5.7 Shut down
WARNING:
When the pump has been switched off the fan will continue to run for 1 minute.
Use the procedure below to shut down the pump:
1.
If shutting the pump down prior to a period of storage, remove any process gases
by running on high flow gas ballast for at least one hour.
2.
Close any vacuum system isolation valve to prevent suck
‑
back into the vacuum
system (where fitted).
3.
Switch off the pump. (When the pump is switched off the fan will continue to run
for 1 minute).
4.
Vent the pump by the gas ballast control (if fitted) or valve on the inlet.
Figure 5 Logic interface schematic
1. Speed control pins 3, 4 and 5
Maximum current per pin = 7 mA when
linked to pin 1 (24 V)
2. Pump healthy signal
Signal high = normal (maximum
permissible current = 100 mA)
1. Speed control pins 3, 4 and 5
Maximum current per pin = 7 mA when
linked to pin 1 (24 V)
2. Pump healthy signal
Signal high = normal (maximum
permissible current = 100 mA)
Table 9
Pin status on the logic interface connector
Mode
Speed
percentage
Pumping speed
(m
3
h
-1
)
Pin 1
Pin 3
Pin 4
Pin 5
Normal
100%
35
24 V
Link
open
open
Boost
116%
41
24 V
Link
Link
Link
Idle
67%
23
24 V
Link
Link
open
The tolerance of the power supply can be ± 10%. Make sure all the unused pins are not
connected.
Page 25
A73001880_M - Operation
