Manitowoc Grove GRT8120, Operator'S Manual

Page: 85 / 448

Grove
Published 3-22-2021, Control # 702-02
3-11
GRT8120 OPERATOR MANUAL OPERATING CONTROLS AND FEATURES
3
Push and release bottom of rocker switch to bypass the
following limiter systems and their crane function lockouts:
• Anti-Two-Block System (boom up/down, telescope out,
hoist up)
• 3rd Wrap Limiter System (hoist down)
The following indicators come on to indicate the limiters are
bypassed:
• Anti-Two-Block Indicator (7, Figure 3-6) is flashing
• 3rd Wrap Alert (Figure 4-68) is flashing
When the bottom of the rocker switch is pushed and
released, all crane functions—boom up/down, telescope
out/in, hoist up/down, and swing left/right—will operate at
50% of normal speed when actuated.
Push and release top of rocker switch to bypass the following
limiter systems and their crane function lockouts:
• RCL System (boom up/down, telescope out, hoist up)
• Working Range Limiter (WRL) system
• Carrier Avoidance System
If RCL is programmed and active and the top of the limit
bypass rocker switch is pushed and released, the swing
left/right function pressure is reduced to 25% and the boom
up/down, hoist up/down, and telescope extend/retract
function speeds are reduced to 15% when actuated. If the
load exceeds 110% of the indicated capacity, all craning
functions will lock out.
The following indicators come on to indicate the limiters are
bypassed:
• Bypass 1 Pressed Indicator (Figure 4-206) is on
• RCL Bypass Active Indicator (Figure 4-206) is on
• RCL Shutdown Warning Indicator (5, Figure 3-6) is
flashing
• Working Range Limiter (WRL) Indicator (Figure 4-71) is
on
• Low Boom Angle Alert (Figure 4-68) is flashing
If RCL has not been programmed and the top of the limit
bypass rocker switch is pushed and released, the swing
left/right, boom up/down, hoist up/down, and telescope
extend/retract functions operate at normal speeds when
actuated.
The following indicators come on to indicate the limiters are
bypassed:
• Bypass 1 Pressed Indicator (Figure 4-206) is on RCL
Bypass Active Indicator (Figure 4-206) is on
• RCL Shutdown Warning Indicator (5, Figure 3-6) is
flashing
• Working Range Limiter (WRL) Indicator (Figure 4-71) is
on
• Low Boom Angle Alert (Figure 4-68) is flashing
All craning functions locked out are bypassed until one of the
following occurs:
• Top of the Limit Bypass Switch is again pushed and
released while the controllers are in the neutral position
• Controllers are in the neutral position for 10 seconds
Boom Up Bypass Switch
The Boom Up Bypass Switch (14, Figure 3-3) is a
two-position momentary rocker switch that is located on the
right overhead control panel.
While boom lift function is enabled and in an RCL lockout
condition, push and release the Boom Up Bypass Switch to
enable boom lift up.
The following indicators come on to indicate the limiter is
bypassed:
• Bypass 2 Pressed Indicator (Figure 4-206) is on
constant (only when switch is pushed)
• RCL Bypass Active Indicator (Figure 4-206) is on
constant
• RCL Shutdown Warning Indicator (5, Figure 3-6) is on
constant when crane capacity is greater than 100%
For CE certified cranes only, the speed of the boom up
function is reduced by 50% when actuated. For non-CE
Certified cranes, the boom up function operates at normal
speed when actuated.
The boom up function lockout is bypassed until one of the
following occurs:
• Boom Up Bypass Switch is again pushed and released
while controllers are in neutral position
• Boom up controller is in neutral position for 10 seconds,
and load is greater than 90% crane capacity and less
than or equal to 100% crane capacity
• Load is reduced to less than 90% of crane capacity