DRM: demand response mode.
DRM is provided to give a remote control with the optional accessory. The
remote control function provides a contact signal to operate the inverter. The
pin definition and the circuit connection show as below.
1. Choose at least 1mm
²
wire. Trip the insulation from the wire ends.
2. Insert the tripped wire into the hole of the terminal block.
3. Screw down the screws on the terminal block.
DRM
E.F.Alarm (optional)
Communication
Connection steps
1
8
Pin
Definition
1
2
3
4
5
6
7
8
DRM1
DRM2
DRM3
DRM4
3.3V
DRM0
GND
GND
3. About 10 seconds later, the system will be updated automatically. During this
period, green light “a” is always been on and red light “b” is unlit. Indicator light “c”,
”d”, “e”, “f” show the progress of system updating. Refer to figure , it represents
Ⅱ
the updating is half-finished.
4. Once system updating has been finished completely, light “a” “c” “d” “e” “f” are all
being on, as shown in figure
.
Ⅲ
b
c
f
d
e
a
（Ⅰ）
（Ⅱ）
（Ⅲ）
24
25
E.F.Alarm means Earth Fault Alarm. It is the additional detection for functionally
earthed PV arrays, as required by AS 4777.2 and AS/NZS 5033.
a) Measure the resistance to earth of each conductor of the PV array.
b)
If the earth resistance is above the resistance limit(R limit) threshold 30KΩ , the
iso
system shall reconnect the functional earth and shall be allowed to start.
c) If the earth resistance is equal to or less than the resistance limit(R limit) threshold
iso
30KΩ , the inverter shall shut down and initiate an earth fault alarm in accordance with
the requirements of IEC 62109-2.
Direct functional earthing of system is not recommended.
Functional earthing via a resisitor is a safer option.
Note !
During updating, don’t switch off the DC switch or cut off the
external dc breaker!
If the updating process is paused for more than 3 minutes,
please reinsert the USB flash drive.
Note !
The updating process for ARM needs about 5 seconds and DSP needs about 3
minutes.
