t
b
a=
11
t
d
d1
d2
a
19
Swiss Lifting Solutions
Figure 3-1
Figure 3-2
Designation
GPM/GP 250
GP 500
GP 1000
GP 1600
GP 2500
Chain type d x t
[mm]
3.75 x 10.75
5.25 x 15
7.45 x 23
9.4 x 27.4
11.75 x 32.9
Limit values according to
DIN 685, part 5, DIN EN 818-7
1. Measurement over 11 chain links, a = 11t
[mm]
120.6
168.3
258.1
307.4
369.1
2. Measurement over 1 chain link, 1t
[mm]
11.3
15.7
24.1
28.7
34.5
3. Measurement of the chain link diameter
dm = d1 + d2 / 2 (dm min. = 0.9 x d)
[mm]
3.4
4.7
6.7
8.5
10.6
Table 3-4 Load chain wear values
3.2.4 Load chain
The load chain should be periodically checked for abrasion. The check is based on three measurements: see permissible wear values
(table 3-4) and measuring points (figure 3-2).
The chain should be replaced when the measurements no longer comply with those defined in the table. The chain wheel
and chain guidance should be checked for wear at the same time and, where necessary, be replaced. Only use original
chains. The chain links should not be welded.
The new chain is installed in accordance with chapter 2.2.2.
For ease of installation, the old chain and new chain can be connected by a piece of flexible wire.
Designation
GPM/GP 250
GP 500
GP 1000
GP 1600/2500
Nominal value air gap (a)
[mm]
0.3 (+0.1 / -0.05)
0.3 (+0.1 / -0.05)
0.3 (+0.15 / -0.05)
0.3 (+0.15 / -0.05)
Air gap (a max.)
[mm]
0.7
0.7
0.9
0.9
Holding torque
[Nm]
4
7
12
22.5
Screw tightening torque
[Nm]
3
3
6
6
Table 3-3 Air gap
3.2.3 Brake system
The spring-loaded brake is a solenoid-operated, single disc brake with two friction surfaces. The braking force is applied by springs.
The braking torque is generated when no current is applied. The brake release is solenoid-operated. The brake operates with DC
current. The brake must be able to hold the nominal load in power free mode without any problems.
The brake coil voltage must be the same as the operating voltage.
The brake has no air gap adjustment. If the maximum air gap is reached (a max., table 3-3 and figure 3-1) reached, the
lining and the brake disc must be replaced.
