Watlow F4T User Manual

Watlow F4T • 100 • Chapter 5 Function Reference
Input Error Power
Select how the Open Loop Set Point is set when the loop’s control mode switches from auto
to manual due to an input error.
Options:
• Off: Manual Power is set to 0%
• Bumpless Transfer: Manual Power is set equal to the last calculated value as long as
the output was less than 75% and stable. Stable is defined as varying by no more than
±5% over the Integral setting or a minimum of 10 seconds. Otherwise, Manual Power is
set to 0%
• Fixed Power: Manual Power is set equal to the Fixed Power setting
• User: uses the current Manual Power setting
Fixed Power
Set the power level corresponding to the Fixed Power option for the Auto-to-Manual Power
and Input Error Power parameters.
Range: Minimum Power to Maximum Power
Open Loop Detect Enable
Enable or disable the open-loop detect feature. When enabled, this feature monitors closed-
loop control for the appropriate process value response to the output signal. If the loop does
not respond as expected, the control mode is set to off.
Options:
• No: open loop detect is not enabled
• Yes: open loop detect is enabled
Open Loop Detect Time
Set a delay in seconds to the open loop error. If Open Loop Detect Enable is Yes and the
process value deviates from the set point by the Open Loop Detect Deviation value for this
amount of time, an open-loop error occurs and the control mode is set to off.
Range: 0 to 9,999 seconds
Open Loop Detect Deviation
Set the minimum difference between set point and process value that is considered excessive
by the open loop detection feature. If the process deviates by this amount or more for the
Open Loop Detect Time, an open loop error occurs and the control mode is set to off.
Range: -99,999 to 99,999 ºF or units
-55,555 to 55,555 ºC
Manual Active Level
Choose the signal value at the MAN receiver which switches the loop's Control Mode to Manu-
al.
Options:
• High: the Control Mode is set to Manual when the signal is on
• Low: the Control Mode is set to Manual when the signal is off

Watlow F4T Specifications

General

Inputs	Thermocouple, RTD, mA, V
Outputs	Relay, SSR, mA, V
Communication	Ethernet, Modbus RTU
Data Logging	Yes
Certifications	CE, UL, cUL, RoHS
Control Modes	PID, On/Off
Power Supply	100 to 240 VAC
Operating Temperature	0 to 50°C
Enclosure Rating	IP65
Display	4.3 in. (109 mm) color touch panel LCD
Control Loops	Up to 4