fann MACS II, User Manual, Page: 105 / 165

MACS II User Manual
101796668 Revision E 96
Item Problem Cause Solution
5. After selecting Connect unit
goes into yellow Safe mode.
Emergency stop
button is pressed.
Twist emergency
stop button
counterclockwise,
disconnect, and re-
connect to initialize
the torque sensor.
6. Yellow Safe mode indication
during test.
Emergency stop
button has been
pressed.
Twist emergency
stop button
counterclockwise. If
a test has been
started, abort it and
start a new test.
There is no recovery
from this situation.
7. MACS II does not hold
pressure at low values <3000
psig but holds at high
values>8000 psig.
Bad Tescom valve
seat.
Rebuild Tescom
valve with Soft
Goods Kit (P/N
101629340).
8. MACS II holds pressure at low
values <3000 psig but does
not hold at high values>8000
psig.
Bad Tescom valve
stem and seat.
Rebuild Tescom
valve with Repair Kit
(P/N 101629342).
9. MACS II does not hold any
pressure but does pump.
No water supply. Turn on water.
Bad Tescom valve. Rebuild Tescom
valve with Repair Kit
(P/N 101629342).
Leaking cell or mag
drive o-ring.
Replace o-ring.
Leaking dump or
manual valve.
Replace dump valve,
tighten, and/or
replace manual
valve.
Leaking high
pressure fittings.
Look for leak,
tighten or replace.
High pressure is present. Before manual disassembly,
remove pressure by opening the manual valve or, as a last
resort slowly loosen a high pressure ¼ inch fitting ensuring
the temperature is below 100°F. Use proper PPE for safety.