Watlow Series F4S/D - Manual (Page 70)

6 . 6 ■ F e a t u r e s Wa t l o w S e r i e s F 4 S / D
Multiple PID Sets
The Series F4 has five PID sets available for each
channel, sets 1 to 5 for Channel 1 and sets 6 to 10
for Channel 2, allowing optimal performance under
different conditions, loads and temperatures. In the
Static Set Point mode, PID Set 1 is used for Chan-
nel 1 and PID Set 6 is used for Channel 2 control.
When programming a profile, you can assign differ-
ent sets to each Ramp step and Soak step.
A PID set includes proportional, integral and
derivative settings for outputs A and B. It also in-
cludes dead band, as long as the proportional band
is not set to 0.
Location in software: Operations Page > Edit PID >
PID Set Channel x (1 or 2) > PID Set x (1 to 5) or
(6 to 10).
Channel 1 (Heat/Cool)
Output 1A Heat
Output 1B Cool
PID Sets 1 to 5
PropBand A
Integral A
Derivative A
Dead Band A
PropBand B
Integral B
Derivative B
Dead Band B
Channel 2 (Relative
Humidity)
Output 2A Humidify
Output 2B Dehumidify
PID Sets 6 to 10
PropBand A
Integral A
Derivative A
Dead Band A
PropBand B
Integral B
Derivative B
Dead Band B
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.
Location in software: Setup Page > Control Output
x (1 to 3).
Figure 6.6 — Burst Fire.
66% output
2 ON, 1 OFF
50% output
1 ON, 1 OFF
100% output
10 ON, 0 OFF