Edwards nEXT 55, Инструкция по эксплуатации

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Length of power failure Control mode Behaviour of pump
Power is restored after the
rotational speed of the
pump decreases below
50% but before regenera-
tive power stops
Parallel or serial con-
trol mode, timer disa-
bled
Regenerative power keeps all output signals ac-
tive during the power failure. As the timer is dis-
abled, the motor controller will go to the fail
condition when the speed decreases below 50%
and will display flashing error code 0. When the
power is restored, the pump will not speed up
until the error is cleared. To clear the error, send
a stop command (parallel or serial, depend on
the control mode), send a start command to
speed up the pump to the designated speed.
Parallel or serial con-
trol mode, timer ena-
bled
Regenerative power keeps all output signals ac-
tive during the power failure. If power is re-
stored before the timer period expires, the
pump will speed up to designated speed. If the
timer period expires, the motor controller will go
into fail condition and will display flashing error
code 3. When the power is restored, the pump
will not speed up until the error is cleared. To
clear the error, send a stop command (parallel or
serial, depend on the control mode), send a start
command to speed up the pump to the designa-
ted speed.
Power is restored after the
rotational speed of the
pump decreases below
50% and the regenerative
power stops
Parallel or serial con-
trol mode
Regenerative power stops and fails to keep out-
put signals. When power is restored, the pump
with parallel control will automatically restart if
the start control on the logic interface is set to
start. The pump with serial control requires a
new start command to speed up the pump to
the designated speed. The fail signals caused
during the regenerative power period are lost
when the power is restored.
6.9 Bakeout
If the pump (and the vacuum system) are heated, the degassing process will speed up
and the pump will reach ultimate vacuum in the shortest possible time. Heating the
pump will also prevent condensation of vapours inside the pump.
WARNING: HOT SURFACE
Risk of burn. Do not touch the flange heater or surrounding surfaces during the
bakeout process as they will be hot.
CAUTION: BAKEOUT PROCESS
Risk of damage to equipment. Pumps with ISO flanges are not suitable for bakeout,
only pumps with CF flanges must be used. When baking the pump to above 70 °C at
the inlet flange, the pump must be water cooled to prevent damage to the bearing
lubricant.
07/2021 - ©Edwards Limited Page 84 B8G000880_E
B8G000880_E - Operation