PowerTech MP3749 User Manual

11
INSTALLATION:
CAUTION
• The wire size is only for reference. Suppose a long-distance
exists between the PV array and the controller or between
the controller and the battery. In that case, larger wires shall
be used to reduce the voltage drop and improve the system
performance.
• The recommended wire for the battery is that its terminals
are not connected to any additional inverter.
DRY CONTACT INSTRUCTION
Dry contact parameter
Rated Value: 5A/30VDC
Maximum Value: 0.5A/60VDC
1. Control the utility/generator ON/OFF via the (Utility/Generator)
dry contact
Utility/Generator start-up Voltage (VON) = Under Voltage Warning Voltage
Utility/Generator stop Voltage (VOFF) = Under Voltage Warning Recover Voltage
Battery Voltage (VBAT)
+ Start-up the Utility/Generator: VBAT < VON.
+ Stop the Utility/Generator: VBAT > VOFF.
CAUTION
• Before start or stop the Utility/Generator via the (Utility/
Generator) dry contact, you shall set the switch to the ON
position.
• The VON and VOFF can be set via the PC software. The Battery
Control Voltage Parameters refer to Operation - Settings.
2. Control the load first disconnection and second disconnection.
Battery Voltage (VBAT)
Under Voltage Warning Voltage (VUVW)
Under Voltage Warning Recover Voltage (VUVWR)
Low Voltage Disconnect Voltage (VLVD)
Low Voltage Reconnect Voltage (VLVR)
+ (Utility/Generator) dry contact OFF interface
VBAT ≤ VUVW: The (Utility/Generator) dry contact OFF interface controls
the load ❶ first disconnection.
VBAT ≥ VUVWR: (Utility/Generator) dry contact OFF interface controls the
load ❶ first connection.

PowerTech MP3749 Specifications

General

Brand	PowerTech
Model	MP3749
Category	Controller
Language	English