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Belt type
Pulley type
SPZ
SPA
SPB
Changing the working diameter of a variable pulley:
1. Decrease the belt tension.
2. Open the over the disk circumference distributed screws (position see Figure 128)
3. Twist the outer ring (the outer rings for pulleys with 2 slots) to the desired diameter, ob-
serve the limits as per Figure 125 and Figure 126.
4. Fix the Allen screws.
5. Tighten the belts (refer to chapter 9.2.4 (Re-tensioning of belts)).
Figure 127: Schematic structures of a
variable pulley
After a change of the transmission ratio, must be controlled in each case, the current con-
sumption of the motor. If the consumption is too high, the effective diameter has to be ad-
justed again. The nominal current shown on the nameplate must not be exceeded.
Min. working di-
ameter [mm]
RST 84
RST 95
RST 100
RST 108
RST 108
RST 120
RST 129
RST 139
RST 146
RST 156
RST 164
RST 177
RST 187
RST 156
RST 164
RST 178
RST 187
RST 200
RST 250
Table 7: Data of pulley types
H max.
[mm]
62
9
73
9
78
9
90
7
76
13
88
13
97
13
109
12
116
12
126
12
134
12
149
11
159
11
117
19
125
19
139
19
148
19
161
19
211
19
Figure 128: Position of the Allen
screws on variable pulleys
Max. working di-
ameter [mm]
80
91
96
104
102
114
123
133
140
150
158
171
181
149
157
171
180
193
243
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