TB-6542
Page 3 of 5
Revision 10/04
5. Turn the rotary knob on the resistor box to “x
Ω
LOW” (select x = 1.91M
Ω
or the
optional low limit fail low, according to what operator low limit the ZVM is
calibrated at). Observe the operator 1 LED display on the front of the ZVM. The
yellow LED should be lighted and the audible alarm should sound, indicating the
fail low condition.
6. Turn the rotary knob on the resistor box to “x
Ω
SAFE” (select x = 1.91M
Ω
or the
optional low limit pass safe, according to what operator low limit the ZVM is
calibrated at). The green LED on the ZVM operator 1 display should be on,
indicating the low limit pass safe condition.
7. Turn the rotary knob on the resistor box to “x M
Ω
SAFE” (select x = 10M
Ω
, 35M
Ω
or the optional high limit pass safe, according to what operator high limit the ZVM
is calibrated at). The green LED on the ZVM operator 1 display should be on,
indicating the high limit pass safe condition.
8. Turn the rotary knob on the resistor box to “x M
Ω
HIGH” (select x = 10M
Ω
,
35M
Ω
or optional high limit fail high, according to what operator high limit the
ZVM or is calibrated at). The red LED on the ZVM operator 1 display should be
on and the audible alarm should sound, indicating the fail high condition.
9. Disconnect the resistor box plug from the operator 1 remote jack. Plug the
resistor box plug into the operator 2 remote jack and repeat the four tests in
steps 5 through 8 to test operator 2.
10. The correct color LED's must light for each step for the ZVM to completely pass
the calibration check. If an incorrect LED comes on during any portion of the test
(example: expecting the green LED to light in step 7 but the ZVM red LED is on)
recalibrate the ZVM with the ZVM-PRG (making certain that the correct
calibration resistances are installed in the ZVM-PRG and the correct procedures
are followed for that unit) and test each operator again with the EN445-ZVM cal
check resistor box.
INSTALLING OPTIONAL LOW AND HIGH LIMIT RESISTANCES
A.) Use a hex wrench to remove the rotary switch knob. Unscrew the 2 screws on the
back of the unit and disassemble the unit.
B.) Two resistances must be installed for each limit: one for PASS SAFE and another
for FAIL. These two resistances should be ±10% of the calibrating resistance. For
example:
