R&M Materials Handling HOIST MONITORS User Manual
Page 31
R&M Materials Handling, Inc.
4501 Gateway Boulevard
Springfield, Ohio 45502
P.: (937) 328-5100
FAX: (937) 325-5319
31/105
R&M Materials Handling, Inc. reserves the right to alter or amend the above information without notice.
Relation between the hoist duty class and the primary monitoring items:
Hoist duty class
Class code
ISO
FEM
Starts [n]
Par. 1-1-2
Run time [hr.]
Par. 1-1-3
SWP / SRT3 [hr.]
Par. 2-13
SWP / SL3 [n]
Par. 2-17
3
M3
1Bm
480.000
3.200
400
10.000
4
M4
1Am
1.134.000
6.300
800
24.000
5
M5
2m
3.000.000
12.500
1.600
64.000
6
M6
3m
7.500.000
25.000
3.200
160.000
7
M7
4m
18.000.000
50.000
6.300
378.000
8
M8
5m
42.000.000
100.000
12.500
750.000
6.2.1 Starts counter
The Starts counter counts the number of instants the hoist is started. A start is counted when the run
command output (either hoisting or lowering) is activated, and the run feedback becomes active. If only
run command input is activated then a start is not counted.
The maximum allowed number of starts is directly related to the theoretical lifetime of the hoist. When the
Starts counter reaches the design limit value, an adequate overhaul must be performed. See the specific
actions from the hoist GO manual. The hoist-monitoring unit will not prevent running the hoist when the
Starts counter reaches the design limit value, but it will give a warning signal, indicating that safe usage
of the hoist is no longer guaranteed.
6.2.2 Run Time counter
The Run Time counter records the total amount of hours the hoist has been running, either upwards or
downwards.
The Run Time counter is not load dependent. The maximum allowed run time is directly related to the
theoretical lifetime of the hoist. When the Run Time counter reaches the design limit value, an adequate
overhaul must be performed. See the specific actions from the hoist GO manual. The hoist-monitoring
unit will not prevent operating the hoist when the Run Time counter reaches the design limit value, but it
will give a warning signal, indicating that safe usage of the hoist is no longer guaranteed.
6.2.3 Safe Working Period counter (SWP%)h
The theoretical lifetime of the hoist is presented as Safe Working Period (SWP). The SWP is based on a
calculation, including the running hours and the load in the equation. The hoist-monitoring unit displays
the SWP in percentage of the initial value. A new hoist is given a SWP value of 100%, which is in respect
to the initial SWP-hours value according to the hoist duty class. When the SWP counter reaches zero, a
general overhaul must be performed, after which the hoist shall be given a new SWP. See the specific
actions from the hoist GO manual. The hoist-monitoring unit will not prevent running the hoist when the
SWP reaches zero, but it will give a warning signal, indicating that safe usage of the hoist is no longer
guaranteed.
∑
+
=
+
∆
+
∆
=
1
1
3
1
.
3
n
i
i
i
i
n
load
nom
load
SR
ts
tf
SRT
∑
+
=
+
=
1
1
3
1
.
3
l
k
k
l
load
nom
load
SL
(
)
%
100
3
_
3
3
_
%
⋅
−
=
SRT
D
SRT
SRT
D
SWPRT
(
)
%
100
3
_
3
3
_
%
⋅
−
=
SL
D
SL
SL
D
SWPHC
SWP% = min {SWPRT%, SWPHC%}