PAGE 17 12-5-97 CHAPTER 2: INSTALLATION
2.6
Manual Override Connections
2.6.1
Two modes of operation are provided (manual/automatic) which are controllable by a set
of contacts on the Option card. Automatic mode allows control of the Inverter over the network.
Manual mode provides local control of the Inverter through the terminal board and keypad. The
contacts provided on the printed circuit assembly come in the form of a 2-screw terminal block
(P2), which is shown below. When the contacts are open, the HE300DNT100 is in manual mode.
When the contacts are closed, the HE300DNT100 is in automatic mode. Horner APG, LLC.
recommends using a twisted pair with shield for the contact wires. The ground included
with the twisted pair may be connected to earth ground. As an added precaution against noise
and faulty operation, Horner APG, LLC. recommends using a capacitor directly across the
screw terminals to reduce noise. A capacitor in the range of 0.1uF should be sufficient.
Figure 2-8. Location of Manual Override connection location.
12
3456
V-
C-
SHD
C+
V+
2-screw
terminal block
(P2)
