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IM05805022K
Instruction Booklet
Page
16
Effective: January 2012
ATC-300+ Automatic
Transfer Switch Controller
Emergency Inhibit
This input is located on Pins 7 and 8 of Connector J8. The con-
tact is closed for normal operation. Opening this contact will
activate the Emergency Inhibit input.
If the Emergency Inhibit contact is opened when the load is con-
nected to the Normal Source, no action will be taken if the Normal
Source is available. If the Normal Source is not available, an imme-
diate transfer to the neutral position will occur.
If the Emergency Inhibit contact is opened when the load is con-
nected to the Emergency Source, the ATC-300+ will transfer the
load to the Normal Source if it is available. If the Normal Source is
not available, an immediate transfer to the neutral position will
occur.
The Emergency Inhibit input takes priority over the Go To Emer-
gency input if both inputs are activated at the same time. In this
case, the generator will start but a transfer to the Emergency
Source will be inhibited until the Emergency Inhibit input is de-
activated.
5.5 Output Relay
The primary control outputs of the ATC-300+ Controller are dry
relay contacts. These relays are comprised of one latching “Form
A” relay to provide the generator start contacts, and six conven-
tional coil “Form C” relays (four of which implement only the Form
A contact) necessary to complete the electrical control function.
Since the outputs were tested per the UL 1008 Dielectric Test, the
dielectric rating for each output is a minimum of 1500 Vac. The
output relays are pulsed to eliminate error caused by software
“races” between Lockout and Source 1 or Source 2 Closed inputs.
The latched coil relay is UL/CSA rated at 5 A, 1/6 HP, 250 Vac.
The DC rating is 5 A, 30 Vdc, with a 150 W maximum load. The
remaining conventional relays are UL/CSA rated at 10 A, 1/3 HP,
250 Vac. The DC rating is 10 A at 30 Vdc.
Note:
The ATC-300+ Controller MUST BE properly grounded at J-5, Pin
12 for proper operation.
The Output Relay functions are divided into two categories:
•
Customer Connections and
•
Transfer Operation Contacts.
5.5.1 Output Relay Descriptions
Specifically the relay functions are as follows.
5.5.1.1 Customer Connections
THE ATC-300+ CONTROLLER MUST BE PROPERLY GROUNDED AT
J-5, PIN 12 FOR PROPER OPERATION.
CAUTION
