4 minute read
Major hydraulic components ....................................5
Fig. 27, continued: Shuttle car distribution box
Ground fault monitor (3) Circuit breaker (3)
Fuse (2) (10A 120V) 950 - 120VAC transformer
Bus bar (3)
ground fault monitor
“EMERGENCY STOP”
“120 VOLTS CONTROL FUSE”
circuit breakers
120V GFCI receptacle and circuit breaker
A ground fault monitor is located in each 995V circuit. The ground fault monitors for ground fault leakage current in the circuit. If a ground fault is connected, the circuit will trip, removing power from that circuit. There is a ground test function for each ground fault monitor
When activated, the “EMERGENCY STOP” button will trip the pilot in the trailing cable. If the “EMERGENCY STOP” is activated, all power is removed from the machine and must be reset at the power center.
The “120 VOLTS CONTROL FUSE” is connected to both the 120V and the 995V circuits. If this fuse is blown, the 995V circuit breakers cannot be set (turned on).
A thermal-magnetic trip 225A circuit breaker with a trip range of 300 to 650A and 120V UVR (under voltage release) is located in each of the three 995V circuits. Turning the circuit breaker to the “ON” position will energize the shuttle car receptacle. Do not turn the circuit breaker to the “ON” position if the 120V fuse is blown.
CAUTION! Do not set the circuit breaker if the 120V fuse is blown. Internal damage to the circuit may occur.
The 120V GFCI (ground fault circuit interrupter) outlet is located on the right side of the box. The 120V receptacle is energized by setting the single pole, 15A circuit breaker located below the receptacle.
Fig. 28: Starter enclosure Starter enclosure
The starter enclosure, located on the right side of the machine, houses the primary electrical control components.
WARNING! Before removing the cover from the starter enclosure and attempting any maintenance or troubleshooting on the machine, the main power must be disconnected and locked and tagged out at the main power center.
There are operational controls located on the front of the starter enclosure (Fig. 28). For control descriptions, see the Controls and Indicators section in this chapter.
“OFF/MAN/ AUTO” “TRAM/OFF/ CONV” “FWD/OFF/ REV” “LIGHTS ON/OFF” PLC controls and display panel
“15 AMP CB RESET “ACKNOWLEDGE ALARMS” “START BREAKER” “START CONV/PUMP” “PICK BRK/ CONV STOP” “E. STOP” Circuit breaker reset lever
circuit breaker
In addition to the switches and the display panel, there is a 15A circuit breaker for control power mounted on the back side of the cover panel.
Fig. 29: Swing panel (typical) Swing panel
The swing panel (Fig. 29) is accessed by opening the cover on the enclosure. Located on the swing panel are: indicator lights, relays, timers, and a circuit breaker reset.
Immediately adjacent to the swing panel is the main circuit breaker, CB1, for the feeder breaker.
Note that component locations are typical. Always consult the parts book for your machine to verify locations.
PLC power supply Analog input module Analog input module Analog output module Digital input module Digital input module Digital output module Amplifier board #1 Amplifier board #2 IS relay
Resistor Power supply 1 Power supply 2 Power supply 3 “SR” “MCR” “CRWS” “CR1” “CR2” “CRR” Current transducer TAC monitor TAC monitor Fuse, 10A Fuse, 10A
PLC power supply The PLC power supply provides power for the PLC control system.
analog input modules
analog output module
amplifier boards
digital input modules
digital output modules
IS relay
TAC monitors
current transducer
“SR”
“MCR”
“CRWS”
“CR1”
“CR2”
“CRR”
resistor
fuses
There are two analog input modules that receive inputs from the current transducers.
The analog output module sends a signal to the amplifier boards.
The electronic amplifier boards drive the conveyor speed solenoids.
There are two digital input modules that communicate the positions of the selector switches, sequence switch, and auxiliary contactors to the PLC.
The digital out module communicates with the coils and relays based upon input to the two digital input modules.
The IS relay is the intrinsically safe relay for the three tape switches (panic strips).
The TAC monitors pickup the conveyor shaft and pick break speeds and send a signal to the PLC.
The current transducer monitors the pick break motor amps.
There are six relays located on the panel:
“SR” is the safety relay for the tape switches (panic strips).
“MCR” is the master control relay.
“CRWS” is the water solenoid relay.
“CR1” is the conveyor forward relay.
“CR2” is the tram relay.
“CRR” is the conveyor reverse relay.
The 33 KΩ, 1/2W resistor works in conjunction with the safety relay, “SR” to close the circuit so the machine can be started.
The two 10A fuses are for the lighting circuit. Once fuse is for the hot side and one is for the neutral side.
