)
100 V, 120 V area 1AXx2 15 Ax2 15 Ax2 20Ax2
Note: 1. Measured via the sensing terminal.
2. Measured with plus or minus grounded.
Rack adaptor RK-601 (U4 of EIA standards) is optionally
available.
B® Circuit and ratings are subject to change without notice due to developments in technology.
20Ax2

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