U-Line UCBF632-SS12A User Guide & Service Manual

USER GUIDE
Troubleshooting
Depending on the unit’s voltage rating, each load is directly
connected to either L1 or Neutral. L2 is switched by the
dedicated relay.
Checking Relay Outputs
When a component is not running, determine if the related
relay output is working properly. The relays should cut in
and o according to the logic sequences of the controller
(see Figure 13). To check an output, disconnect the input
line to the relay and the output wire (e.g., to check K10,
disconnect both wires on 19 and 20 terminals). Ohm out
the relay terminals and check if the contact is closed when
the relay is activated. Replace the board when a faulty
relay stays open or becomes shorted.
Transformer
L1 L2
POWER
SUPPLY
Load10
K8
K7
Load2
Load4
Load6
Load9
K9
K10
Load1
Load3
Load5
Load8
Load7
K6
K1
K2
K3
K4
K5
Line
1
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
26
25
24
23
22
Figure 13: Relay Outputs Diagram
KEYPAD – STANDARD CONTROLLER
The RS485(1) port on the relay board is used to connect
the keyboard (see Figure 14).
Connection on Relay Board Connection on Keyboard
RS485(1)
Figure 14: Port Connecting Relay Board to Keyboard
Keypad Troubleshooting
Problems with the Keypad may include:
Ground Connection Missing Display ashes and dims
Negative (-) connection missing Display may work without specic
alarm
Positive (+) connection missing Error Code “Err” is displayed
12V Connection missing Display does not light.
Keypad faulty All connections are present but
display does not work.
MAIN BOARD – TOUCH SCREEN CONTROLLER
Each unit is equipped with a Main Board where the
electrical components are connected. The board has
9 outputs (8 relays plus one PWM output for evaporator
variable speed). The relays control various components.
RELAY RELATED COMPONENT
U1-N COMPRESSOR CONTACTOR COIL
U2-N THAWING
U3-N DEFROST
U4-N THAWING
U5-N NONE
U6-N PUMP DOWN VALVE
U7-N DOOR FRAME HEATER
U8-N CONDENSER FAN
PWM EVAPORATOR FAN
Checking Relay Outputs
The Touch Screen Controller is able to show actual state of
relays through I/O menu (see Figure 15).
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U-Line UCBF632-SS12A Specifications

General

Brand	U-Line
Model	UCBF632-SS12A
Category	Freezer
Language	English