Page History

• What does "current delta is in range" mean?
  Current delta is defined as the difference between a BPU current measured before a unit is turned on and after a unit is turned on.
  For example, before the SIU is turned on, the BPU SIU feed will register 0.1A (don't ask why it's not zero). After the SIU is turned on, it will read 0.7A. The current delta for turning the SIU on is 0.6A.
  You can do the same for the DAQ feed for the PDU and GASU.

• How to issue LMAINFEEDON command?
  You should be able to issue the LMAINFEEDON command more than once (can you?) and you should be able to turn on primary GASU first followed by PDU0. These will be separate calls to LMAINFEEDON and you should read the BPU current on the DAQ feed before and after you turn each on and see that the difference is appropriate.
  Yes, PDU on is a separate command (to LMAINFEEDON)
  GASU on is also a separate command.

• Don't worry about LTC_init for now. LTC is undergoing some changes, so it doesn't pay to worry about it.

• What are the CAL and TKR bias voltages supposed to be set to upon power up? Should they be the same as the current values in the clean room? What is their nominal value?
  Looks like Rich gave you an answer to that.

• Testbed doesn't model CAL Baseplate temperatures. Why not?
• Testbed doesn't seem return valid values for TKR T1
  I'm hoping you have an answer from Owen on these?

• Does the ACDPowerOn Command enable the converters inside the GASU?
  Yes, it should.
  If so, why is there a separate step for enabling the converters?
  That's Rich's mistake. Just use ADCPowerOn.

• What is the nominal value for the bias voltage for the ACD?
  No clue

• What are the proper ranges for all of these values?
  Systems will provide, but they haven't yet.

No Format

So,

I

talked

to

James

about

how

the

MAINFEEDON

was

intended

to

be

used

by

FSW.

He

maintains

that

it

was

only

meant

to

be

issued

once,

and

that

issuing

it

a

second

time

might

make

LIM

complain.

In

addition,

he

and

Mike

talked

through

the

power-up

sequence

(with

regard

to

the

PDU

and

GASU)

a

long

time

ago

and

they

decided

that

there

was

no

additional

information

to

be

gained

by

turning

them

on

separately.

FSW's

intention

was

to

turn

PDU

and

GASU

on

simultaneously.

I

asked

Selim

to

implement

the

power

on

sequence

in

that

way:

PDU

and

GASU

on

simultaneously.

If

anyone

still

has

cold

feet

about

turning

these

two

things

on

at

once,

please

let

me

know.