Polychem GP44, Operation And Maintenance Manual

Page: 26 / 105

GP44 Semi-Automatic Strapping Machine
OPERATION - 26-
Grip Lead End of Strap
On GP machine, timing is critical since the cycle starts from the home position and the right gripper must grip
the lead end of the strap before the initial retraction occurs. On MR machines, timing is not critical as the
cycle starts fro the grip position. When the strapping cycle is initiated, the strap is already gripped.
Symptom Cause Solution GP
Strap is pulling out
from gripper Right gripper is not
shimmed properly and is
not sufficiently gripping
the strap Check to make sure the Seal Anvil is not bent
or cracked. Check compression pad for
maximum compression. Shim grippers per
procedure.
X
Strap is pulling out
from gripper Retraction is occurring
before the right gripper
extends Check to make sure cam is stopping in the
home position. Check to make sure there is
not a delay in cam motor starting. This
includes the PLC output, relay, and motor. In
some cases on older machines a timer can be
added to the PLC program to delay the start of
the retraction.
X
Strap is
damaged/cut by the
left gripper Right gripper is not
shimmed properly and is
applying too much
pressure to the strap Inspect plunger and solenoid for dirt, pitting, or
other obstructions
X