Edwards nEXT85 User Manual

Table 10
Behaviour of a pump when the power is re-instated aer an electrical supply
failure
Length of power
failure
Control
mode
Behaviour of pump
Power is reinstated
before pump
rotaonal speed
falls below 50%
Either
parallel or
serial
control
mode
Regenerave power maintains all output signals during the
power failure. The pump will ramp to its designated speed
as quickly as possible aer the power has been restored.
Power is reinstated
aer pump
rotaonal speed
falls below 50% but
before
regenerave power
ceases
Either
parallel or
serial
control
mode,
mer
disabled
Regenerave power maintains all output signals during the
power failure. As the mer is disabled, the motor controller
will go into fail condion as soon as speed falls below 50%
and will display ashing error code 0. When the power is
reinstated, the pump will not ramp up
unl the error is
cleared. To clear the error, send a stop command (either
parallel or serial, depending on the control mode), then
send a start command to ramp the pump up to the
designated speed.
Either
parallel or
serial
control
mode,
mer
enabled
Regenerave power maintains all output signals during the
power failure. If power is reinstated before the mer period
expires, the pump will ramp up to its designated speed as
quickly as possible. If the mer period expires, the motor
controller will go into fail
condion and will display ashing
error code 3. As above, when the power is reinstated, the
pump will not ramp up unl the error is cleared. To clear
the error, send a stop command (either parallel or serial,
depending on the control mode), then send a start
command to ramp the pump up to the designated speed.
Power is reinstated
aer pump
rotaonal speed
falls below 50%
and the
regenerave power
ceases
Either
parallel or
serial
control
mode
Regenerave power ceases and fails to maintain output
signals. When power is reinstated, the pump with parallel
control will automacally restart if the start control on the
logic interface is set to start. The pump with serial control
will require a new start command to ramp the pump up to
the designated speed. Any fail signals that were triggered
during the
regenerave power period are lost when the
power is reinstated.
Bakeout
If the pump (and the vacuum system) are heated, the degassing process will speed up and the
pump will reach
ulmate vacuum in the shortest possible me. Heang the pump will also
prevent condensaon of vapours inside the pump.
WARNING:
Do not touch the bakeout band or surrounding surfaces during the bakeout process as
they will be hot.
B8G0-00-880A - Operaon of the nEXT85
Page 56

Edwards nEXT85 Specifications

General

Brand	Edwards
Model	nEXT85
Category	Water Pump
Language	English