Greer Company
Greer Company
Greer Company
Greer Company
Crane Systems
1918 EAST GLENWOOD PLACE, SANTA ANA, CA 92705
Tel: (714) 259 9702 Fax: (714) 259 7626
MicroGuard
424 Operation/Troubleshooting Manual Horizontal Display Hydraulic Cranes
41 of 52
W424103 REV A 02/13/01
ANTI TWO BLOCK SYSTEM
ANTI TWO BLOCK SYSTEM
ANTI TWO BLOCK SYSTEM
ANTI TWO BLOCK SYSTEM
SYSTEM WILL NOT SHOW
SYSTEM WILL NOT SHOW
SYSTEM WILL NOT SHOW
SYSTEM WILL NOT SHOW TWO
TWO
TWO
TWO----BLOCK WHEN
BLOCK WHEN
BLOCK WHEN
BLOCK WHEN
CRANE IS TWO
CRANE IS TWO
CRANE IS TWO
CRANE IS TWO----BLOCKED
BLOCKED
BLOCKED
BLOCKED:
1.
Access the Termination Board (refer to
page 33
of
this manual).
2. Make certain that the Anti Two-Block weight is
attached to the boom head switch and that the
selector switch is properly positioned.
3. Remove the brown wire connected to the ATBIN
terminal of the digital input group (see page 42). The
system should show a Two-Block warning.
4. Connect a jumper wire from the 0 volt terminal to the
ATBIN terminal (seepage 42). The Two-Block
warning should no longer be displayed. If the Two-
Block warning remains the problem is in the
Termination Board.
5. Remove the jumper wire and reconnect the brown
wire to the ATBIN in terminal. Remove the four cover
screws from the extension reel located on the left
side of the main boom and remove the cover.
6. Remove the brown wire from the terminal strip. The
system should show a Two-Block warning. If it does
not, the brown wire or its connections between the
Terminal Board and the extension reel are grounded.
If the system does show a Two-Block warning there
is a ground in the wiring or connections between the
extension reel and the Switch at the boom head.
Check all wires and connections between these two
components and repair or replace as required.
SYSTEM SHOWS TWO
SYSTEM SHOWS TWO
SYSTEM SHOWS TWO
SYSTEM SHOWS TWO----BLO
BLO
BLO
BLOCK WHEN CRANE
CK WHEN CRANE
CK WHEN CRANE
CK WHEN CRANE
IS NOT TWO
IS NOT TWO
IS NOT TWO
IS NOT TWO----BLOCKED
BLOCKED
BLOCKED
BLOCKED
1.
Check that the selection switch of the Two-Block
switch located at the main boom head is correctly
set.
2. Make certain that the Anti Two-Block weight is
attached to the boom head switch.
3. Access the Termination Board.
(Refer to
page 33
of this manual).
4. Remove the brown wire connected to ATB in
terminal of the digital input group. The system should
show a Two-Block warning.
5. Connect a jumper wire from the 0 volt terminal to the
ATBIN terminal. The Two-Block warning should no
longer be displayed. If the Two-Block warning
remains the problem is in the Termination Board
assembly. If not, the problem is in the external wiring
or switches.
6. Remove the jumper wire and reconnect the brown
wire to ATB in terminal. Remove the four screws
from the extension reel located on the left side of the
main boom.
7. Connect a jumper wire between the black wire and
the brown wire on the terminal strip. The Two-Block
warning should no longer be displayed. If it remains,
the brown wire is open between the Termination
Board and the Extension Reel. If the warning is no
longer displayed the problem is somewhere between
the extension reel and the boom head switch. Check
all wires and connections between these two
components and repair or replace as required.
BRO W N
A 2B SIG N A L
BLA C K
0V O LT
REELIN G D RU M TERM IN A L
STRIP
