Watlow Series 96 - Manual (Page 27)

Wa t l o w S e r i e s 9 6 F e a t u r e s ■ 5 . 8
Burst Fire
Burst firing provides even output power with the
lowest level of noise generation (RFI). Burst fire is
the preferred method for controlling a resistive load,
providing a very short time base for longer heater
life.
The controller determines when the ac sine wave
will cross the 0-volts point, then switches the load
on or off only at this point, minimizing RFI.
The burst fire feature for Output 1 can be turned on
or off with Burst Fire 1 [brS1] (PID 1 Menu). The
burst fire feature for Output 1 requires either
switched dc (96_ _-C _ _ _ -_ _ _ _) or solid-state
relay (96_ _-K _ _ _ -_ _ _ _).
The burst fire feature for Output 2 can be turned on
or off with Burst Fire 2 [brS2] (PID 2 Menu). The
burst fire feature for Output 2 requires either
switched dc (96_ _-_ C _ _ -_ _ _ _) or solid-state
relay (96_ _- _ K _ _ -_ _ _ _).
Figure 5.8a Burst fire.
66 percent output
2 ON, 1 OFF
10 percent output
1 ON, 9 OFF
50 percent output
1 ON, 1 OFF
100 percent output
10 ON, 0 OFF
Ramp to Set Point
Ramping protects materials and systems that cannot
tolerate rapid temperature changes. The value of the
ramp rate is the maximum degrees per minute or
hour that the system temperature can change.
Select when ramping is active with Ramping Mode
[``rP] (Global Menu).
[`OFF] ramping not active.
[Strt] ramp at startup.
[StPt] ramp at startup or when the set point
changes.
Select whether the rate is in degrees per minute or
hour with Ramp Scale [rP`S] (Global Menu). Set
the ramping rate with Ramp Rate [rAtE] (Global
Menu).
Figure 5.8b Ramping to set point.
Set Point
Time
Temperature
Temperature ramps to Set Point at a set rate
degrees
per minute
Set Point
Time
Temperature
S
Temperature reaches Set Point quickly
Note: The Ramping Mode will not appear if the ramping
software option has been ordered (96XX-XXXX-AAXX).