Harrington Hoists and Cranes (N)ER Hoist - ((N)ER2) - Manual (Page 39)

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6.0 Maintenance and Handling
6.1 Count/Hour Meter
A count/hour function is included in all NER2/ER2 hoists. A Count/Hour Meter is included in the single speed
hoists and a count/hour function is one of the VFD parameters in the dual speed hoists.
6.1.1 Single Speed – The Count/Hour (C/H) Meter located on the electrical control panel records the hoist's
“ON” time and number of starts. To view these values, press the button on the C/H Meter one time.
The display will then show a total of 3 values. The first value will show an "H" and a 5 digit number
which is the hoist's total “ON” time (up and down) in hours (item “1” in Figure 6-1). After 3 seconds, the
display will automatically change to a 6 digit number which is the number of starts of the hoists “DOWN”
contactor, through 999,999 starts (item “2” in Figure 6-1). After 3 seconds, the display will automatically
change to a 4 digit number prefaced by a “C”. This is the number of hoist starts through 9,999,000,000
(item “3” in Figure 6-1).
The example in Figure 6-1 is as follows:
Item “1” – Operating Hours: 1,089 hours
Item “3” and “2” – Number of Starts: 2,031,091 starts
Figure 6-1 Count/Hour Meter
6.1.2 Contactor – The C/H Meter can be used in conjunction with the amount of jogging to estimate when the
contactor(s) should be replaced. Jogging is when the pendant control buttons are pressed quickly and
repetitively to move the hook in small increments. Refer to Table 6-1.
Table 6-1 Criteria for Recommended Contactor Replacement
Jogging During Normal Operation Change Contactor After:
(starts) Rating Approximate Jogging Frequency
Low Jogging is rare. 1,000,000
Medium During 25% of operations/lifts. 500,000
High During 50% or more of operations/lifts. 200,000