User's Manual

22 Revision 2 GM550 v1043 FCC-IC.doc
Step 4. Loosen the wing nut of the bracket arm to adjust display orientation to facilitate viewing
by the operator and then tighten it back up.
Power Supply and Lockout Connection
Step 1. Connect the black wire (ground) to the negative terminal of the crane battery or the
panel connection; alternatively bolt the black wire to the body of the machine with a ¼ inch or
5/16 inch bolt. The ground connection must be strong enough to sustain 3 Amp.
Step 2. Connect the red wire to a fused accessory source, rated at least 3 Amps, that supplies
+12 or +24 volts when the crane is on. The GS550 will automatically detect the voltage level
and adjust itself.
Step 3. Lockout number 1 (if required): connect the white wire to a Bosch relay coil. Connect
the other terminal of the relay to the ground. When operating properly the white wire will
energize at the battery positive level. Troubleshooting; if no voltage is present on the white wire
remove the load connected to the lockout. Current over 1.5 Amps on the white wire triggers an
auto re-settable fuse. Current flow will resume several seconds after the short circuit is
eliminated.
Figure: The power cable requires about 4 ½
in. behind the display to protect the connector