Re: Kaiser LS-1000 Capacitor Charging Power Supply

How sure are you that the supply was actually good?

It sounds like you've done everything correctly.

A ticking in a switchmode power supply may indicate a undercurrent or
overcurrent or short fault.

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"rhill100@xxxxxxxxxxxxx" <rhill100@xxxxxxxxxxxxx> writes:

Hi everyone,

I recently purchased a (new, old stock) Kaiser Systems LS-1000 1.5kv
power supply on eBay and am having trouble getting it up and running
to charge my yag flash capacitor. The interface is via a DB-15 and
the pin out is listed below. In manual a short checklist is provided
on the minimum signals that are required to operate the power supply
(further below with specifics of what I did to accomplish each step).
It looks pretty straight forward to me but I have been wrong before.

One point of confusion I have is with the indicator (pins) I want to
connect LEDs to. If the signal is pulled to ground when the LED should
be on would that imply that the other leg would be hard wired to a
positive DC source. Initial thoughts lead me to think that the LED
would light when the the negative side is 'pulled to ground' however
this is not the case. I really need to get these indicators working
so I can see whats going on while I'm trying to power it up.

No where in the manual have I seen anything defining the input range
for the voltage program pin 5. If using the 12v reference it has to be
12 or below. Right?

I have to be shooting myself in the foot somewhere in this process I
just can't tell what I'm doing wrong.

DB-15 PIN Out

pin 1 - Inhibit - The high voltage (HV) output is inhibited when pin 1
is at +12v or open circuited, it is enabled when pin 1 is pulled to
ground.

Connect pin 1 to ground.

pin 2 - Load fault indicator - Pulled to ground when the unit can not
charge the output capacitor to the requested voltage within a
reasonable time period. The high voltage output is disabled.

Output that could probably drive an LED connected to +12 via 1K resistor.

pin 3 - Temperature fault indicator - Pulled to ground when the
internal temperature exceeds a safe operating level. The high voltage
output is disabled.

Output that could probably drive an LED connected to +12 via 1K resistor.

pin 4 - Interlock Fault indicator - Pulled to ground when the external
interlock is violated. High voltage output is disabled.

Output that could probably drive an LED connected to +12 via 1K resistor.

pin 5 - Voltage program - A positive dc voltage applied to pin 5
controls the output voltage set point. Input resistance >= 200 kohms.

Input 0 to 12 V.

pin 6 - Over voltage fault indicator - Pulled to ground when the
maximum output voltage exceeds a safe operating level, the unit is
disabled when this occurs.

Output that could probably drive an LED connected to +12 via 1K resistor.

pins 7,8 - Voltage monitor - The voltage at pin 8 is a buffered signal
proportional to the instantaneous output. Drive capability: 10 V at
1.5 mA.

Output proportional to available current??

pins 9,11,12 - +12 V Control reference - Pin 9, 11, and 12 provide 12
Vdc that may be used with an external potentiometer for supplying a
voltage program signal to pin 5. No load regulation:
1% typical. Output resistance: 10 Ohms. Max output current: 50 mA.

Pin 10 - External interlock - Pin 10 is provided for use with an
external mechanical contact to prevent inadvertent supply operation
when end user access doors are open. Short pin 10 to ground return
pin 15 to allow operation.

Ground to enable.

Pin 13 - End of charge indicator - Pin 13 is pulled to ground when the
output voltage is equal to or greater than the program voltage.

Output that could probably drive an LED connected to +12 via 1K resistor.

Pin 14 - Unused

Pin 15 - Ground - Pin 15 connects to the circuit ground of all
internal circuitry and is internally tied to chassis ground. The
return signal connection for all interface connector pins (1 - 13)
should be made to pin 15.

Ground.

Minimum Steps To Operate



The minimum signals required to operate are inhibit, voltage program,
and external interlock.

Step 1: Inhibit the power supply by applying either a high impedance
(such as an open collector driver in the off state) or a +12V signal
to the inhibit pin.

I have used a 12v, 300mA variable wall transformer connecting its
ground to pin 15 and the +12 to pin 1. I have no idea if this is a
valid way to do this however.

Step 2: Apply AC to the power supply (110v).

There are signs of life because the fans spin up.

Step 3: Set the desired output voltage by applying a dc voltage to the
voltage program pin 5.

I used the 12v reference signal on pin 9 and a Radio Shack cermet
potentiometer (271-0342) to sweep back and forth across 0 - 12v with
no change in the power supply HV output. (which is showing an output
voltage of 24.29v on my multimeter when powered on regardless of the
pin settings). One thing I did notice is that when all of the pins are
set correctly and the supply should be operating, when I am the pin 5
input voltage I hear a slight ticking sound within the
somewhere. If I power it down then back up (not changing the pin 5
voltage) the ticking is not present.

Step 4: Close the external interlock by shorting pin 10 to 15.

Step 5: Enable the high voltage output by pulling the inhibit line,
pin 1, to the correct logic level.

Previously in the manual it was stated that taking pin 1 to ground
will enable the power supply.


If anyone can offer any advice at all it will be greatly appreciated.
.

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