VersaPro Temperature Controller
Page 58
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18.3 Digital Communications
How come I have communications problems with an instrument address following a Versapro address
setting.
If the timer function has been enabled and the Versapro host protocol is set to ‘Prop’ for the Marathon protocol,
the instrument will take the next host address setting to respond with the timer parameters. The problem can
be corrected by turning of the timer function in the Control menu or setting to next instrument address to
Versapro host a 2.
18.4 Display
Functions
How come the display flashes HHHH or LLLL when I try to read a signal at input A or input B in linear
mode?
There are possibly two reasons; the decimal point setting in the Calc menu has to be adjusted for the
maximum signal level to be read or the signal level has exceeded the range of the input channel. Channel A is
set up primarily for thermocouple levels from –10mV to 70mV. Channel B is set up for oxygen sensor millivolt
ranges of 0 to 2000 mV. The display decimal point setting will not truncate the input value. If the value is
within the input range of the channel but greater than or less than the possible display setting then the limit
warnings will flash on the display.
How come I can’t see the linear reading on my controller / monitor?
It is necessary to change the decimal point in the Calc setup menu.
How come the process values will not cycle on the display when I press the Enter key?
The display will not cycle through the process values if there is an active alarm. Press the Enter key to see
any active alarms. If multiple alarms are active it will be necessary to press the UP or DOWN keys until all of
the alarms have been displayed. It is necessary to clear these alarms before the display will cycle by pressing
the Enter key.
18.5 Timer
Function
How come I cannot enter a timer setpoint.
Two things have to be set for the timer to work; the timer has to be enabled in the Control Menu, and a timer
alarm function has to be selected for alarm 1 or alarm 2 but not both alarms at the same time. Only when
these conditions have been met will the instrument accept a timer setpoint.
How come I cannot start a timer function when the Input Event is set to Start and activated?
Make sure all of the conditions explained in the first question of this time section have been met.
Why is there a delay between the Timer display changing to zero and the End alarm coming on?
The timer is counting in milliseconds but only displays whole seconds. When the display first changes from 1
to 0 it actually changes to 0.99. It continues to count down for the remaining milliseconds until the timer
reaches zero at which point it turns on the End alarm.
