Watlow Series 935A - Manual (Page 28)

2 6 Watlow Series 935A User’s Manual
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 associated switching and annuncia-
tors. See p. 42-45 for wiring information.
3. Go to the 935A’s Configuration Menu [CnFG] . See p. 16.
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. 36-37.
10. Go to the 935A’s Operation Menu. See p.10.
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. 25, 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 935A 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 935A 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
[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
Setting Alarms