MKS Granville-Phillips 358 series, Instruction Manual

Page: 36 / 122

Chapter 3
36
Series 358 Micro-Ion Controller Instruction Manual - 358013 - Rev. B
Process Control Tips
1. The process control override switches can be used to hold relays ON
or OFF during initial setup or during non-typical process conditions.
2. When the Micro-Ion gauge is OFF, channels 1 and 2 are inoperative.
3. When Convectron gauges are disconnected, channels 3 through 6 are
inoperative.
4. The status of relays 1 and 2 will not change during degas. The
controller pressure will remain at the reading when degas began.
5. Relay actuation occurs when the pressure indication differs from the
setpoint value by one display unit. A 10% hysteresis is automatically
programmed into each setpoint for returning pressures. Table 3-4
exemplifies this using a setpoint pressure of 6.3 x 10
-7
, and assuming
the polarity is set for falling pressure activation.
Table 3-3 Relay Polarity Switch Settings
Switch
Settings Channel
Activated Pressure Indication
Relative to Setpoint Switch
Settings Channel
Activated Pressure Indication
Relative to Setpoint
6 Below (factory setting) 3 Below (factory setting)
6 Above 3 Above
5 Below (factory setting) 2 Below (factory setting)
5 Above 2 Above
4 Below (factory setting) 1 Below (factory setting)
4 Above 1 Above
1
OFF
4
OFF
1
ON
4
ON
2
OFF
5
OFF
2
ON
5
ON
3
OFF
6
OFF
3
ON
6
ON