HT instruments PVCHECK - Manual (Page 43)

PVCHECK
EN - 41
6.4.3. Measuring insulation – TIMER mode
1. Position the cursor onto M
 by using the arrow keys
(
,) and confirm with ENTER. The display shows the
screen to the side.
2. Press the ENTER key, activate “Settings” and possibly
change the desired parameters (see § 5.4). The following
parameters are shown on the display:
 Ins. Test  selected test voltage (250, 500 or
1000VDC)
 Ri min  minimum limit threshold for insulation
measurement
 Mode  measuring mode: TIMER
 Vtest  real applied test voltage
 Ri (+)  minimum insulation resistance between the
Positive pole and the earthing detected during the
whole duration of measurement.
 Test time  test duration which can be set within a
range of 10
 300s
  key  access to the second page with the
measured values of VPN, VEP and VEN voltages
15/05/12 15:34:26
I n s . T e s t : 1 0 0 0 V
R i m i n : 1 . 0 M

M o d e : T i m e r
V t e s t - - - V
R i ( + ) - - - M

T e s t t i m e : 1 0 s
Selection M
 
3. Connect the instrument to the PV module/string being tested and then to possible
unearthed metal masses and to the main earth node of the system (see Fig. 11). In
particular, connect the positive output pole of the PV module/string and the metal
masses to terminal P.
CAPTION:
E: Green
cable
P: Red cable
N: Black cable
1. Unearthed PV
module/string
2. Main system
earthing
3. Massa metallica
non collegata a
terraUnearthed
metal mass
Fig. 11: Instrument connection for insulation measurement in TIMER mode
CAUTION
Upon pressing the GO/STOP key, different error messages can be displayed
by the instrument (see § 6.6) and, therefore, the test cannot be started. Check
and eliminate, if possible, the problem causing the error message before going
on with the test.