Opening the electrical enclosure
Installation
3-34
Part 1120277_01
E 2012 Nordson Corporation
Installing Melter Inputs
PURBlue 4 melters are equipped with two standard digital inputs. Each input
is customer-wired to the melter and then set up to provide one of the
following control options:
S Place the melter into the standby mode
S Turn the heaters on and off
S Enable or disable a specific hose or gun
S Turn the motor on and off
The inputs require a 10 to 30 VDC signal voltage. The inputs are not
polarity-sensitive.
NOTE: Additional input/outputs are available through an optional I/O
expansion card kit. Refer to Optional Equipment in Section 7, Parts.
WARNING! The operator can override the melter inputs by using the control
panel function keys. Ensure that the control logic for any external device that
sends an input signal to the melter is programmed to prevent the creation of
an unsafe condition in the event that the operator overrides an external i nput
to the melter.
To wire digital inputs to the melter
1. Route a 2-, 4-, 6-, or 8-conductor signal cable from the control equipment
to the melter and through the PG-16 penetration on the back of the
electrical enclosure. Use rigid or flexible conduit or a suitable strain relief
to protect the cable from the sharp edge of the conduit penetration.
NOTE: Use a signal cable suitable for NEC class 1 remote control and
signaling circuits. To reduce the possibility of electrical shorting, route the
cablesothatitdoesnottouchnearbycircuitboards.
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