ZVM LIMIT COMPARATOR Operating Instructions
Contents
1. 2 672005 E mail Service Vermason co uk Internet Vermason co uk TB 7564 Page 2 of 2 2014 Vermason2. E THAT THE ZERO VOLT MONITOR OPERATOR LIMIT COMPARATOR IS USED TO INSTALLING OPTIONAL LOW AND HIGH LIMIT CHECK ONE OPERATOR AT A TIME RESISTANCES 3 Ensure that the Zero Volt Monitor to be checked is A Use a hex wrench to remove the rotary switch set up as described in the operating instructions and knob Unscrew the 2 screws on the back of the unit has power and disassemble the unit 4 Connect the plug from the limit comparator into the B Two resistances must be installed for each OPERATOR 1 remote jack limit one for PASS and another for FAIL These two resistances should be 10 of the calibrating resistance For example UNIT C 4TH DIMENSION FOURTH AVENUE LETCHWORTH HERTS SG6 2TD UK Phone 0044 0 1462 672005 E mail Service Vermason co uk Internet Vermason co uk TB 7564 Page 1of2 January 2014 2014 Vermason LOW LIMIT FAIL LOW LOW LIMIT PASS RESISTANCE 1M 1M x 10 LOW LIMIT CALIBRATION RESISTANCE RESISTANCE 1M 1M x 10 1 Megohm 900Kilohms 1 1 Megohms HIGH LIMIT HIGH Limir HIGH LIMIT PASS RESISTANCE CALIBRATION 5M 15Megohms RESISTANCE 10 g 15Megohms i 15M x 10 15 Megohms 13 5 Megohms 16 5 Megohms C The table below specifies which numbered resistances on the circuit board correspond to the optional low limit and the optional high limit Solder the appropriate resistors in these places FAIL HIGH RESISTANCE D Assemble the unit and mark the appropriate
3. Vermason TECHNICAL BULLETIN TB 7564 Made in the United States of America ZVM LIMIT COMPARATOR MN Operating Instructions be 5 Turn the rotary knob on the Limit Comparator to x Ohms LOW select x 1 91 Megohms or the optional low limit fail low according to what operator low limit the Zero Volt Monitor is calibrated Observe the operator 1 LED display on the front of the Zero Volt Monitor The yellow LED should be on and the audible alarm should sound indicating the fail low condition 6 Turn the rotary knob on the Limit Comparator to x Ohms PASS select x 1 91 Megohms or the optional low limit pass safe according to what operator low limit the Zero Volt Monitor is calibrated The green LED on the Zero Volt Monitor operator 1 display should be on indicating the low limit pass safe condition ani 7 Turn the rotary knob on the Limit Comparator to x Figure 1 Vermason 222770 ZVM Limit Comparator Ohms PASS select x 10 Megohms 35 Megohms or the optional high limit pass safe according to 1 The purpose of the ZVM Limit Comparator is to verify the calibration of the 222755 Zero Volt Monitor by checking ils ed eT aca sitar four operator conditions FAIL LOW PASS low limit operator 1 display should be on indicating the high PASS high limit and FAIL HIGH limit pass condition i 2 There are 10 resistor settings on the Limit Comparator 8 Turn the rotary knob on the Limit Comparator t
4. at 0044 0 1462 672005 for a Return Material Authorization RMA and proper shipping instructions and address Please include a copy of your original packing slip invoice or other proof of date of purchase Any unit under warranty should be shipped prepaid to the Vermason factory Warranty replacements will take approximately two weeks If your unit is out of warranty Vermason will quote repair charges necessary to bring your unit up to Vermason factory standards Call Customer Service at 0044 0 1462 672005 for proper shipping instructions and address Ship your unit freight prepaid Warranty Exclusions THE FOREGOING EXPRESS WARRANTY IS MADE IN LIEU OF ALL OTHER PRODUCT WARRANTIES EXPRESSED AND IMPLIED INCLUDING MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE WHICH ARE SPECIFICALLY DISCLAIMED The express warranty will not apply to defects or damage due to accidents neglect misuse alterations operator error or failure to properly maintain clean or repair products Limit of Liability In no event will Vermason or any seller be responsible or liable for any injury loss or damage direct or consequential arising out of the use of or the inability to use the product Before using users shall determine the suitability of the product for their intended use and users assume all risk and liability whatsoever in connection therewith UNIT C 4TH DIMENSION FOURTH AVENUE LETCHWORTH HERTS SG6 2TD UK Phone 0044 0 146
5. o x which can be set using the rotary switch Positions 3 ohms HIGH select x 10 Megohms 35 Megohms through 8 have installed values Positions 1 2 9 and 10 or optional high limit fail high according to what can be installed by the user for one set each of custom operator high limit the Zero Volt Monitor or is low and high limits The standard settings are as follows calibrated The red LED on the Zero Volt Monitor operator 1 display should be on and the audible POSITION alarm should sound indicating the fail high condition 1 optional low limit fail low 9 Disconnect the Limit Comparator plug from the 2 optional low limit pass operator 1 remote jack Plug the Limit Comparator plug into the operator 2 remote jack and repeat the 3 1 91 Megohms FAIL LOW l four tests in steps 5 through 8 to test operator 2 4 1 91 Megohms PASS ZVM default settings 5 10 Megohms PASS 10 The correct color LEDs must light for each step for 6 10 Megohms FAIL HIGH the Zero Volt Monitor to completely pass the calibration check If an incorrect LED comes on 7 35 Megohms PASS during any portion of the test example expecting 8 35 Megohms FAIL HIGH the green LED to light in step 7 but the Zero Volt 9 optional high limit pass safe Monitor red LED is on recalibrate the Zero Volt 10 optional high limit fail high Monitor and test each operator again with the Zero Volt Monitor cal limit comparator PLEASE NOT
6. places on the label for the optional limits E It is recommended to turn the rotary switch to the optional positions and measure the resistance from the tip to the body of the plug with an ohmmeter to verify the resistances ammeter Figure 2 Optional low limit Designated resistors on circuit board Low limit fail low R1 R1A connected in series Low limit pass R2 R2A connected in series Optional high limit Designated resistors on circuit board High limit pass R9 R9A connected in series High limit fail high R10 R10A R10B connected in series NOTE Two three for position 10 resistor locations are connected in series are provided in case resistors need to be added to achieve the desired total resistance Solder a shorting wire across the resistor locations that are not used MAINTENANCE Wipe the plug periodically with alcohol Limited Warranty Vermason expressly warrants that for a period of one 1 year from the date of purchase Vermason Limit Comparators will be free of defects in material parts and workmanship labor Within the warranty period a credit for purchase of replacement Vermason products or at Vermason s option the product will be repaired or replaced free of charge If product credit is issued the amount will be calculated by multiplying the unused portion of the expected five year life times the original unit purchase price Call our Customer Service Department
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