30 kw electric bus high voltage coolant heater

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30 kW electric bus high voltage coolant heater

 

 

 

Model	NF HVH-Q30
Rated voltage	600V
Voltage range	450-750V
Rated power	30KW
Flow(L/h)	＞3000
Control signal	CAN
Protection level	IP67
Weight	10.5kg
Mounting dimension	162*305mm

 Inlet and outlet size

The WPTC electric heater consists of a PTC heating element, a controller, and internal piping. The heating element is installed in an integrated brazing water tank, and the coolant flows through a high-precision manifold within the tank to achieve heat absorption and circulation.

 

The controller circuit board is fixed to the injection-molded housing with screws, and a connector directly connects to the circuit board. Its electrical schematic diagram is shown in Figure 1 below:

 

The control unit samples the current and voltage of the high-voltage circuit through shunt resistors and sampling resistors to achieve abnormal operation protection.

 

A transient voltage suppressor (TVS) is installed at the low-voltage power input to effectively prevent surges. A high-frequency isolation transformer provides auxiliary power on the high-voltage side. The high and low voltage control units communicate and exchange information through a digital isolator. The input auxiliary power supply has current-limiting protection. Temperature sensors NCT_A and NTC_B, located at the inlet and outlet respectively, are used to monitor the coolant temperature in real time and provide timely protection when the temperature is too high.

 

 

 

Figure 5 below shows the pin definitions for high and low voltage plug-ins.

 

High voltage plug-in model: PL082X-61-6

Wire harness end plug-in model: PL182X-61-6

 

 

 

Low voltage plug-in model: 6188-6227

Low voltage harness model: 6189-7608

HV	1	DC600V+
	2	DC600-
	A	High voltage interlock
	B	High voltage interlock
LV	1	DC24+
	2	DC24-
	3	High voltage interlock
	4	High voltage interlock
	5
	6
	7	CAN-H
	8	CAN-L

 

 

 

PTC Safety Principle:

 

The inherent characteristics of a PTC element dictate that as temperature increases, resistance increases, automatically reducing the achievable heating power. This ensures that even in worst-case scenarios, the system's maximum temperature is limited to within the tolerance range of the surrounding environment.

 

Insulation Fault Detection (Vehicle):

 

The customer must connect the grounding screw to the vehicle frame.

An insulation detection device needs to be installed on the vehicle to detect insulation faults.

 

 

 

 

 

 

 

 

 

 

 

 

 

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