Lakeshore 331S - Relays; Relay Settings

Lake Shore Model 331 Temperature Controller User’s Manual
4.15.2 Relays (331S Only)
There are two relays on the Model 331S numbered 1 and 2. They are most commonly thought of as
alarm relays, but may be manually controlled also. Relay assignments are configurable as shown in
Figure 4-6.Two relays can be used with one sensor input for independent high and low operation.
When using relays with alarm operation, set up alarms first. The relays are rated for 30 VDC and 5 A.
Their terminals are in the detachable terminal block on the Model 331S rear panel.
To configure Relay 1 press the Alarm key and press Enter until the following display appears.
Select With °®
Relay 1 A Alarm
Use the s or t key to cycle through the options for Relay 1: Off, On, A Alarm, or B Alarm. Press the
Enter key. If the relay is set to follow either the A or B Alarm, the following screen will appear.
Select With °®
Relay 1 High Alarm
Use the s or t key to cycle through the relay alarm functions: Low Alarm, High Alarm, and Both
Alarms. Press the
Enter key.
Configuration for Relay 2 is identical to Relay 1.
Relay 1Relay 1
OffOff
Manual Off
relay remains in
normal state
High
Alarm
Low
Alarm
Both
Alarms
OnOn
Manual On
relay remains in
active state
A AlarmA Alarm
Follows
Input
A
B AlarmB Alarm
Follows
Input
B
Relay SettingsRelay Settings
Relay 2Relay 2
OffOff
Manual Off
relay remains in
normal state
High
Alarm
Low
Alarm
Both
Alarms
OnOn
Manual On
relay remains in
active state
A AlarmA Alarm
Follows
Input
A
B AlarmB Alarm
Follows
Input
B
Off Manual Off. Relay remains in the normal state.
On Manual On. Relay remains in the active state.
A Alarm Relay will follow Input A alarms.
Both Alarms Relay active when either the High or Low Alarm is active.
Low Alarms Relay active only when the Low Alarm is active.
High Alarms Relay active only when the High Alarm is active.
B Alarm Relay will follow Input B alarms.
Both Alarms Relay active when either the High or Low Alarm is active.
Low Alarms Relay active only when the Low Alarm is active.
High Alarms Relay active only when the High Alarm is active.
Figure 4-6. Relay Settings
Operation 4-31