Ashcroft ATE-2, Operation And Maintenance Manual

Page: 76 / 84

74
SECTION 16 b. TROUBLE SHOOTING CONT. WILL NOT READ VOLTAGES ON ITS “0-33Vdc In”
INPUT JACK
Consult the suggested wiring diagrams in section 14j referring to
the proper voltage measurement setup
With the unit powered up ensure that the input voltage is selected
from the front keypad (refer to manual) by pressing the “mA/V”
key in the lower left hand corner of the key pad. Multiple presses
of the key will rotate through” Volts”, “mA”, and pressure only
(blank displayed in the middle of the LCD display). If voltage still
isn’t displayed when selected:
Remove the HHC from the external wiring system and connect
a DC voltage source (0-33 Volts DC Max) between the “0-33Vdc
In” jack (+) and the “COM” jack (-) located at the top of the unit.
Select “volts” using the front keypad “ma/V” key and monitor the
display. The input voltage should be displayed.
If the voltage source used is faulty you can use the 24 volt loop
supply of the HHC to check the input voltage jack. Ensure that the
loop supply is operational (only valid for non- I.S. units) _ connect
the “24Vdc Out” jack to the “0-33Vdc In” jack and read the voltage
on the display _ Note that the COM connection is not required
here as they share this connection internally to the PTE-2.
Note: The power supply of a non-intrinsically safe base unit exhibits
a leakage voltage of approximately 1 volt in the off condition. This
is normal.
If the voltage still cannot be read, consult the factory
WILL NOT READ CURRENT INPUT INTO THE
“0-22Ma In” JACK
Consult the manual’s circuit diagram section 14j, referring to the
proper current measurement setup
With the unit powered up ensure that the input current measure-
ment is selected from the keypad by pressing the “mA/V” key in
the lower left hand corner of the key pad. Multiple presses of
the key will rotate through” Volts”, “mA”, and pressure only (blank
displayed in the middle of the LCD display). If current still isn’t
displayed when selected:
Remove the HHC from the external system and connect an iso-
lated direct current source (0-22 mA Max) between the “0-22mA
In” jack (+) and the “COM” jack(-) located at the top of the unit.
Select “mA” using the keypad “mA/V” key and monitor the display.
The input current should be displayed, if the current is not dis-
played:
Using a precision voltage source input a 200mv signal (+) pos-
itive lead into the “0-22mA In” jack and the negative side of the
voltage source (-) to the “COM” jack. This will simulate a 20ma
signal. If the current still is not displayed consult the factory
WILL NOT DISPLAY PRESSURE MODULE DATA
Remove the module from the base unit and then re-install the
module making sure it is fully seated in its base unit cavity. The
modules are hot swappable and upon reinsertion the pressure
should be displayed after the units re-booting process. If no pres-
sure value is displayed:
Turn off power to the HHC by pressing the green power key.
Remove the pressure module in question. Look into the vacated
module cavity in the base unit and inspect the interface con-
nector pins inside the cavity. Ensure that none of the connector
pins are bent or damaged. In the unlikely event one or more of
the pins are bent, carefully straighten the pin(s) then re- insert
the module making sure that the locking tab is fully seated in its
mating hole at the bottom of the base unit. Turn the base unit
back on, pressure should be displayed after the units booting pro-
cess. If pressure is not displayed, try another pressure module if