Watlow PC1X-F20, User Manual

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Baseline Voltage and
Voltage Compensation
The baseline voltage is used by the controller to
adjust the output so that the system power remains
constant. This adjustment is called voltage compen-
sation. The requested power is assumed to occur at
the baseline voltage. If there are any deviations of
the line voltage from the baseline voltage, the
applied output power will be adjusted.
For example, the starting line voltage of the system
is 121 volts and the baseline voltage is set to 121
volts. The requested power is set to 50.0 percent.
After the system has been controlling, the line volt-
age drops to 110 volts. During the time that the line
voltage is at 110 volts, the applied output power will
be adjusted to (121
2
/110
2
) x .50 = 60.5 percent so that
the system power remains constant.
The baseline voltage is also used for adjusting oper-
ating parameters in the software. It is important to
adjust the baseline voltage to the normal operating
voltage of the unit to enable it to operate at maxi-
mum accuracy.
Menu Lock
Menu locks allow a user to restrict access to parame-
ters. If a lock is set on a menu, the parameters
become read only. The system will not allow parame-
ter to be changed, either from the keypad or through
communications.
Factory Page:
• Enter the Factory Page by holding ± ¬ ® for 2
seconds.
• When the display reads [data] , press Î until [`loc]
[fcty] [fcty]
is displayed. Press ®
until
[`Unl] is displayed.
[glOC]
Use Global Lockout {gLOC} to write protect all
prompts by choosing locked [`LOC] . If set to un-
locked [`Unl] , individual menu locks can be set by
selecting each parameter in the Global/Menu Lock-
outs Menu and individually setting each to locked
[`LOC] or unlocked [`Unl] .
5 . 6
■
Wa t l o w P o w e r S e r i e s F e a t u r e s , C h a p t e r 5
Signal Selection
You need to configure the Power Series for current,
voltage or digital.
Setup Page:
• Enter the Setup Page by holding ± ¬ for 2 seconds.
• When the display reads [algo] , press Î until [CTr1]
[`set] [`set]
is displayed. Press ®
until
[`nna] is displayed.
[``In]
Use the Ó Î keys to select either current {`nnA] ,
volt {Uolt] , or digital [`dig] .
NOTE: Repeat this procedure for each zone that you wish to
configure.
Analog is typically 0-5V Î (dc), 1-5V Î (dc), 0-10V Î
(dc), 4-20mA.
Digital is used for keypad manual control or
communications to control the Power Series.
Digital input is entered from the keypad in the
Display Loop on the
[`1n1] , [`1n2] or [`1n3]
prompt.
Current inputs are hardware limited to 0 to 20mA,
but may be scaled using the
{nnA_] and {nnA–]
prompts. Note that the power will be fully off at the
current specified by prompt
{nnA_] +.2mA, and
fully on at the current specified by prompt {nnA–]
-.2mA.
Voltage inputs are hardware limited to 0 to 10V, but
may be scaled using the
{Uol_] and {Uol–]
prompts. Note that the power will be fully off at the
current specified by prompt
{Uol_] +.1V, and fully
on at the current specified by prompt {Uol–] -.1V.
Other Features
Input