Watlow Series 935B - Manual (Page 28)

28 Watlow Series 935B User’s Manual
To Set Up Series 935B Alarms…
1. Plan an alarm strategy. What do you
want to happen when an alarm occurs?
2. Wire the appropriate control output, Output 1 or Output 2, and associ-
ated switching and annunciators. See p. 44-45 for wiring information.
3. Go to the 935B’s Configuration Menu [CnFG] . See p. 18.
4. Set either Output 1 [`Ot1] or Output 2 [`Ot2] as the [ALM] output.
5. Set Alarm Type [ALty] .
6. Set alarm hysteresis [AhYS] .
7. Set alarm latching [`LAt] .
8. Set alarm silencing [`SIL] .
9. Set a failure mode [FAIL] . See p. 38-39.
10. Go to the 935B’s Operation Menu. See p.12.
11. Set the alarm high and low [`ALO] and [`AhI] points.
12. Test and adjust the alarm system.
13. Document the alarm settings and system.
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CAUTION: Verify, in Table 10, p. 27, the alarm state / alarm output
condition you want before making the Alarm Type
[ALty] choice.
Failure to do so could result in damage to equipment and property.
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WARNING: Do not rely on the Series 935B alarms to provide redundant
temperature limit control. Use correctly specified, properly installed
temperature limit controls instead. Failure to do so could result in
injury, death or damage to equipment and property. (See
accompanying Watlow Bulletin 89.4.3.)
To Clear a Series 935B Alarm…
In general, press the
ß key to clear a latched or ‘silence-able’ ( [`sil] =
[yes] ) alarm.
Ultimately, the system process value must return within the safe area for the
alarm to remain clear. Non-latching alarms self-clear.
Configuration Menu
[``In]
Input Type
[`C_F]
Celsius/Fahrenheit
[``rL]
Input Range Low
[``rh]
Input Range High
[`Ot1]
Output 1 Function
[`Ot2]
Output 2 Function
[`rts]
Remote Timer Start
[dISP]
Display Default
[AltY]
✓
Alarm Type
[AhYS]
✓
Alarm Hysteresis
[`LAt]
✓
Alarm Latch
[`SIL]
✓
Alarm Silencing
[FAIL]
Failure Mode
Operations Menu
[`Aut]
Auto-tune
[`ALO]
✓
Alarm Range Low
[`AhI]
✓
Alarm Range High
[`Pid]
PID
[CnFG]
Configuration
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Setting and Clearing Alarms