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18
WATLOW Series 733/734 Service Manual
Service Mode, Chapter 3
Service
Display alternates
between parameter and
programmed data.
0
AUt1
AUt2
0
Pb1
25
rE1
0.00
rA1
0.00
Ct1
5
Pb2
25
rE2
0.00
0.00
rA2
Service Parameters
Auto-tune Zone 1: Initiates auto-tune for Zone 1. For more information on tuning,
see Chapter 4, Page 19.
Range: 0 = off, 1 = slow, 2 = medium, 3 = fast Default: 0
Auto-tune Zone 2: Initiates auto-tune for Zone 2. For more information on tuning,
see Chapter 4, Page 19.
Range: 0 = off, 1 = slow, 2 = medium, 3 = fast Default: 0
Proportional Band 1: A proportional band expressed in degrees F or C, within
which a controller proportioning function is active for Zone 1. When Pb1 = 0, it
functions as an ON/OFF control. The switching differential is then determined by
the HYS1 parameter in the Setup mode. See Page 15.
Range: 0 to 999°F/0 to 555°C Default: 25°F
Reset 1: A reset (integral) control action for Zone 1 automatically eliminates offset,
or "droop," between set point and actual process temperature in a proportional
control. This parameter only appears if Pb1 0.
Range: 0.00 to 9.99 repeats/minute Default: 0.00
Rate 1: The rate (derivative) function for Zone 1 which affects the speed or rate at
which the process temperature approaches the set point to minimize overshoot
and/or undershoot. The rate is determined by how fast the error is changing. This
parameter only appears if Pb1 0.
Range: 0.00 to 9.99 minutes Default: 0.00
Cycle Time 1: Expressed in seconds, time for a controller to complete one ON/
OFF cycle for Zone 1. Time between successive turn ons. This parameter only
appears if Pb1 0.
Range: 1 to 60 seconds Default: 5
Proportional Band 2: A proportional band expressed in degrees or process units,
within which a controller proportioning function is active for Zone 2. When Pb2 = 0,
it functions as an ON/OFF control. The switching differential is then determined by
the HYS2 parameter. This parameter only appears if you have a dual zone control.
Range: 0 to 999°F/0 to 555°C/0 to 999 units Default: 25°F
Reset 2: A reset (integral) control action for Zone 2 automatically eliminates offset,
or "droop," between set point and actual process temperature in a proportional
control. This parameter only appears if your unit has a secondary output and Pb2
0.
Range: 0.00 to 9.99 repeats/minute Default: 0.00
Rate 2: The rate (derivative) function for Zone 2 which affects the speed or rate at
which the process temperature approaches the set point to minimize overshoot
and/or undershoot. The rate is determined by how fast the error is changing. This
parameter only appears if your unit has a secondary output and Pb2 0.
Range: 0.00 to 9.99 minutes Default: 0.00