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HUAWEI TECHNOLOGIES CO., LTD.
SmartPSB2000L Smart PV Safety Box
Quick Guide
Issue: 03
Part Number: 31509508
Date: 2018-05-18
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1
Overview
1
• The information in this document is subject to change due to version upgrades or other reasons. Every effort
has been made in the preparation of this document to ensure accuracy of the contents, but all statements,
information, and recommendations in this document do not constitute a warranty of any kind, express or implied.
• Only qualified and trained electrical technicians are allowed to operate the device.
• Carefully read this document and the precautions before installing the device. Failure to comply with the
storage, installation, and operation regulations specified in this document may cause device damage, which is
not covered by Huawei's warranty.
• If the equipment is used in a manner not specified by the manufacturer, the protection provided by the
equipment may be impaired.
• Use insulated tools when installing the device. For personal safety, wear proper personal protective equipment
(PPE).
The SmartPSB2000L smart PV safety box (safety box for short) is a key component that implements rapid
shutdown and module monitoring for Huawei SUN2000P-375W smart PV optimizers. The safety box is easy to
install, operate, and maintain.
Shutdown button
Rapid shutdown means that the power generation system consisting
of optimizers, smart PV safety boxes, and inverters decreases the DC
voltage to the safe voltage range (≤ 30 V) within the specified period
(≤ 30s).
Two routes of output terminals, cable length (including terminals) 250 mm
An LED indicator showing the running status of the safety box
Two routes of input terminals, cable length (including terminals) 150 mm
RS485 communication, PE, and 12 V power cables, 340 mm long
Copyright © Huawei Technologies Co., Ltd. 2018. All rights
reserved.
An optimizer is installed for each PV module, and
the rapid shutdown function of the safety box is
enabled.
box enters the rapid shutdown state. The LED
indicator is steady red, and the inverter turns off the
AC output. This product cannot be used as a
substitute for the emergency stop switch.
) is released, the safety
box exits the rapid shutdown state. The LED
indicator is steady red within 10 minutes. The output
voltages of the optimizer and inverter are restored
10 minutes later. The LED indicator of the safety box
changes from steady red to steady green.
If the AC power fails, the safety enters the rapid
shutdown state. The inverter and optimizer stop
output and communication. The LED indicators of
the safety box and inverter are off.
If the AC power resumes, the inverter, optimizer,
and safety box restore to the normal state.
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2
Installation Mode 2
(Recommended Distance)
2
Installation and Cable Connections
Wiring Diagram
1. Each input of the safety box supports serial connection of
up to 15 optimizers, and the string voltage should be less
than 600 V DC.
2. After the cord end terminal is removed, the PE cable of the
safety box and the communication PE cable of the power
meter can be connected together to the communication
terminal (pin 8) of the inverter.
1. Install the safety box under or on a side of an
inverter with the delivered M6x60 expansion
bolts. It is recommended that an M8 drill bit
be used to drill holes. The torque should be
4.5–5.5 N·m.
2. Connect the RS485 communications, PE,
and 12 V power cables from the safety box to
the corresponding port on the inverter.
3. Connect the output terminals of the safety
box to the DC input ports of the inverter (one
route is used as an example in the right
figure).
4. Connect the input terminals of the safety box
to the output ports of the optimizer string
(one route is used as an example in the right
figure).
Inverter
Safety box Optimizer PV module
Installation Mode 1
(Recommended Distance)
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3
Port Inverter Model
COM SUN2000L-3KTL-CN, SUN2000L-4KTL-CN, SUN2000L-5KTL-CN
ALARM
SUN2000L-2KTL, SUN2000L-3KTL, SUN2000L-3.68KTL, SUN2000L-4KTL, SUN2000L-
4.6KTL, SUN2000L-5KTL
Depending on the inverter model, the RS485 communications, PE, and 12 V power cables need to be
connected to the COM or ALARM port of the inverter. The pins are wired in the same way.
COM or ALARM Terminal Connection
1. Switch on the AC circuit breaker between the inverter and the power grid (the AC voltage of the power grid
should be in the range allowed by the inverter).
2. Turn the DC switch at the bottom of the inverter to the ON position.
3. Observe the LED indicator on the safety box. The status change sequence should be: blinking green at long
intervals > blinking green at short intervals. If the LED indicator is abnormal, check whether cables are
connected correctly and securely.
3
Powering On the Safety Box
Blinking green at long intervals
Blinking green at short intervals
Communicating with the inverter properly and not communicating with the
optimizer.
Communicating with the inverter and optimizer properly.
Blinking green at long intervals: on for 1s and then off for 1s
Blinking green at short intervals: on for 0.2s and then off for 0.2s
1. Check whether all cables to the safety box are properly connected.
2. Input and output terminals are correctly paired, and no crossover exists.