Grove Published 3-25-2020, Control # 595-10 3-11
GRT8100 OPERATOR MANUAL OPERATING CONTROLS AND PROCEDURES
Turn key switch clockwise and hold to bypass the following
limiter systems and their craning function lockouts:
• Anti-two block system (boom up/down, telescope
extend, hoist up)
• Third wrap limiter system (hoist down)
The following indicators illuminate to indicate the limiters are
bypassed:
• Third wrap indicator is flashing
• Anti-2-Block indicator is flashing
Turn key switch counterclockwise
and hold to bypass the
following limiter systems and their craning function lockouts:
• RCL system (boom up/down, telescope extend, hoist
up)
• Anti-two block system (boom up/down, telescope
extend, hoist up)
• Third wrap limiter system (hoist down)
• Working range limiter (WRL) system
• Carrier avoidance system
• -29°C temperature limiter system (optional)
The following indicators illuminate to indicate the limiters are
bypassed:
• Bypass 1 Pressed indicator is on
• RCL Bypass Active indicator is on
• RCL Bypass Status indicator is on
• RCL Lockout LED is flashing
• Third wrap indicator is flashing
• Working range limiter (WRL) indicator is flashing
• Carrier avoidance indicator is flashing
• -29°C temperature limiter indicator is flashing
All craning functions locked out are bypassed while the Limit
Bypass switch is held in the actuated position.
Limit Bypass Switch (CE Certified Cranes)
The Rated Capacity Limiter (RCL) system, when
programmed accurately, will lockout the following crane
functions—boom up/down, telescope extend, and hoist up—
when a lift is attempted at or above the crane's capacity, or
when a two-block condition exists. Locking out these
functions prevents the overload or two-block condition from
worsening. These same craning functions are locked out
initially when starting the crane and before the RCL system
has been programmed.
The Limit Bypass Switch (19) (Figure 3-6) is a three-position,
momentary type key switch. In an emergency situation only,
turn switch clockwise or counterclockwise to bypass the
different limiter systems on the crane.
Turn key switch clockwise
and release to bypass the
following limiter systems and their craning function lockouts:
• Anti-two block system (boom up/down, telescope
extend, hoist up)
• Third wrap limiter system (hoist down)
The following indicators illuminate to indicate the limiters are
bypassed:
• Third wrap indicator is flashing
• Anti-2-Block indicator is flashing
When switch is turned clockwise and released, all crane
functions—boom up/down, telescope extend/retract, hoist
up/down, and swing left/right—will operate at 50% of there
normal speeds when actuated.
Turn key switch counterclockwise
and release to bypass the
following limiter systems and their craning function lockouts:
• RCL system (boom up/down, telescope extend, hoist
up)
• Working range limiter (WRL) system
• Carrier avoidance system
• -29°C temperature limiter system (optional)
If the RCL is programmed and active and the limit bypass
switch is turned counterclockwise and released, the swing
left/right function speed is reduced to 25% and the boom
up/down, hoist up/down, and telescope extend/retract
function speeds are reduced to 15% of rated function speed
when actuated. If load exceeds 110% of crane’s capacity, all
craning functions will lock out. The following indicators
illuminate to indicate the limiters are bypassed:
• Bypass 1 Pressed indicator is on (only when in the
counterclockwise position)
• Bypass 1 Active indicator is on
• RCL Bypass Active indicator is on
• RCL Bypass Status indicator is on
WARNING
Loss of RCL Monitoring Hazard!
The Limit Bypass Switch is to be used to override the RCL
system in emergency situations only.
Do not operate the crane with the RCL overridden during
normal operations.
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