88242361-04-01 Vol 1 DEK TQ TECHNICAL REFERENCE (1).pdfPDFA.pdf - 第66页
5 POWER SUPPLY 5.3 POWER SUPPLY ENCLOSURE 66 TECHNICAL REFERENCE MANUAL DEK TQ 04/2021 E Stop Blanking Plug E Stop Button Safety Inputs 0V 0V E Stop Supply (from Machine Control) System Button 24V Supply 48V Supply 48V O…
5 POWER SUPPLY
5.3 POWER SUPPLY ENCLOSURE
TECHNICAL REFERENCE MANUAL DEK TQ 04/2021 65
5.3.2 Safety Circuit
The power supply enclosure incorporates the following machine safety circuit:
●
E Stop
●
Cover Safety
In the event of the E Stop loop being broken, all power is disconnected from the motors and some
pneumatic solenoids preventing any moving parts within the machine.
The E Stop button supplies the safety relay with 24 volts. With the E Stop button released, 24 volts
is supplied to the E Stop relay (RL1) coil. This allows the E Stop relay to be reset, provided all cov-
ers are closed, by pressing the system button. With the E Stop relay engaged, 24 volts is supplied
to activate contactors Con 1 and Con 2. Con 1 and 2 supply 48 and 24 volts for the motors.
Relay (RL 2) which is activated by the E Stop relay logic output, has two functions:
1. In the event of the 48 volt power supply shutting down due to a voltage spike, RL 2 resets the
PSU once the E Stop and system buttons are pressed.
2. In the event of an E Stop action, RL 2 shuts down the 48 volt PSU causing the voltage to
ramp down rapidly. This reduces arcing on the contacts in Con 1 and Con 2.
For added safety, the 48 volts is fed through two sets of contacts in Con 1 and one set in Con 2.
This ensures, in the event of welded contacts, the supply to the powerful motors does terminate
during an E Stop condition.
5 POWER SUPPLY
5.3 POWER SUPPLY ENCLOSURE
66 TECHNICAL REFERENCE MANUAL DEK TQ 04/2021
E Stop
Blanking Plug
E Stop
Button
Safety
Inputs
0V
0V
E Stop Supply
(from Machine
Control)
System Button
24V Supply
48V Supply
48V Out
24V SW
24V
Supply
CB4
Power
Distribution
PCB
Main
Cover Switch
Single Cover
Blanking Plug
E Stop
Relay
(RL 1)
Relay
(RL 2)
Con 1 Con 2
Reset
0V0V
PSU 2
Simplified Safety Circuit
5 POWER SUPPLY
5.4 POWER MONITORING
TECHNICAL REFERENCE MANUAL DEK TQ 04/2021 67
5.4 POWER MONITORING
The PSU monitoring board is a stand-off PCB of the power distribution PCB in the power supply
enclosure.
2
1
PSU's Removed For Clarity
1 Power Distribution PCB 2 PSU Monitor Board