IBM System/370 145 Reference Summary page 109

Action Result
Diagram Coordinate
7. K15 points (M4) Pick K16 M4
K16 is the con·
tactor that allows
the 208v input to
the motor generator.
This allows the
motor generator to
start. To start the
generator with no
load, a time delay of
15 seconds is acti·
vated. This is a
function of tome de·
lay relay K20. K20
received a pick from
K14 points at (H9),
but will not actually
transfer its points for
15 seconds. CONDI· KB
TION K20
8. K20 points (l6) Pick K21 K7
K21 provides a
hold for K16 (M3).
9. K21 points (J6) Pock K22 K6
K22 drops the time
delay relay K20 by
opening K22 points
at (F9)
10. K22 points (M4)
11. K28 points (G5) pick
K20 time delay for
second time. The
points of K20 will not
transfer for 15
seconds.
Pock K26
K28
K29
CONDI·
DITIQN K20
K26 points Pick K27
12. All first seq regs at Pick K31
60% K31 is picked
by
a multi-input com-
parator card that
ANDs voltage de-
tection from all
regulators.
13. K31 points start seq 2
regulators. When the
seq 2 regulators reach
60%, the voltage detect
circuit is satisfied.
Its output will . . . Pick K32
9.7
l4
400 Hz to Sys-
tem Starts Regs
l5
Heads Ext Ctrl
l4 AC Power to
3210
K9
(Not Shown) 400 Hz
to F ole Motors
and Blowers
J4 First Seq Complete
J3 Second Seq
Complete